JP2730310B2 - Backlight for panel - Google Patents
Backlight for panelInfo
- Publication number
- JP2730310B2 JP2730310B2 JP3078695A JP7869591A JP2730310B2 JP 2730310 B2 JP2730310 B2 JP 2730310B2 JP 3078695 A JP3078695 A JP 3078695A JP 7869591 A JP7869591 A JP 7869591A JP 2730310 B2 JP2730310 B2 JP 2730310B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- reflector
- light source
- 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】本発明は、透過型又は、半透過型
パネルを背面より照射するパネル用バックライトに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a panel backlight for irradiating a transmissive or transflective panel from the back.
【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に
は、図１に示すように透光性の導光板の一端部に、蛍光
管のような線状光源を併設するエッジライト方式がよく
用いられる。このエッジライト方式の場合、図２に示す
ように、導光板の一方の面にこの導光板材料よりも屈折
率が大きい光拡散物質を部分的に被覆し、その面のほぼ
全面を鏡面反射板又は光拡散反射板で覆うように配置さ
れたものが多い。2. Description of the Related Art Recently, a liquid crystal display device having a thin and easy-to-see backlight mechanism has been used as a display device such as a laptop or book type word processor or computer. As such a backlight, an edge light system in which a linear light source such as a fluorescent tube is provided at one end of a light-transmitting light guide plate as shown in FIG. 1 is often used. In the case of this edge light method, as shown in FIG. 2, one surface of the light guide plate is partially coated with a light diffusing substance having a higher refractive index than that of the light guide plate material, and almost the entire surface is mirror-reflected. Alternatively, many are arranged so as to be covered with a light diffusion reflector.
【０００３】特に近時、バックライトがバッテリー駆動
されるようになり消費電力−輝度変換効率のより一層の
向上が望まれているため、線状光源を覆う光反射器に、
光拡散反射率の高い光拡散反射板、又は、鏡面反射率の
高い鏡面反射板を配することが提案されている。[0003] In particular, recently, since the backlight is driven by a battery and further improvement in power consumption-luminance conversion efficiency is desired, a light reflector covering the linear light source is required.
It has been proposed to provide a light diffuse reflector having a high light diffuse reflectivity or a specular reflector having a high specular reflectivity.
【０００４】しかし、前記したいづれの方法において
も、消費電力−輝度変換効率は向上するものの、未だ充
分でなく、更により一層の向上が望まれている。However, in any of the above-mentioned methods, although the power consumption-luminance conversion efficiency is improved, it is still insufficient, and further improvement is desired.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、上述の点に
つき種々の検討を行った結果、エッジライト方式のバッ
クライトにおいて、ある構造の反射器で覆った線状光源
を用いると、前記した消費電力−輝度変換効率の高いバ
ックライトとなることを見出した。即ち本発明は、透光
性材料からなる導光板の少なくとも一側面端部に、これ
に近接した線状光源を有し、その線状光源を覆う反射器
が、反射器の側から中心部に位置する線状光源に向かっ
て、光拡散反射板又は光拡散反射フィルム、空気層、鏡
面反射板又は鏡面反射フィルムの順に積層したものを用
い、前記導光板の一方の面に該導光板材料よりも屈折率
が大きい光拡散物質を部分的に被覆し、その面を鏡面な
いし光拡散反射板で覆ったパネル用バックライトに関す
るものである。According to the present invention, as a result of various studies on the above points, it has been found that a linear light source covered with a reflector having a certain structure is used in an edge light type backlight. It has been found that the backlight has high power consumption-luminance conversion efficiency. That is, the present invention has a linear light source adjacent to at least one side end of a light guide plate made of a translucent material, and the reflector covering the linear light source is located at the center from the reflector side. Toward the located linear light source, using a light diffusion reflection plate or light diffusion reflection film, an air layer, a mirror reflection plate or a mirror reflection film laminated in this order, from the light guide plate material on one surface of the light guide plate Also, the present invention relates to a panel backlight in which a light-diffusing substance having a large refractive index is partially covered and its surface is covered with a mirror surface or a light-diffusing reflector.
