JPH06300924A - Back light - Google Patents
Back lightInfo
- Publication number
- JPH06300924A JPH06300924A JP5086126A JP8612693A JPH06300924A JP H06300924 A JPH06300924 A JP H06300924A JP 5086126 A JP5086126 A JP 5086126A JP 8612693 A JP8612693 A JP 8612693A JP H06300924 A JPH06300924 A JP H06300924A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- light source
- transmission plate
- 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.)
- Granted
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (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 backlight for a panel which illuminates a transmissive or semi-transmissive panel from the back side.
【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、導光板の一方の広い面に光拡散性物質を部分的
に被覆し、その面のほぼ全面を光拡散反射板又はフィル
ム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 backlight mechanism which is thin and easy to see has been used as a display device for a laptop or book type word processor, a computer or the like. For such a backlight, an edge light system is often used 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. In the case of this edge light method, as shown in FIG. 2, one wide surface of the light guide plate is partially covered with a light diffusing substance, and almost the entire surface is covered with a light diffusing reflector or film. There were many things that were done.
【０００３】特に近時、これらワ−プロ、パソコンのよ
り一層の小型化が望まれており、バックライトに於いて
は、導光板の有効発光部、即ち、導光板面で輝線など異
常発光が視認されることがない、実際に面状発光（照
明）体として本来用いる得る部分を保ちながらバックラ
イトの全体（外形寸法）をいかに小さくするかに多大の
労力が注がれている。Particularly in recent years, further miniaturization of these word processors and personal computers has been desired, and in backlights, abnormal light emission such as bright lines occurs on the effective light emitting portion of the light guide plate, that is, the light guide plate surface. A great deal of effort has been put into how to reduce the overall size (outside dimension) of the backlight while keeping the part that can be actually used as a planar light emitting (illumination) body that is not visually recognized.
【０００４】バックライトの構成は、細部については種
々雑多であるが、いわゆるエッジライト方式のバックラ
イトは、基本的には、上記したように光拡散反射板等を
積層した導光板、それに近接した線状光源などを一体と
してケースに組み込まれており、それらの構成物は振動
などで容易に移動することのないように配置されてい
る。特に導光板はバックライトの基本構成物であり、通
常はストッパーなどを用いて固定されている。The structure of the back light is various in details, but the so-called edge light type back light is basically a light guide plate in which a light diffusion reflection plate and the like are laminated as described above, and is close to the light guide plate. A linear light source and the like are integrally incorporated in the case, and the components thereof are arranged so as not to easily move due to vibration or the like. In particular, the light guide plate is a basic component of a backlight and is usually fixed by using a stopper or the like.
【０００５】図３、４に従来のバックライトの構成物配
置を示したが、図中９が前記したストッパーで、線状光
源（図中４）の近傍にあり導光板（図中１）を固定して
いる。このような構成物配置では、図３に示したように
導光板面の有効発光部（図中７）は、線状光源の軸方向
では導光板面の端縁部まで利用できるが、線状光源が配
置されている側では、導光板の端部に近付けば近付くほ
ど、線状光源直近に発生する輝線（線状光源とほぼ平行
に線の状態で現れる極めて高輝度な部分）から出射する
光線が強く、導光板面の線状光源側の端部からある距離
を隔てた部分以遠の導光板面内部しか有効発光部が利用
できないことになる。FIGS. 3 and 4 show the arrangement of the components of a conventional backlight. Reference numeral 9 in the drawing is the stopper described above, which is located near the linear light source (4 in the drawing) and which has a light guide plate (1 in the drawing). It is fixed. With this arrangement of components, as shown in FIG. 3, the effective light-emitting portion (7 in the figure) on the light guide plate surface can be used up to the edge portion of the light guide plate surface in the axial direction of the linear light source. On the side where the light source is arranged, the closer it gets to the end of the light guide plate, the more it emits from the bright line generated near the linear light source (the extremely high-intensity part that appears in a linear state almost parallel to the linear light source). The light rays are strong, and the effective light emitting portion can be used only inside the light guide plate surface beyond a portion separated from the end of the light guide plate surface on the linear light source side.
