JP3300488B2 - L-shaped line light source type surface emitting device - Google Patents
L-shaped line light source type surface emitting deviceInfo
- Publication number
- JP3300488B2 JP3300488B2 JP20262393A JP20262393A JP3300488B2 JP 3300488 B2 JP3300488 B2 JP 3300488B2 JP 20262393 A JP20262393 A JP 20262393A JP 20262393 A JP20262393 A JP 20262393A JP 3300488 B2 JP3300488 B2 JP 3300488B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- guide plate
- light guide
- emitting device
- 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.)
- Expired - Fee Related
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、高輝度で消費電力が
少なく、輝度ムラの生じにくいＬ字状線光源型面発光装
置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an L-shaped line light source type surface light-emitting device having high luminance, low power consumption, and less occurrence of luminance unevenness.
【０００２】[0002]
【従来の技術】従来、液晶パネルのバックライトなどに
用いられる薄型のエッジライト方式の面発光装置とし
て、導光板の一側面に真直ぐな線光源を配置し、導光板
の裏面に光拡散透過部を設け、真直ぐな線光源を配置し
た側面に対向する他側面に側面反射板を配置したものが
ある。光拡散透過部は、線光源の配置された側面から離
れるにつれてその面積率が大きくなり、同じ面積率の部
分が線光源の配置された側面に平行な直線状に存在する
ように設けられる。この光拡散透過部によって、線光源
から導光板に入った光は導光板の表面より均一に出光さ
れる。2. Description of the Related Art Conventionally, as a thin edge light type surface light emitting device used for a backlight of a liquid crystal panel, etc., a straight line light source is arranged on one side surface of a light guide plate, and a light diffusion transmitting portion is provided on the back surface of the light guide plate. And a side reflection plate is disposed on the other side opposite to the side on which the straight line light source is disposed. The light diffusion transmitting portion has an area ratio that increases as the distance from the side surface on which the line light source is disposed, and is provided such that a portion having the same area ratio exists in a straight line parallel to the side surface on which the line light source is disposed. The light that has entered the light guide plate from the linear light source is uniformly emitted from the surface of the light guide plate by the light diffusion transmission portion.
【０００３】しかし、導光板の一側面に真直ぐな線光源
を配置した面発光装置は輝度が低かった。そこで、面発
光装置の輝度を上げるためには、導光板の隣接する二側
面から光を入れる必要がある。その場合、一つの側面に
対して一つの線光源を配置するよりも、導光板の隣接す
る二側面にわたるＬ字状線光源を用いると消費電力が少
なくてすむ。However, a surface light emitting device in which a straight line light source is disposed on one side surface of a light guide plate has low brightness. Therefore, in order to increase the brightness of the surface light emitting device, it is necessary to input light from two adjacent side surfaces of the light guide plate. In such a case, power consumption can be reduced by using an L-shaped line light source extending over two adjacent side surfaces of the light guide plate, compared to arranging one line light source on one side surface.
【０００４】[0004]
【発明が解決しようとする課題】しかし、導光板１の隣
接する二側面にわたるＬ字状線光源２を面発光装置に用
いると、導光板１裏面の光拡散透過部は、線光源の配置
された側面から離れるにつれてその面積率が大きくな
り、同じ面積率の部分が線光源１の配置された側面に平
行な直線状に存在するように設けられるため、図６また
は図７のようになる（図６および図７中、導光板表面に
関した直線および数字は面積率の変化を示す。）。な
お、図６の場合、Ｌ字状線光源３の配置されていない導
光板１の二側面に側面反射板４が配置されているので、
導光板１の側面反射板４側角部より導光板１中央側に存
在する点で線光源の輝度が最も少なくなり、この点にお
ける光拡散透過部の面積率は輝度不足を補うために最大
に設けられる。また、側面反射板４による反射が少ない
場合、光拡散透過部の面積率は導光板１の側面反射板４
側側面の中間位置で最大となる。However, when an L-shaped line light source 2 extending over two adjacent side surfaces of the light guide plate 1 is used in a surface light emitting device, the light diffusion transmitting portion on the back surface of the light guide plate 1 is arranged with the line light source. The area ratio increases as the distance from the side surface increases, and a portion having the same area ratio is provided so as to exist in a straight line parallel to the side surface on which the linear light source 1 is arranged, and thus becomes as shown in FIG. 6 or FIG. In FIGS. 6 and 7, straight lines and numerals relating to the light guide plate surface indicate changes in the area ratio.) In the case of FIG. 6, since the side reflectors 4 are arranged on two sides of the light guide plate 1 where the L-shaped line light source 3 is not arranged,
The brightness of the linear light source is the lowest at a point located on the center side of the light guide plate 1 from the corner of the light guide plate 1 on the side of the side reflector 4, and the area ratio of the light diffusion transmission portion at this point is maximized to compensate for the lack of brightness. Provided. Further, when the reflection by the side reflector 4 is small, the area ratio of the light diffusion / transmission part is smaller than that of the side reflector 4 of the light guide plate 1.