【０００６】次に本発明を図面に基づいて更に詳述す
る。Next, the present invention will be described in more detail with reference to the drawings.
【０００７】図１は、本発明の一実施態様の斜視図であ
り、図２は、同断面図である。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。２は光拡散板で、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る。本発明では、この光
拡散板を一枚又は複数枚用いる。FIG. 1 is a perspective view of an embodiment of the present invention, and FIG. 2 is a sectional view of the embodiment. 1 is a light guide plate in the figure,
Any substance can be used as long as the substance allows light to pass therethrough efficiently, such as quartz, glass, or a translucent natural or synthetic resin such as an acrylic resin. Reference numeral 2 denotes a light diffusing plate that scatters light emitted from the light guide plate and allows the light to pass therethrough. In the present invention, one or more light diffusion plates are used.
【０００８】導光板２に施す光散乱物質９は、導光板の
材質に比較して高屈折率を持ち、かつ拡散反射率が大き
い顔料を含んだ塗料、印刷インキ等である。これらをス
クリ−ン印刷等の方法で導光板面上にドット状に印刷す
る。鏡面ないし光拡散反射板３は光散乱物質を被覆した
導光板の面のほぼ全面を覆うように配置する。４は線状
光源で、好ましい態様としては、導光板の端部に光が入
光するための間隙（スリット）を有する反射器５で、光
源面とある幅の間隙をもたせた状態で覆われており、導
光板の少なくとも一端面部に近接してその中心軸が導光
板の端面とほぼ平行となるように設置される。The light scattering substance 9 applied to the light guide plate 2 is a paint, a printing ink or the like containing a pigment having a higher refractive index than the material of the light guide plate and having a large diffuse reflectance. These are printed in dot form on the light guide plate surface by a method such as screen printing. The mirror surface or the light diffusion reflection plate 3 is arranged so as to cover almost the entire surface of the light guide plate coated with the light scattering substance. Reference numeral 4 denotes a linear light source. In a preferred embodiment, a reflector 5 having a gap (slit) for allowing light to enter the end of the light guide plate is covered with a gap having a certain width from the light source surface. The light guide plate is installed so as to be close to at least one end face of the light guide plate so that its central axis is substantially parallel to the end face of the light guide plate.
【０００９】本発明はこの線状光源を覆う反射器に特徴
がある。即ち、導光板の端面部と相対して間隙（スリッ
ト）を持つ反射器５の内側の面から、光拡散反射板又は
光拡散反射フィルム（図中６）を配し、その面から、空
気層を介して、鏡面反射板又は鏡面反射フィルム（図中
７）を配したことである。ここで光拡散反射板又は光拡
散反射フィルム層と鏡面反射板又は鏡面反射フィルム層
は、全面が密着した状態でなければ良く前記両層の少な
くとも一部、又は全部の層で空気層が存在する状態であ
れば良い。この際の空気層の厚さは、特に制限されない
が、バックライトを構成する構造上３ｍｍ以下で、最小
の厚さは少なくとも単分子層の空気が存在する程度の間
隔で良い。The present invention is characterized by a reflector that covers the linear light source. That is, from the surface of the inner side of the reflector 5 and the end face portion relative to the light guide plate having a gap (slit), a light diffuse reflector or a light diffuse reflection film (figure 6) arranged, from the surface, air That is, a specular reflection plate or a specular reflection film (7 in the figure) was disposed via the layers. Here, the light diffusion reflection plate or the light diffusion reflection film layer and the specular reflection plate or the specular reflection film layer need not be in a state where the entire surface is in close contact with each other, and at least a part of the both layers, or an air layer exists in all the layers. Any condition is acceptable. At this time, the thickness of the air layer is not particularly limited, but is not more than 3 mm due to the structure of the backlight, and the minimum thickness may be at least as long as the air of the monolayer exists.