【０００６】このような構成では、液晶ディスプレイに
これを用いた場合、そのビュ−エリア（ワ−プロ、パソ
コン等で画面として使用されている光学的窓で、バック
ライトからの光線が透過可能な部分）に対応する有効発
光部を維持しながらバックライトの外形を小さくしよう
とすると必然的に前記した輝線がビューエリア内に視認
される状態となって、均一な発光面が得られない結果と
なり、従来のビューエリアに対応する有効発光部を保持
し外形を小形化バックライトの構成が困難であった。With such a structure, when this is used for a liquid crystal display, the light from the backlight can be transmitted through the viewing area (optical window used as a screen in word processors, personal computers, etc.). Part)), when attempting to reduce the size of the backlight while maintaining the effective light emitting part, the bright lines inevitably become visible in the view area, resulting in the inability to obtain a uniform light emitting surface. However, it has been difficult to form a backlight having a small outer shape while holding an effective light emitting portion corresponding to a conventional view area.
【０００７】[0007]
【発明が解決しようとする課題】本発明の目的は、充分
な有効発光面積を保持し外形を小形化したバックライト
を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a backlight having a small outer shape while maintaining a sufficient effective light emitting area.
【０００８】[0008]
【課題を解決するための手段】本発明者等は、バックラ
イトの線状光源近傍の構造と導光板出光面の輝度分布に
ついて種々の検討を行った結果、サイドライト方式のバ
ックライトに於いて、線状光源側の導光板の端部形状が
ある形状の時に導光板の表面に対して有効発光面積を充
分利用できるバックライトとなることを見出した。Means for Solving the Problems The inventors of the present invention have made various studies on the structure near the linear light source of the backlight and the luminance distribution of the light exit surface of the light guide plate, and as a result, in the sidelight type backlight. It has been found that when the end portion of the light guide plate on the linear light source side has a certain shape, the backlight can sufficiently utilize the effective light emitting area with respect to the surface of the light guide plate.
【０００９】即ち本発明は、透光性材料からなる導光
板、その少なくとも一側面端部に近接した線状光源を持
つバックライトに於いて、線状光源に近接した導光板端
部の少なくとも一箇所に欠削部を持つ導光板を用いたこ
とを特徴とするパネル用バックライトに関するものであ
る。That is, the present invention relates to a light guide plate made of a translucent material, and a backlight having a linear light source close to at least one side surface end thereof, and at least one end of the light guide plate close to the linear light source. The present invention relates to a backlight for a panel, which is characterized by using a light guide plate having a cutout portion at a location.
【００１０】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.
【００１１】本発明の基本的な構成は、図１、図２に示
したものと概略同様である。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。The basic structure of the present invention is substantially the same as that shown in FIGS. 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.
【００１２】導光板１に、側面端部から入射した光線を
導光板の広い面から出射させるには、その面に光拡散機
能を付与することであるが、その付与方法は、光散乱物
質、例えば、ＳｉＯ2、ＢａＳＯ4、ＴｉＯ2等を含んだ
塗料、印刷インキ等をスクリ−ン印刷等の方法で導光板
面上にドット状に印刷するなどして行うか、導光板の表
面を粗面化するか、小孔を開けるか、小突起を付与する
か、導光板そのものに屈折率が異なる物質が分布する状
態にしても良い。[0012] In order to cause the light rays incident from the side end portions to the light guide plate 1 to be emitted from the wide surface of the light guide plate, a light diffusing function should be imparted to the surface. For example, paint or printing ink containing SiO 2 , BaSO 4 , TiO 2 or the like may be printed in dots on the surface of the light guide plate by a method such as screen printing, or the surface of the light guide plate may be roughened. The surface may be planarized, small holes may be formed, small protrusions may be provided, or the light guide plate itself may be in a state in which substances having different refractive indexes are distributed.
【００１３】２は光拡散板で、導光板の出光面から出た
光の指向性の制御、輝度の向上、導光板に付与した光拡
散機能の形状を出光面から見た場合判別できないように
する等々の目的で使用され、表面が粗面か、微細構造を
持つ透過性の板又はフィルムが用いられる。３は鏡面又
は光反射板又は同フィルムで、これらは本発明の好まし
い実施態様として用いられる。Reference numeral 2 denotes a light diffusing plate, which controls the directivity of light emitted from the light exit surface of the light guide plate, improves the brightness, and makes it impossible to determine the shape of the light diffusing function imparted to the light guide plate when viewed from the light exit surface. For example, a transparent plate or film having a rough surface or a fine structure is used. 3 is a mirror surface or a light reflection plate or the same film, and these are used as a preferred embodiment of the present invention.