It is maximum at the middle position on the side surface.
【０００５】そのため、光拡散透過部の同じ面積率の部
分が線光源の配置された側面に平行な直線状に存在する
ことになるため、同じ面積率の部分が直角に接するとこ
ろにおいて光の干渉度合いが極端に増し、導光板１の出
光面に光のスジ７が発生する（図８、図９参照）という
問題がある。[0005] Therefore, since the portions having the same area ratio of the light diffusion / transmission portion exist in a straight line parallel to the side surface on which the linear light source is disposed, light interference occurs when the portions having the same area ratio contact at right angles. There is a problem that the degree is extremely increased and light streaks 7 are generated on the light exit surface of the light guide plate 1 (see FIGS. 8 and 9).
【０００６】したがって、本発明は上記のような問題を
解消し、高輝度で消費電力が少なく、輝度ムラが生じに
くいＬ字状線光源型面発光装置を提供することを目的と
する。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an L-shaped line light source type surface light emitting device which solves the above-mentioned problems, has high luminance, consumes little power, and does not easily cause luminance unevenness.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記の目的を
達成するために、透明な導光板の側面に線光源を配置
し、導光板の裏面に光拡散透過部を設けたエッジライト
方式の面発光装置において、線光源が導光板の隣接する
二側面にわたるＬ字状線光源であり、Ｌ字状線光源の配
置されていない導光板の二側面に側面反射板が配置さ
れ、導光板の側面反射板側角部またはこの位置より導光
板中央側に存在する線光源の輝度が最も少なくなる点を
最大としてこの点より離れるにつれて面積率が小さくな
るように光拡散透過部が設けられ、光拡散透過部の同じ
面積率の部分が円周状または円弧状に存在するようにＬ
字状線光源型面発光装置を構成したものである。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an edge light system in which a line light source is disposed on a side surface of a transparent light guide plate, and a light diffusion transmission portion is provided on the back surface of the light guide plate. Wherein the line light source is an L-shaped line light source extending over two adjacent side surfaces of the light guide plate, and the side reflectors are disposed on the two side surfaces of the light guide plate where the L-shaped line light source is not disposed; A light diffusion transmission portion is provided so that the point at which the luminance of the line light source present on the light guide plate center side from the side reflector side corner portion or the position becomes the minimum becomes the maximum and the area ratio decreases as the distance from this point decreases, L so that the portions of the light diffusion transmitting portion having the same area ratio exist in a circular shape or an arc shape.
This constitutes a V-shaped line light source type surface light emitting device.
【０００８】また、本発明は、透明な導光板の側面に線
光源を配置し、導光板の裏面に光拡散透過部を設けたエ
ッジライト方式の面発光装置において、線光源が導光板
の隣接する二側面にわたるＬ字状線光源であり、このＬ
字状線光源が導光板の四側面を囲むように二個配置さ
れ、導光板中央に存在する線光源の輝度が最も少なくな
る点を最大としてこの点より離れるにつれて面積率が小
さくなるように光拡散透過部が設けられ、光拡散透過部
の同じ面積率の部分が円周状または円弧状に存在するよ
うにＬ字状線光源型面発光装置を構成したものである。Further, the present invention provides an edge light type surface light emitting device in which a line light source is disposed on a side surface of a transparent light guide plate and a light diffusion transmission portion is provided on the back surface of the light guide plate. L-shaped line light source extending over two sides
The two linear light sources are arranged so as to surround the four side surfaces of the light guide plate, and the light is arranged such that the point at which the luminance of the line light source located at the center of the light guide plate becomes minimum is maximized, and the area ratio decreases as the distance from this point increases. An L-shaped line light source type surface light emitting device is provided in which a diffusion transmission portion is provided and a portion having the same area ratio of the light diffusion transmission portion exists in a circular shape or an arc shape.