【００１０】又、前記鏡面反射板又は鏡面反射フィルム
の材質は、光を鏡面反射させるものであれば良く、銀、
アルミニウム、白金、ニッケル、クロム、金、銅等から
なる材質で、好ましくはポエステルなどのプラスチック
フィルム基材に銀、アルミニウム等を蒸着又はスパッタ
リングにより表面コートしたものである。The material of the specular reflection plate or the specular reflection film may be any material that reflects light specularly.
A material made of aluminum, platinum, nickel, chromium, gold, copper, or the like, preferably a plastic film substrate such as polyester, which is coated with silver, aluminum, or the like by vapor deposition or sputtering.
【００１１】前記線状光源４は、蛍光管、タングステン
白熱管、オプティカルロッド、ＬＥＤを配列した物等が
あるが、蛍光管が好ましく、省電力の面から、電極部を
除く均一発光部の長さが、近接する導光板の端部の長さ
と等しいことが好ましい。The linear light source 4 includes a fluorescent tube, a tungsten incandescent tube, an optical rod, an LED array, and the like, but a fluorescent tube is preferable. Is preferably equal to the length of the end of the adjacent light guide plate.
【００１２】本発明の主要部は、このような構成からな
り、パネル、特に液晶パネルのバックライトとして使用
される。本発明では、更に以下に示すような構成とする
ことが好ましい。 １）本発明の導光板に施す光拡散物質は、ドット状即ち
点状に形成するものであるが、このドットの形状は特に
制限されるものでなく、円形、角形、交差線で形成され
たいづれでもよい。これらは導光板上に仮想される一定
の間隔を持った直交線の交点（グリッド）上に施される
が、直交線の間隔は０．５〜３ｍｍ更に好ましくは０．
８〜２ｍｍの間で導光板の厚さに応じて適宜選択され
る。The main part of the present invention has such a structure and is used as a backlight of a panel, especially a liquid crystal panel. In the present invention, it is preferable to adopt the following configuration. 1) The light diffusing substance applied to the light guide plate of the present invention is formed in a dot shape, that is, a dot shape. However, the shape of the dot is not particularly limited, and is formed in a circle, a square, or an intersection line. Either is acceptable. These are applied on intersections (grids) of orthogonal lines having a certain interval imagined on the light guide plate, and the interval between the orthogonal lines is preferably 0.5 to 3 mm, and more preferably 0.5 to 3 mm.
It is appropriately selected between 8 and 2 mm according to the thickness of the light guide plate.
【００１３】更に、前記光拡散物質の被覆状態は、導光
板面上で線状光源部近傍で被覆率が１％〜５０％、光源
から最遠部で２０％〜１００％であることが好ましく、
光源からの距離が大となるにつれて、光源から線状光源
を近接させた一側面端部の被覆点から始めて被覆率が順
次大となるように被覆することが好ましい。尚、ここで
言う被覆率とは、導光板面の単位面積当たりに施した光
散乱物質の被覆面積の割合を言う。 ２）本発明では、更に好ましくは、前記した光散乱物質
の被覆率（Ｙ）の増加は、線状光源から各グリッド上の
光散乱物質までの距離（Ｘ）に対して１．７〜３．５次
の範囲に入るように増加する、即ち、Ｙを縦軸に、Ｘを
横軸にした場合、Ｙ＝ａＸ１．７で示される線とＹ＝ａ
Ｘ３．５（ここでａは導光板面の端部の被覆率から求め
られる値で、０＜ａ≦２である）で示される線との間に
入る値で増加すること、又は、Ｙ＝ａｘ（ａは前記した
と同じようにして求められる値で、１＜ａ≦２である）
の関係で増加することである。 ３）更に、本発明では、発光面上で、線状光源の軸と平
行となる状態のグリッド上に被覆される光散乱物質の被
覆率（Ｙ´）が、その平行線上の中央（即ち、線状光源
の長手方向の中央から線状光源に垂直に立てた導光板面
上の線から両端に向かう方向の光拡散物質までの距離
（Ｘ´）に対して、順次大となるように被覆することが
好ましい。Further, it is preferable that the light diffusing material is coated on the light guide plate at a coverage of 1% to 50% in the vicinity of the linear light source portion and 20% to 100% in a portion farthest from the light source. ,