【００１４】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射するように線状光源の中心軸が
同端面と略平行となるように配置し、線状光源の、導光
板の端部と相対する面以外の表面を光反射板又は同フィ
ルム５で覆う状態で配置することである。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、有効発光面積の輝度分布の均一性の面及び省電力の
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ほぼ等しいことが好ましい。Reference numeral 4 is a linear light source, and in a preferred embodiment,
Arrange the linear light source so that the central axis of the linear light source is substantially parallel to the end face of the light guide plate so that light is incident on the end face of the light guide plate. It is arranged in a state of being covered with the reflection plate or the film 5. 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, and in terms of uniformity of luminance distribution of an effective light emitting area and power saving, It is preferable that the length of the uniform light emitting portion excluding the electrode portion is substantially equal to the length of the end portion of the adjacent light guide plate.
【００１５】本発明では、導光板１の形状が、線状光源
に近接した導光板端部の少なくとも一箇所に欠削部を持
つものを用いることが特徴である。本発明の特徴である
導光板の線状光源側の形状は、例えば図６に示すよう
に、導光板を保持固定するストッパーの部分と導光板と
を重複させることのできる欠削部を持つ構造である。The present invention is characterized in that the light guide plate 1 has a shape having a cutout portion at least at one end of the light guide plate adjacent to the linear light source. The shape of the light guide plate on the linear light source side, which is a feature of the present invention, has a structure in which, as shown in FIG. 6, for example, a stopper portion for holding and fixing the light guide plate and a cutout portion capable of overlapping the light guide plate. Is.
【００１６】図５、６は本発明の一実施態様、即ち、線
状光源の軸方向の両端部近傍で導光板の角部分に欠削部
を持つ例を示した図で、これをもとに本発明を更に詳細
に説明する。図５は出光面側から見た平面図で、図６は
側面から見た斜視図である。本発明を特徴づける導光板
の欠削部は図の８で示す部分で、この部分は図６に示す
ストッパー９と少なくとも一部分重複している。図６で
は前記欠削部とストッパーがほぼ全部分重複組合わさっ
た例を示した。FIGS. 5 and 6 are views showing an embodiment of the present invention, that is, an example in which a cutout portion is provided at a corner portion of the light guide plate in the vicinity of both axial end portions of the linear light source. The present invention will be described in more detail below. 5 is a plan view seen from the light emitting surface side, and FIG. 6 is a perspective view seen from the side. The cutout portion of the light guide plate which characterizes the present invention is a portion shown by 8 in the drawing, and this portion at least partially overlaps with the stopper 9 shown in FIG. FIG. 6 shows an example in which the cutout portion and the stopper are almost entirely overlapped and combined.
【００１７】本発明の導光板の欠削部は図６に示したよ
うに導光板の厚さ部分の全てを欠削する必要はなく、図
７に示したように導光板の厚さ以内であれば良い。図７
はストッパー部分が全て導光板と重複しており、導光板
の厚さのほぼ１／２の厚さの部分で重複した例を示し
た。The cut portion of the light guide plate of the present invention does not need to cut all of the thickness portion of the light guide plate as shown in FIG. 6, and within the thickness of the light guide plate as shown in FIG. I wish I had it. Figure 7
Shows an example in which the stopper portion is entirely overlapped with the light guide plate, and the stopper portion is overlapped with a portion having a thickness of about ½ of the thickness of the light guide plate.
【００１８】前記した欠削部の形状は、導光板の線状光
源側の端部の少なくとも一箇所を、ストッパーの機能を
保持し得る程度に、例えばその厚み幅全体を欠削したも
のか厚み幅より少ない幅で欠削したもので良く、ストッ
パ−が線状光源から導光板への光の入射を妨げてストッ
パ−近傍の入光効率を低下させないように、好ましくは
可能な限り導光板の端部にこれを配置することである
が、導光板が充分固定されれば特にその位置、形状に制
限はない。The shape of the notched portion is such that at least one of the ends of the light guide plate on the side of the linear light source is notched or has the entire thickness width so that the function of the stopper can be maintained. It may be cut out with a width smaller than the width, and it is preferable that the stopper does not interfere with the incidence of light from the linear light source to the light guide plate and reduce the light entering efficiency in the vicinity of the stopper as much as possible. The position and shape of the light guide plate are not particularly limited as long as the light guide plate is sufficiently fixed.