【０００９】また、上記の構成において、光拡散透過部
の面積率を、Ｌ字状線光源の折り曲げ部近傍よりＬ字状
線光源の両端近傍で大きく構成してもよい。In the above configuration, the area ratio of the light diffusion / transmission portion may be configured to be larger near both ends of the L-shaped line light source than near the bent portion of the L-shaped line light source.
【００１０】また、上記の構成において、導光板の光拡
散透過部を形成した裏面に背面反射板が配置されるよう
に構成してもよい。[0010] In the above configuration, a back reflector may be arranged on the back surface of the light guide plate on which the light diffusion / transmission portion is formed.
【００１１】また、上記の構成において、導光板の表面
に光拡散板が配置されるように構成してもよい。In the above configuration, a light diffusing plate may be arranged on the surface of the light guide plate.
【００１２】図面を参照しながら本発明をさらに詳しく
説明する。図１は本発明に係る光拡散透過部の面積率変
化の一実施例を示す平面図、図２は図１のＬ字状線光源
型面発光装置のＡＡ断面図、図３は図１のＬ字状線光源
型面発光装置のＢＢ断面図、図４および図５は本発明に
係る光拡散透過部の面積率変化の他の実施例を示す平面
図である。１は導光板、２はＬ字状線光源、３は光拡散
透過部、４は側面反射板、５は背面反射板、６は光拡散
板をそれぞれ示す。The present invention will be described in more detail with reference to the drawings. FIG. 1 is a plan view showing an embodiment of an area ratio change of a light diffusion / transmission portion according to the present invention, FIG. 2 is a sectional view taken along the line AA of the L-shaped line light source type surface light emitting device of FIG. 1, and FIG. FIG. 4 and FIG. 5 are plan views showing another example of the change in the area ratio of the light diffusion / transmission portion according to the present invention. Reference numeral 1 denotes a light guide plate, 2 denotes an L-shaped line light source, 3 denotes a light diffusion / transmission part, 4 denotes a side reflection plate, 5 denotes a back reflection plate, and 6 denotes a light diffusion plate.
【００１３】導光板１としては、厚さ1〜30mm程度の透
明な長方形板材が好ましい。また、導光板１の側面は平
滑面になるように研磨するのが好ましい。導光板１の材
料としては、アクリル樹脂、ポリカーボネート樹脂、ポ
リ塩化ビニル樹脂などの樹脂やガラスなどを用いるとよ
い。The light guide plate 1 is preferably a transparent rectangular plate having a thickness of about 1 to 30 mm. Further, it is preferable that the side surface of the light guide plate 1 is polished so as to be smooth. As a material of the light guide plate 1, a resin such as an acrylic resin, a polycarbonate resin, or a polyvinyl chloride resin, or glass may be used.
【００１４】一つまたは二つのＬ字状線光源２として
は、熱陰極線管や冷陰極線管など陰極線管を用いる。ま
た、Ｌ字状線光源２の導光板１に面していない部分を覆
うように、湾曲反射板を配置し、その内側の鏡面によっ
てＬ字状線光源２の光を効率よく利用できるようにして
もよい。As one or two L-shaped line light sources 2, a cathode ray tube such as a hot cathode ray tube or a cold cathode ray tube is used. Further, a curved reflecting plate is arranged so as to cover a portion of the L-shaped line light source 2 which does not face the light guide plate 1, so that the light of the L-shaped line light source 2 can be efficiently used by the inner mirror surface. You may.