As the distance from the light source increases, it is preferable to cover the linear light source from the light source such that the coverage gradually increases starting from the coating point on one side end where the linear light source is brought closer. Here, the covering ratio means a ratio of a covering area of the light scattering substance applied per unit area of the light guide plate surface. 2) In the present invention, more preferably, the increase in the light scattering material coverage (Y) is 1.7 to 3 with respect to the distance (X) from the linear light source to the light scattering material on each grid. increases .5 to fall following ranges, namely, the vertical axis Y, when the X in the horizontal axis, the lines and Y = a represented by Y = aX 1.7
X 3.5 (where a is a value obtained from the coverage of the end portion of the light guide plate surface and 0 <a ≦ 2), or Y is increased. = A x (a is a value obtained in the same manner as described above and 1 <a ≦ 2)
The relationship is to increase. 3) Further, in the present invention, the coverage (Y ′) of the light-scattering substance coated on the grid in a state parallel to the axis of the linear light source on the light-emitting surface is determined at the center on the parallel line (ie, at the center). Coated so that the distance (X ') from the line on the light guide plate surface perpendicular to the linear light source to the light diffusing material in the direction toward both ends from the center in the longitudinal direction of the linear light source increases in order. Is preferred.
【００１４】本発明は、光拡散板の上面に液晶パネルな
どの光表示パネルを設置して使用される。The present invention is used by installing an optical display panel such as a liquid crystal panel on the upper surface of a light diffusion plate.
【００１５】[0015]
【発明の効果】本発明は比較的小型で、充分な輝度を得
られ、消費電力−輝度変換効率が大なバックライトとし
て使用できる。The present invention can be used as a backlight having a relatively small size, sufficient luminance, and a large power consumption-luminance conversion efficiency.
【００１６】[0016]
【実施例】次に比較例及び実施例で本発明を更に詳述す
る。まず比較例として次の方法で試験した。図１に示す
ような厚さ２ｍｍの長方形導光板（２２５ｍｍ×１２７
ｍｍ）の短手の端部に、その端部長より７ｍｍ長い直径
４．１ｍｍの太さの冷陰極蛍光管（ハリソン電機株式会
社製径４．１ｍｍノ−マル管）を配置し、その管の外周
を２ｍｍの隙間をおいて、導光板に接する部分に２ｍｍ
のスリットを持つ、筒型アルミ反射器で覆い、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光するよ
うに配置した。この反射器内面には光拡散反射フィルム
（株式会社辻本電機製作所ＭＴＮ−Ｗ２００）を配置し
た。Next, the present invention will be described in more detail with reference to Comparative Examples and Examples. First, a comparative example was tested by the following method. As shown in FIG. 1, a rectangular light guide plate having a thickness of 2 mm (225 mm × 127
mm), a cold cathode fluorescent tube (4.1 mm diameter normal tube manufactured by Harrison Electric Co., Ltd.) having a diameter of 4.1 mm, which is 7 mm longer than the length of the end, is disposed at the short end of the tube. With a gap of 2 mm on the outer circumference, 2 mm
The light guide plate was covered with a cylindrical aluminum reflector having a slit, and the light emitted from the slit was arranged to enter the light guide plate from an end of the light guide plate. A light diffusion reflection film (MTN-W200, Tsujimoto Electric Co., Ltd.) was disposed on the inner surface of the reflector.