【００１９】導光板をこのような構造とすることによっ
て、輝線を有効発光部から遠ざけて、液晶ディスプレイ
のビュ−エリアに輝線からの光線が入り込むことを防
ぎ、液晶ディスプレイ上で輝線が視認されず、従って視
認性を悪化させずに有効発光面積に対して可能な限りビ
ュ−エリアを大きくとれて小形のバックライトが得られ
る。With such a structure of the light guide plate, the bright line is kept away from the effective light emitting portion to prevent light rays from the bright line from entering the viewing area of the liquid crystal display, and the bright line is not visually recognized on the liquid crystal display. Therefore, the view area can be made as large as possible with respect to the effective light emitting area without deteriorating the visibility, and a small backlight can be obtained.
【００２０】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。The main part of the present invention has such a constitution and is used as a backlight of a panel, particularly a liquid crystal panel. In the present invention, it is preferable to have the following configuration.
【００２１】また、線状光源を覆った光反射板又はフィ
ルム（図中５）の端部が、線状光源が近接した導光板の
少なくとも一方の広い面に接着されていると、接着部に
よって前記した輝線部が更に高輝度になるので、本発明
の効果はさらに増大する。If the end of the light reflection plate or film (5 in the figure) covering the linear light source is adhered to at least one wide surface of the light guide plate adjacent to the linear light source, the adhesive portion causes Since the above-mentioned bright line portion has higher brightness, the effect of the present invention is further enhanced.
【００２２】尚、光拡散板又はフィルム（図中２）は、
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。又、鏡面又は光反射板又は同フィルム（図中３）は
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。The light diffusing plate or film (2 in the figure) is
The light emitted from the surface of the light guide plate is scattered and allowed to pass therethrough, and one or more light diffusion plates are used as necessary. Further, the mirror surface, the light reflection plate or the film (3 in the figure) 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.
【００２３】尚、導光板の入光部を断面形状が凸状又は
凹状にしても、導光板の相対する広い面の間隔（導光板
の厚さ）を線状光源から離れるに従って序々に薄くして
も本発明の効果は同様である。Even if the light entrance portion of the light guide plate has a convex or concave cross-sectional shape, the distance between the wide surfaces of the light guide plate facing each other (thickness of the light guide plate) is gradually reduced with increasing distance from the linear light source. However, the effect of the present invention is the same.
【００２４】[0024]
【発明の効果】本発明は、規定の有効発光面積を保持し
た小形のバックライトである。The present invention is a small-sized backlight that maintains a specified effective light emitting area.
【００２５】[0025]
【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４に示すような厚さ４ｍｍの長方形ア
クリル板（２０５ｍｍ×１６０ｍｍ、旭化成株式会社製
デラグラスＡ）の長手の両端部に、直径３．８ｍｍ長さ
２３０ｍｍの太さの冷陰極蛍光管（ハリソン電機株式会
社製ノ−マル管）を配置し、その管の外周をＡｇフィル
ム（中井工業株式会社製）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光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. As shown in FIG. 4, a rectangular acrylic plate having a thickness of 4 mm (205 mm × 160 mm, Delaglass A manufactured by Asahi Kasei Corporation) is provided at both longitudinal ends with a cold cathode fluorescent tube having a diameter of 3.8 mm and a length of 230 mm (Harrison Electric Co., Ltd.). A normal tube manufactured by Co., Ltd. is arranged, the outer circumference of the tube is covered with an Ag film (made by Nakai Industry Co., Ltd.), and light emitted from a slit having a width of 4 mm facing the end portion of the light guiding plate of the Ag film is a light guiding plate. It was arranged so that light could enter the light guide plate from the end portion of.
【００２６】一方、導光板面上には光散乱物質（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、スクリ−ン版下は、下記の条件
でＣＡＤを用いて作成した。光拡散物質の被覆率が、最
小の地点（線状光源近傍）で２０％、最大の地点（導光
板中央部）で９５％、その中間では被覆率が最小の地点
からこれらの比率を順次増加した値となるように作図し
た。On the other hand, an ink containing a light-scattering substance (titania) was screen-printed on a surface of the light guide plate with a circular dot pattern at a pitch of 1 mm, and a CAD was used under the following conditions under the screen printing plate. Created. The light diffusing substance coverage is 20% at the minimum point (near the linear light source), 95% at the maximum point (center of the light guide plate), and in the middle, these ratios are sequentially increased from the point with the lowest coverage rate. It was drawn so that it would be the value.