【００１５】導光板１の裏面には、線光源の輝度が最も
少なくなる点を最大としてこの点より離れるにつれて面
積率が小さくなり、同じ面積率の部分が円周状または円
弧状に存在するように光拡散透過部３が設けられる。側
面反射板４による反射が少ない場合には、光拡散透過部
３の面積率が最大となる点は導光板１の側面反射板４側
角部に存在する（図４参照、導光板表面に関した曲線お
よび数字は面積率の変化を示す。）。また、側面反射板
４による反射が多い場合には、光拡散透過部３の面積率
が最大となる点は側面反射板４側角部より導光板１中央
側に存在する（図１参照、導光板表面に関した曲線およ
び数字は面積率の変化を示す。）。また、Ｌ字状線光源
２が導光板１の四側面を囲むように二個配置される場
合、光拡散透過部３の面積率が最大となる点は導光板１
中央に存在する（図５参照、導光板表面に関した曲線お
よび数字は面積率の変化を示す。）。Ｌ字状線光源２か
ら光拡散透過部３に到達した光は、ここで拡散し、導光
板１の表側に向かったり、導光板１のさらにＬ字状線光
源２から離れた方向など、多方向へ向かう。On the back surface of the light guide plate 1, the area ratio becomes smaller as the point at which the luminance of the line light source becomes the lowest becomes maximum, and the area ratio becomes smaller as the distance from this point increases, so that a portion having the same area ratio exists in a circular shape or an arc shape. Is provided with a light diffusion transmission part 3. When the reflection by the side reflection plate 4 is small, the point at which the area ratio of the light diffusion / transmission portion 3 is maximum exists at the corner of the light guide plate 1 on the side of the side reflection plate 4 (see FIG. 4 regarding the light guide plate surface). Curves and numbers indicate changes in area ratio.) Further, when the reflection by the side reflector 4 is large, the point where the area ratio of the light diffusion / transmission portion 3 is maximum is located closer to the center of the light guide plate 1 than the corner on the side reflector 4 side (see FIG. Curves and numbers related to the light plate surface indicate changes in the area ratio.) When two L-shaped line light sources 2 are arranged so as to surround the four side surfaces of the light guide plate 1, the point at which the area ratio of the light diffusing / transmitting portion 3 is maximized is that
It is present at the center (see FIG. 5, the curve and the number relating to the light guide plate surface indicate a change in the area ratio). The light that has reached the light diffusing and transmitting section 3 from the L-shaped line light source 2 is diffused here and travels to the front side of the light guide plate 1 or further away from the L-shaped line light source 2 of the light guide plate 1. Head in the direction.
【００１６】さらに、光拡散透過部３の面積率を、Ｌ字
状線光源２の折り曲げ部近傍よりＬ字状線光源２の両端
近傍で大きくなるようにすることにより、線光源の両端
部の輝度の低さを補うことができる。Further, by increasing the area ratio of the light diffusion transmission portion 3 near both ends of the L-shaped line light source 2 from near the bent portion of the L-shaped line light source 2, both ends of the line light source 2 can be formed. Low brightness can be compensated for.
【００１７】光拡散透過部３のグラデーションパターン
は、微細で多数のドットにより形成することができる。
光拡散透過部３を形成するドットは、たとえば円形であ
り、印刷の網点の密度を変化させるように、ドットの径
寸法を変えることによって面積率を変化させることがで
きる。光拡散透過部３は円形のドットに限らず、任意の
形状のドットで形成してもよい。また、ドットに限ら
ず、ストライプなどで形成してもよい。光拡散透過部３
は、炭酸カルシウムまたはシリカなどの導光板１の屈折
率とほぼ同じかそれ以下の粒子状透明物質を含有するイ
ンキを用い、グラビア印刷、オフセット印刷、スクリー
ン印刷などの印刷法、あるいは転写法などの手段によっ
て形成するとよい。The gradation pattern of the light diffusion / transmission portion 3 can be formed by a large number of fine dots.
The dots forming the light diffusion transmitting portion 3 are, for example, circular, and the area ratio can be changed by changing the diameter of the dots so as to change the density of the printing halftone dots. The light diffusion transmission part 3 is not limited to circular dots, and may be formed of dots of any shape. Further, it is not limited to dots, and may be formed by stripes or the like. Light diffusion transmission part 3
Is a printing method such as gravure printing, offset printing, screen printing, or a transfer method using an ink containing a particulate transparent substance substantially equal to or less than the refractive index of the light guide plate 1 such as calcium carbonate or silica. It may be formed by means.