【００１７】一方、導光板面上に被覆する光拡散物質
は、円形のドットパタ−ンをスクリ−ン印刷したもので
あり、スクリ−ン版下は、ＣＡＤにより下記の条件で作
成して用いた。光拡散物質の被覆率が、Ｘ値の最小の地
点（即ち図３ａ点付近）で６％、最大の地点（即ち図３
ｄ点付近）で８０％、その中間ではこれらの比率がａｘ
に比例した値となるように作図した。On the other hand, the light diffusing substance to be coated on the surface of the light guide plate is obtained by screen-printing a circular dot pattern, and the screen plate is prepared and used by CAD under the following conditions. . The coverage of the light diffusing substance is 6% at the point where the X value is minimum (that is, near the point in FIG. 3A), and is the maximum point (that is, FIG.
80% at around point d), and in the middle, these ratios are a x
The plot was made so that the value was proportional to.
【００１８】又、線状光源と平行に配置されるＸ´の方
向には、Ｘが０から導光板長手端面のほぼ中間まで（即
ち図中ｂ点）の間が、Ｘ´＝０（即ちａ〜ｂ間の各点）
及びＸ´の最大（即ちｃ〜ｂ´間の各点）の被覆率を基
準に、Ｘ´値の３乗に比例した変化率で決定される被覆
率となるように作図した。図３上のｃ点の被覆率は、導
光板の厚さ、大きさ、冷陰極管の種類により１％〜５０
％の間で任意に選ばれる値であり、本例では１０％とし
た。Further, in the direction of X 'arranged parallel to the linear light source, X' = 0 (that is, X '= 0 to the middle of the longitudinal end face of the light guide plate (that is, point b in the drawing)). each point between a and b)
Based on the maximum coverage of X ′ and X ′ (that is, each point between c and b ′), the plotting is performed so that the coverage is determined by a change rate proportional to the cube of the X ′ value. The coverage at the point c in FIG. 3 is 1% to 50% depending on the thickness and size of the light guide plate and the type of the cold cathode fluorescent lamp.
%, Which is arbitrarily selected, and is set to 10% in this example.
【００１９】冷陰極管に、インバ−タより３０ＫＨｚの
交番電圧をかけて一定電流で駆動させたときの面輝度
を、輝度計（トプコンＢＭ−８）により測定した結果、
その平均値は２１９（比較例１）であった。又拡散反射
フィルム（図２の６）を鏡面反射フィルム（中井工業株
式会社製Ａｇ高反射フィルム）とした以外は上記例と同
様の装置、条件で操作し輝度を測定した結果、その平均
値は２２８（比較例２）であった。As a result of measuring the surface luminance when a constant current was applied to the cold cathode tube by applying an alternating voltage of 30 KHz from the inverter with a luminance meter (Topcon BM-8),
The average value was 219 (Comparative Example 1). The luminance was measured using the same apparatus and under the same conditions as in the above example except that the diffuse reflection film (6 in FIG. 2) was a specular reflection film (Ag high reflection film manufactured by Nakai Kogyo Co., Ltd.). 228 (Comparative Example 2).
【００２０】又、反射器（図２の５）最外側に、比較例
１で用いた光拡散反射フィルムを用い、その内面に比較
例２で用いた鏡面反射フィルムを全面密着させて用いた
以外は上記例と同様の装置、条件で操作し輝度を測定し
た結果、その平均値は２３０（比較例３）であった。
又、比較例３において、光拡散反射フィルムと鏡面反射
フィルムを約０．３ｍｍの空気層（図２の８）を持つよ
うに配置して用いた以外は上記例と同様の装置、条件で
操作し輝度を測定した結果、その平均値は２７０（実施
例）であった。尚、輝度の平均値（ｃｄ／ｍ２）は、導
光板上の発光面に仮想される等間隔の直交線の交点であ
る６０の測定点の輝度を平均したものである。In addition, the light diffusing reflection film used in Comparative Example 1 was used on the outermost side of the reflector (5 in FIG. 2), and the specular reflection film used in Comparative Example 2 was completely adhered to the inner surface. Was operated under the same apparatus and conditions as in the above example, and the luminance was measured. As a result, the average value was 230 (Comparative Example 3).