【００２７】尚、導光板の有効発光面積が２０４ｍｍ×
１５２ｍｍとなるように、導光板面に対する印刷は導光
板に対してセンタ−振り分けで実施した。（従って、導
光板の線状光源側から４ｍｍの地点から有効発光部とし
て利用していることになる。）光源を覆ったＡｇフィル
ムの導光板の出光面側の端部を、導光板の出光面の表面
と幅３．５ｍｍ厚さ０．１６ｍｍの両面テ−プ（株式会
社寺岡製作所製ＷＰＴ−Ｎｏ７５０Ｆ）で接着し、他方
の端部は後述の光拡散反射板の端部（導光板に面した面
と反対側の端部面）に接着しケースで挾持した。The effective light emitting area of the light guide plate is 204 mm ×
Printing on the surface of the light guide plate was performed by centering the light guide plate so that the length was 152 mm. (Therefore, it is used as an effective light emitting portion from a point 4 mm from the linear light source side of the light guide plate.) The end portion of the Ag film covering the light source on the light emitting surface side of the light guide plate is emitted from the light guide plate. It is adhered to the surface of the surface with a double-sided tape (WPT-No750F manufactured by Teraoka Seisakusho Co., Ltd.) having a width of 3.5 mm and a thickness of 0.16 mm, and the other end is an end of a light diffusing reflection plate described later (on the light guide plate. It was adhered to the end surface opposite to the facing surface) and held by a case.
【００２８】導光板は図３に示したように、ストッパ−
要素（２ｍｍ×２ｍｍ、材質はＡＢＳでバックライトの
プラスチックケ−スと一体化されている）で固定した。The light guide plate is, as shown in FIG.
It was fixed with an element (2 mm × 2 mm, made of ABS and integrated with the plastic case of the backlight).
【００２９】厚さ０．１３ｍｍのポリエステルからなる
白色の光拡散反射板（ＩＣＩ社製メリネックス３２９）
は導光板の光散乱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（ＧＥ社製８Ｂ３６）は粗面側が導光板側と
は反対側になるようにして、導光板の出光面のほぼ全面
を覆うように配置した。White light diffuse reflector made of polyester having a thickness of 0.13 mm (Melinex 329 manufactured by ICI)
Was placed so as to cover the entire surface of the light guide plate coated with the light scattering material. The light diffusion plate (8B36 made by GE) made of polycarbonate with a thickness of 0.18 mm is arranged so that the rough surface side is the opposite side to the light guide plate side and covers almost the entire light exit surface of the light guide plate. Placed in.
【００３０】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（菅電流５ｍＡ）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。この時の有効発光面積内の９９点（均等割
り）平均輝度は１３００ｃｄ／ｍ2であった。そして、
導光板の線状光源直近に発生する輝線の最大輝度は２２
００ｃｄ／ｍ2であった。The surface luminance when an alternating voltage of 30 KHz was applied to the cold cathode tube by an inverter and driven at a constant current (tube current 5 mA) was measured by a luminance meter (Topcon BM-8). At this time, the average luminance of 99 points (evenly divided) within the effective light emitting area was 1300 cd / m 2 . And
The maximum brightness of the bright line generated near the linear light source of the light guide plate is 22.
It was 00 cd / m 2 .
【００３１】バックライトを液晶ディスプレイに組み込
んでビュ−エリアを観察したところ、輝線が視認され、
著しく視認性が悪化した。（比較例） 次に、アクリル板の最大外形を（２０５ｍｍ×１６４ｍ
ｍ）にし、光源近傍の導光板の形状を図４に示したよう
に、その角部分を２ｍｍ×２ｍｍ厚さ ｍｍに欠削加
工し、その部分に図４に示したようにストッパ−を重ね
た以外は比較例と同様にバックライトを構成し、同様の
測定機で測定した平均輝度は１３００ｃｄ／ｍ2であっ
た。そして、導光板の線状光源直近に発生する輝線の最
大輝度は２２００ｃｄ／ｍ2であった。When the viewing area was observed by incorporating the backlight into the liquid crystal display, bright lines were visually recognized,
The visibility deteriorated significantly. (Comparative Example) Next, the maximum outer shape of the acrylic plate is (205 mm × 164 m).
m) and shape the shape of the light guide plate in the vicinity of the light source as shown in FIG. 4 by notching the corners to 2 mm × 2 mm thickness mm, and overlaying the stopper on that part as shown in FIG. A backlight was formed in the same manner as in the comparative example except that the average luminance was 1300 cd / m 2 measured by the same measuring machine. The maximum brightness of the bright line generated in the vicinity of the linear light source of the light guide plate was 2200 cd / m 2 .
【００３２】バックライトを液晶ディスプレイに組み込
んでビュ−エリアを観察したところ、輝線は視認され
ず、視認性は悪化しなかった。（実施例）When the view area was observed by incorporating a backlight into a liquid crystal display, bright lines were not visually recognized, and visibility was not deteriorated. (Example)
【図１】バックライトの概略を示す斜視図FIG. 1 is a perspective view showing an outline of a backlight.
【図２】バックライトの概略を示す断面図FIG. 2 is a sectional view showing an outline of a backlight.
【図３】従来のバックライトの導光板形状の平面図FIG. 3 is a plan view of a light guide plate shape of a conventional backlight.
【図４】従来のバックライトの導光板の斜視図FIG. 4 is a perspective view of a light guide plate of a conventional backlight.
【図５】本発明の一実施態様のバックライトの導光板形
状を示す平面図FIG. 5 is a plan view showing a light guide plate shape of a backlight according to an embodiment of the present invention.
【図６】本発明の一実施態様のバックライトの導光板の
斜視図FIG. 6 is a perspective view of a light guide plate of a backlight according to an embodiment of the present invention.
【図７】本発明の一実施態様のバックライトの導光板の
側面図FIG. 7 is a side view of the light guide plate of the backlight according to the embodiment of the present invention.
１：導光板 ２：光拡散板 ３：光反射板又はフィルム ４：線状光源 ５：光反射板又はフィルム ６：光散乱物質 ７：有効発光部 ８：欠削部 ９：ストッパ− １０：バックライトケース 1: Light guide plate 2: Light diffusing plate 3: Light reflecting plate or film 4: Linear light source 5: Light reflecting plate or film 6: Light scattering material 7: Effective light emitting part 8: Notch part 9: Stopper 10: Back Light case
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成５年６月８日[Submission date] June 8, 1993
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００３１[Correction target item name] 0031
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００３１】バックライトを液晶ディスプレイに組み込
んでビュ−エリアを観察したところ、輝線が視認され、
著しく視認性が悪化した。（比較例） 次に、アクリル板の最大外形を（２０５ｍｍ×１６４ｍ
ｍ）にし、光源近傍の導光板の形状を図５に示したよう
に、その角部分を２ｍｍ×２ｍｍ厚さ４ｍｍに欠削加工
し、その部分に図６に示したようにストッパ−を重ねた
以外は比較例と同様にバックライトを構成し、同様の測
定機で測定した平均輝度は１３００ｃｄ／ｍ2であっ
た。そして、導光板の線状光源直近に発生する輝線の最
大輝度は２２００ｃｄ／ｍ2であった。When the viewing area was observed by incorporating the backlight into the liquid crystal display, bright lines were visually recognized,
The visibility deteriorated significantly. (Comparative Example) Next, the maximum outer shape of the acrylic plate is (205 mm × 164 m).
to m), the shape of the light source near the light guide plate as shown in FIG. 5, and Ketsukezu processing the corner portion 2mm × 2mm thickness 4 mm, the stopper as shown in FIG. 6 in that portion - the A backlight was constructed in the same manner as in the comparative example except that the layers were stacked, and the average luminance measured by the same measuring machine was 1300 cd / m 2 . The maximum brightness of the bright line generated in the vicinity of the linear light source of the light guide plate was 2200 cd / m 2 .
Claims (3)
も一側面端部に近接した線状光源を持つバックライトに
於いて、線状光源に近接した導光板端部の少なくとも一
箇所に欠削部を持つ導光板を用いたことを特徴とするパ
ネル用バックライト。1. A light guide plate made of a translucent material, and a backlight having a linear light source close to at least one side surface end portion of the light guide plate, wherein at least one end portion of the light guide plate close to the linear light source is defective. A backlight for a panel, which uses a light guide plate having a cut portion.
板の少なくとも一方の角部分に欠削部を持つ請求項１記
載のパネル用バックライト。2. The backlight for a panel according to claim 1, wherein at least one corner portion of the light guide plate has a cutout portion near both ends in the axial direction of the linear light source.
求項１又は２記載のパネル用バックライト。3. The backlight for a panel according to claim 1, wherein the depth of the cutout portion is within the thickness of the light guide plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5086126A JP2982549B2 (en) | 1993-04-13 | 1993-04-13 | Backlight |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5086126A JP2982549B2 (en) | 1993-04-13 | 1993-04-13 | Backlight |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06300924A true JPH06300924A (en) | 1994-10-28 |
| JP2982549B2 JP2982549B2 (en) | 1999-11-22 |
Family
ID=13878019
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5086126A Expired - Fee Related JP2982549B2 (en) | 1993-04-13 | 1993-04-13 | Backlight |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2982549B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002062434A (en) * | 2000-08-08 | 2002-02-28 | Internatl Business Mach Corp <Ibm> | Light transmission plate, side light type light source device and picture display device |
| JP2002170420A (en) * | 2000-11-22 | 2002-06-14 | Samsung Electronics Co Ltd | Light guide device, liquid crystal display module having the same and liquid crystal display device |
| WO2003014617A1 (en) * | 2001-08-02 | 2003-02-20 | Matsushita Electric Industrial Co.,Ltd | Lighting unit |
| JP2003346536A (en) * | 2002-05-28 | 2003-12-05 | Samsung Electronics Co Ltd | Back light assembly and liquid crystal display device provided therewith |
| WO2007026454A1 (en) * | 2005-08-30 | 2007-03-08 | Sharp Kabushiki Kaisha | Illumination device for display device, display device using the illumination device, and television receiver using the illumination device |
| KR20110061953A (en) * | 2009-12-02 | 2011-06-10 | 엘지디스플레이 주식회사 | Backlight unit and liquid crystal display device using the same |
| JP2013152809A (en) * | 2012-01-24 | 2013-08-08 | Minebea Co Ltd | Surface lighting device |
| KR20130111770A (en) * | 2012-04-02 | 2013-10-11 | 엘지이노텍 주식회사 | Backlight unit |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06186432A (en) * | 1992-12-17 | 1994-07-08 | Nissha Printing Co Ltd | Surface light emitting device |
-
1993
- 1993-04-13 JP JP5086126A patent/JP2982549B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06186432A (en) * | 1992-12-17 | 1994-07-08 | Nissha Printing Co Ltd | Surface light emitting device |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002062434A (en) * | 2000-08-08 | 2002-02-28 | Internatl Business Mach Corp <Ibm> | Light transmission plate, side light type light source device and picture display device |
| JP2002170420A (en) * | 2000-11-22 | 2002-06-14 | Samsung Electronics Co Ltd | Light guide device, liquid crystal display module having the same and liquid crystal display device |
| WO2003014617A1 (en) * | 2001-08-02 | 2003-02-20 | Matsushita Electric Industrial Co.,Ltd | Lighting unit |
| JP2003346536A (en) * | 2002-05-28 | 2003-12-05 | Samsung Electronics Co Ltd | Back light assembly and liquid crystal display device provided therewith |
| JP2009049017A (en) * | 2002-05-28 | 2009-03-05 | Samsung Electronics Co Ltd | Backlight assembly and liquid crystal display having this |
| WO2007026454A1 (en) * | 2005-08-30 | 2007-03-08 | Sharp Kabushiki Kaisha | Illumination device for display device, display device using the illumination device, and television receiver using the illumination device |
| US7616269B2 (en) | 2005-08-30 | 2009-11-10 | Sharp Kabushiki Kaisha | Illumination apparatus for display device, display device using the same, and television receiver apparatus comprising the display device |
| US7719630B2 (en) | 2005-08-30 | 2010-05-18 | Sharp Kabushiki Kaisha | Illumination apparatus for display device, display device using the same, and television receiver apparatus comprising the display device |
| KR20110061953A (en) * | 2009-12-02 | 2011-06-10 | 엘지디스플레이 주식회사 | Backlight unit and liquid crystal display device using the same |
| JP2013152809A (en) * | 2012-01-24 | 2013-08-08 | Minebea Co Ltd | Surface lighting device |
| KR20130111770A (en) * | 2012-04-02 | 2013-10-11 | 엘지이노텍 주식회사 | Backlight unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2982549B2 (en) | 1999-11-22 |
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| Date | Code | Title | Description |
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| LAPS | Cancellation because of no payment of annual fees |