【００１８】また、Ｌ字状線光源２が一つの場合、Ｌ字
状線光源２の配置されていない導光板１の側面に側面反
射板４を形成してもよい。側面反射板４としては、(1)
白色ポリエチレンテレフタレートフィルム、(2)白色塗
装あるいは白色印刷したアルミニウム板、(3)鏡面を有
する金属板や金属箔、金属蒸着されたフィルムや板、
(4)白色インキによる塗布層または印刷層、(5)蒸着層、
(6)白色樹脂層などを使用することができる。When there is one L-shaped line light source 2, a side reflector 4 may be formed on the side of the light guide plate 1 where the L-shaped line light source 2 is not disposed. As the side reflector 4, (1)
White polyethylene terephthalate film, (2) white painted or printed aluminum plate, (3) metal plate or metal foil with mirror surface, metal-deposited film or plate,
(4) coating or printing layer with white ink, (5) evaporation layer,
(6) A white resin layer or the like can be used.
【００１９】また、図３に示すように、導光板１の裏面
に背面反射板５を配置してもよい。背面反射板５として
は、(1)白色ポリエチレンテレフタレートフィルム、(2)
白色塗装あるいは白色印刷したアルミニウム板などを使
用することができる。Further, as shown in FIG. 3, a back reflector 5 may be arranged on the back surface of the light guide plate 1. (1) White polyethylene terephthalate film, (2)
A white paint or a white printed aluminum plate can be used.
【００２０】なお、側面反射板４あるいは背面反射板５
は、内面を白色塗料で塗装した面光源装置用ケース（図
示せず）で代用することもできる。The side reflector 4 or the back reflector 5
Can be replaced by a surface light source device case (not shown) whose inner surface is painted with white paint.
【００２１】また、導光板１の表側には、光拡散板６を
密着させないように配置するとよい。光拡散板６として
は、(１)フィルムに光拡散物質が塗布された光拡散フィ
ルム、(2)フィルム自体が拡散性を有するもの、(3)乳白
色の樹脂板などを使用することができる。Further, it is preferable to arrange the light diffusing plate 6 on the front side of the light guide plate 1 so as not to be in close contact. As the light diffusing plate 6, (1) a light diffusing film in which a light diffusing substance is applied to a film, (2) a film having a diffusive property, (3) a milky white resin plate, or the like can be used.
【００２２】[0022]
【作用】本発明のＬ字状線光源型面発光装置は、上記の
ように構成されるので、次の作用を有する。The L-shaped line light source type surface light-emitting device of the present invention has the following operation since it is configured as described above.
【００２３】すなわち、Ｌ字状線光源より透明導光板内
に入った光の一部は、光拡散透過部の設けられていない
箇所で入光角と反射角とが等しく全反射を繰り返し、導
光板の奥へ導かれる。一方、残りの光は、拡散透過部の
設けられている箇所で散乱して直接的に、または導光板
裏面の背面反射板で反射して間接的に導光板の表面側に
導かれる。That is, a part of the light that has entered the transparent light guide plate from the L-shaped line light source repeats total reflection with the same light incident angle and the same reflection angle at a portion where the light diffusion / transmission portion is not provided, and guides the light. Guided to the back of the light plate. On the other hand, the remaining light is scattered at the portion where the diffuse transmission portion is provided, and is directly guided to the front surface side of the light guide plate, or indirectly reflected by the back reflector on the back surface of the light guide plate.
【００２４】このとき、線光源の輝度が最も少なくなる
点から離れた部分では、光拡散透過部の面積率が小さい
ので導光板の表面側に導かれる光は少なく、大部分の光
は導光板の奥へ導かれる。At this time, in a portion distant from the point where the luminance of the linear light source is the lowest, the area ratio of the light diffusion transmitting portion is small, so that the light guided to the surface side of the light guide plate is small, and most of the light is the light guide plate. It is led to the back of.
【００２５】また、線光源の輝度が最も少なくなる点の
付近では、光拡散透過部の面積率が大きいので大部分の
光は導光板の表面側に導かれ、導光板の奥へ導かれる光
は少ない。In the vicinity of the point where the luminance of the linear light source is minimum, most of the light is guided to the front surface side of the light guide plate and the light guided to the back of the light guide plate because the area ratio of the light diffusion and transmission portion is large. Is less.
【００２６】[0026]
【実施例】以下に本発明に係るＬ字状線光源型面発光装
置の実施例を示す。長辺90mm、短辺70mm、厚さ４mmの透
明アクリル板を導光板とし、その隣接する二側面にわた
って、Ｌ字の長辺90mm、Ｌ字の短辺70mm、直径３mmの熱
陰極線管をＬ字状線光源を一つ配置した。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an L-shaped line light source type surface light emitting device according to the present invention will be described below. A transparent acrylic plate with a long side of 90 mm, a short side of 70 mm, and a thickness of 4 mm is used as a light guide plate, and an L-shaped hot cathode ray tube having an L-shaped long side of 90 mm, an L-shaped short side of 70 mm, and a diameter of 3 mm is spread over two adjacent sides. One linear light source was arranged.
【００２７】また、Ｌ字状線光源の配置されていない導
光板の二側面に、側面反射板として白色反射板（東レ株
式会社製E60L）を配置した。A white reflector (E60L manufactured by Toray Industries, Inc.) was disposed as a side reflector on two sides of the light guide plate on which the L-shaped line light source was not disposed.
【００２８】また、導光板の裏面には長辺80mm、短辺60
mmの光拡散透過部を、導光板の側面反射板側角部に存在
する線光源の輝度が最も少なくなる点を最大としてこの
点より離れるにつれて面積率が小さくなり、同じ面積率
の部分が円周状または円弧状に存在するように光散乱性
のインキを用いスクリーン印刷にて設けた。なお、光拡
散透過部の面積率は、最大となる点で80％、Ｌ字状線光
源の折り曲げ部近傍で50％、Ｌ字状線光源の短辺側の端
近傍の面積率で60％、Ｌ字状線光源の長辺側の端近傍の
面積率で70％である。On the back surface of the light guide plate, the long side is 80 mm and the short side is 60 mm.
mm, the area ratio becomes smaller as the point where the luminance of the linear light source present at the side reflector side corner of the light guide plate becomes the minimum becomes maximum, and the area ratio becomes smaller as the distance from this point increases. It was provided by screen printing using a light-scattering ink so as to exist in a circumferential or arc shape. The area ratio of the light diffusion transmitting portion is 80% at the maximum point, 50% near the bent portion of the L-shaped line light source, and 60% at the area ratio near the short side end of the L-shaped line light source. The area ratio near the long side end of the L-shaped line light source is 70%.
【００２９】また、導光板の光拡散透過部を形成した裏
面にも背面反射板として白色反射板（東レ株式会社製E6
0L）を配置し、導光板の表面に光拡散板として光拡散フ
ィルム（株式会社きもと製100SH）を配置した。Further, a white reflector (E6 manufactured by Toray Industries, Inc.) is also provided as a back reflector on the back surface of the light guide plate on which the light diffusion transmitting portion is formed.
0L), and a light diffusion film (Kimoto 100SH) was disposed as a light diffusion plate on the surface of the light guide plate.
【００３０】このような構成のＬ字状線光源型面発光装
置は、4500cd／m2と高輝度でかつ2.4ｗと消費電力が少
なく、輝度の均一度90％と輝度ムラの生じにくいもので
あった。The L-shaped line light source type surface light emitting device having such a configuration has a high luminance of 4500 cd / m 2 , a low power consumption of 2.4 watts, a uniformity of luminance of 90%, and is unlikely to cause luminance unevenness. there were.
【００３１】[0031]
【発明の効果】本発明のＬ字状線光源型面発光装置は、
以上のような構成および作用からなるので、次の効果が
得られる。According to the present invention, an L-shaped line light source type surface light emitting device is provided.
With the above configuration and operation, the following effects can be obtained.
【００３２】すなわち、光拡散透過部の同じ面積率の部
分が円周状または円弧状に存在するため、同じ面積率の
部分が直角に接することがなく、光の干渉度合いが極端
に増して導光板の出光面に光のスジが発生することがな
い。したがって、輝度ムラが生じない均一な輝度の面発
光が得られ、しかも高輝度で低消費電力である。That is, since the portions having the same area ratio of the light diffusion / transmission portion exist in a circular shape or an arc shape, the portions having the same area ratio do not contact at a right angle, and the degree of interference of light is extremely increased. Light streaks do not occur on the light exit surface of the light plate. Accordingly, surface light emission of uniform luminance without luminance unevenness is obtained, and high luminance and low power consumption are obtained.
【図１】本発明に係る光拡散透過部の面積率変化の一実
施例を示す平面図である。FIG. 1 is a plan view showing one embodiment of a change in an area ratio of a light diffusion / transmission portion according to the present invention.
【図２】図１のＬ字状線光源型面発光装置のＡＡ断面図
である。FIG. 2 is an AA cross-sectional view of the L-shaped line light source type surface light emitting device of FIG.
【図３】図１のＬ字状線光源型面発光装置のＢＢ断面図
である。FIG. 3 is a cross-sectional view of the L-shaped line light source type surface light emitting device of FIG.
【図４】本発明に係る光拡散透過部の面積率変化の他の
実施例を示す平面図である。FIG. 4 is a plan view showing another embodiment of a change in the area ratio of the light diffusion / transmission portion according to the present invention.
【図５】本発明に係る光拡散透過部の面積率変化の他の
実施例を示す平面図である。FIG. 5 is a plan view showing another embodiment of the change in the area ratio of the light diffusion transmission portion according to the present invention.
【図６】一個のＬ字状線光源に適用した従来の光拡散透
過部の面積率変化を示す平面図である。FIG. 6 is a plan view showing an area ratio change of a conventional light diffusion / transmission portion applied to one L-shaped line light source.
【図７】二個のＬ字状線光源に適用した従来の光拡散透
過部の面積率変化を示す平面図である。FIG. 7 is a plan view showing a change in area ratio of a conventional light diffusion / transmission portion applied to two L-shaped line light sources.
【図８】図６の光拡散透過部により発生する輝度ムラを
示す平面図である。FIG. 8 is a plan view showing luminance unevenness generated by the light diffusion transmitting unit in FIG. 6;
【図９】図７の光拡散透過部により発生する輝度ムラを
示す平面図である。FIG. 9 is a plan view showing luminance unevenness generated by the light diffusion transmitting unit of FIG. 7;
１ 導光板 ２ Ｌ字状線光源 ３ 光拡散透過部 ４ 側面反射板 ５ 背面反射板 ６ 光拡散板 ７ 光のスジ REFERENCE SIGNS LIST 1 light guide plate 2 L-shaped line light source 3 light diffusion transmitting part 4 side reflection plate 5 back reflection plate 6 light diffusion plate 7 light streak
フロントページの続き (56)参考文献 特開 平６−161363（ＪＰ，Ａ) 特開 平５−34693（ＪＰ，Ａ) 特開 平４−358125（ＪＰ，Ａ) 特開 平４−329520（ＪＰ，Ａ) 特開 平４−268506（ＪＰ，Ａ) 特開 平４−218026（ＪＰ，Ａ) 特開 平１−183626（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02F 1/13357 F21V 8/00 601 Continuation of the front page (56) References JP-A-6-161363 (JP, A) JP-A-5-34693 (JP, A) JP-A-4-358125 (JP, A) JP-A-4-329520 (JP) JP-A-4-268506 (JP, A) JP-A-4-218026 (JP, A) JP-A-1-183626 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB Name) G02F 1/13357 F21V 8/00 601
Claims (5)
導光板の裏面に光拡散透過部を設けたエッジライト方式
の面発光装置において、線光源が導光板の隣接する二側
面にわたるＬ字状線光源であり、Ｌ字状線光源の配置さ
れていない導光板の二側面に側面反射板が配置され、導
光板の側面反射板側角部またはこの位置より導光板中央
側に存在する線光源の輝度が最も少なくなる点を最大と
してこの点より離れるにつれて面積率が小さくなるよう
に光拡散透過部が設けられ、光拡散透過部の同じ面積率
の部分が円周状または円弧状に存在することを特徴とす
るＬ字状線光源型面発光装置。1. A linear light source is arranged on a side surface of a transparent light guide plate,
In the edge light type surface light emitting device provided with a light diffusion transmitting portion on the back surface of the light guide plate, the line light source is an L-shaped line light source extending over two adjacent side surfaces of the light guide plate, and the L-shaped line light source is not disposed. Side reflectors are arranged on the two side surfaces of the light guide plate, and the point where the luminance of the line light source present on the light guide plate center side from the side reflector side corner or the light guide plate center side of the light guide plate is maximized and becomes farther away from this point. An L-shaped line light source type surface light emitting device, wherein a light diffusion transmission portion is provided so as to reduce the area ratio, and portions of the light diffusion transmission portion having the same area ratio exist in a circular shape or an arc shape.
導光板の裏面に光拡散透過部を設けたエッジライト方式
の面発光装置において、線光源が導光板の隣接する二側
面にわたるＬ字状線光源であり、このＬ字状線光源が導
光板の四側面を囲むように二個配置され、導光板中央に
存在する線光源の輝度が最も少なくなる点を最大として
この点より離れるにつれて面積率が小さくなるように光
拡散透過部が設けられ、光拡散透過部の同じ面積率の部
分が円周状または円弧状に存在することを特徴とするＬ
字状線光源型面発光装置。2. A line light source is arranged on a side surface of a transparent light guide plate,
In an edge light type surface light emitting device provided with a light diffusion transmission portion on the back surface of a light guide plate, a line light source is an L-shaped line light source extending over two adjacent side surfaces of the light guide plate, and the L-shaped line light source is a light guide plate. Two light diffusion / transmission portions are provided so as to surround the four side surfaces, and the point at which the luminance of the linear light source located at the center of the light guide plate becomes the minimum is maximized, and the area ratio becomes smaller as the distance from the point increases. L wherein the portions having the same area ratio of the diffusion transmitting portion exist in a circumferential shape or an arc shape.
A linear light source type surface emitting device.
の折り曲げ部近傍よりＬ字状線光源の両端近傍で大きい
請求項１または請求項２のいずれかに記載のＬ字状線光
源型面発光装置。3. The L-shaped light source according to claim 1, wherein an area ratio of the light diffusion transmitting portion is larger near both ends of the L-shaped light source than near a bent portion of the L-shaped light source. Line light source type surface emitting device.
背面反射板が配置された請求項１〜３のいずれかに記載
のＬ字状線光源型面発光装置。4. The L-shaped line light source type surface light emitting device according to claim 1, wherein a back reflector is disposed on a back surface of the light guide plate on which the light diffusion / transmission portion is formed.
求項１〜４のいずれかに記載のＬ字状線光源型面発光装
置。5. The L-shaped line light source type surface light emitting device according to claim 1, wherein a light diffusing plate is disposed on a surface of the light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20262393A JP3300488B2 (en) | 1993-07-23 | 1993-07-23 | L-shaped line light source type surface emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20262393A JP3300488B2 (en) | 1993-07-23 | 1993-07-23 | L-shaped line light source type surface emitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0736039A JPH0736039A (en) | 1995-02-07 |
| JP3300488B2 true JP3300488B2 (en) | 2002-07-08 |
Family
ID=16460436
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20262393A Expired - Fee Related JP3300488B2 (en) | 1993-07-23 | 1993-07-23 | L-shaped line light source type surface emitting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3300488B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100541262B1 (en) * | 1998-08-26 | 2006-04-12 | 삼성전자주식회사 | Backlight assembly |
| KR101197762B1 (en) * | 2005-10-04 | 2012-11-06 | 엘지디스플레이 주식회사 | Back light unit and liquid crystal display including the same |
| JP4648358B2 (en) * | 2007-06-01 | 2011-03-09 | ライツ・アドバンスト・テクノロジー株式会社 | Light guide plate and flat illumination device |
-
1993
- 1993-07-23 JP JP20262393A patent/JP3300488B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0736039A (en) | 1995-02-07 |
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