Further, in Comparative Example 3, operation was carried out under the same apparatus and conditions as in the above example, except that the light diffusion reflection film and the specular reflection film were arranged so as to have an air layer (8 in FIG. 2) of about 0.3 mm. As a result of measuring the luminance, the average value was 270 (Example). The average value of the luminance (cd / m 2 ) is the average of the luminance at 60 measurement points, which are the intersections of equally spaced orthogonal lines imagined on the light emitting surface on the light guide plate.
【図１】本発明の一実施態様のバックライトの斜視図FIG. 1 is a perspective view of a backlight according to an embodiment of the present invention.
【図２】本発明の一実施態様のバックライトの断面図FIG. 2 is a cross-sectional view of a backlight according to an embodiment of the present invention.
【図３】導光板に塗布した光散乱物質の分布状態を示す
図FIG. 3 is a view showing a distribution state of a light scattering substance applied to a light guide plate.
１：導光板 ２：光拡散板 ３：鏡面反射板又は光拡散射板板 ４：線状光源 ５：反射器 ６：光拡散反射フィルム又は板 ７：鏡面反射フィルム又は板 ８：空気層 ９：光散乱物質 1: light guide plate 2: light diffusion plate 3: specular reflection plate or light diffusion projection plate 4: linear light source 5: reflector 6: light diffusion reflection film or plate 7: specular reflection film or plate 8: air layer 9: Light scattering material
Claims (1)
側面端部に、これに近接した線状光源を有し、その線状
光源を覆う反射器が、反射器の内面側から中心部に位置
する線状光源に向かって、光拡散反射板又は光拡散反射
フィルム、空気層、鏡面反射板又は鏡面反射フィルムの
順に積層したものであり、前記導光板の一方の面に該導
光板材料よりも屈折率が大きい光拡散物質を部分的に被
覆し、その面を鏡面ないし光拡散反射板で覆ったパネル
用バックライト。At least one side end of a light guide plate made of a translucent material has a linear light source adjacent to the light guide plate, and a reflector covering the linear light source is located at a central portion from the inner surface side of the reflector. A light diffusion reflection plate or a light diffusion reflection film, an air layer, a specular reflection plate or a specular reflection film are laminated in this order toward the linear light source located in the position, and the light guide plate material is formed on one surface of the light guide plate. A backlight for a panel in which a light-diffusing substance having a higher refractive index is partially covered and its surface is covered with a mirror surface or a light-diffusing reflector.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3078695A JP2730310B2 (en) | 1991-02-21 | 1991-02-21 | Backlight for panel |
| US07/838,337 US5262928A (en) | 1991-02-21 | 1992-02-20 | Back lighting device |
| EP92102820A EP0500089B1 (en) | 1991-02-21 | 1992-02-20 | Back lighting device |
| DE69212662T DE69212662T2 (en) | 1991-02-21 | 1992-02-20 | Backlighting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3078695A JP2730310B2 (en) | 1991-02-21 | 1991-02-21 | Backlight for panel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04267222A JPH04267222A (en) | 1992-09-22 |
| JP2730310B2 true JP2730310B2 (en) | 1998-03-25 |
Family
ID=13669006
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3078695A Expired - Fee Related JP2730310B2 (en) | 1991-02-21 | 1991-02-21 | Backlight for panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2730310B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6164789A (en) * | 1996-07-12 | 2000-12-26 | Honeywell International Inc. | Illumination sources and systems |
| US8520164B2 (en) | 2007-07-27 | 2013-08-27 | Sharp Kabushiki Kaisha | Illumination device, display device, and light guide plate |
| CN101680636B (en) | 2007-07-27 | 2011-12-07 | 夏普株式会社 | Illuminating device, and liquid crystal display device |
| CN101688658B (en) * | 2007-07-27 | 2012-02-01 | 夏普株式会社 | Lighting device and display device |
-
1991
- 1991-02-21 JP JP3078695A patent/JP2730310B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04267222A (en) | 1992-09-22 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |