【０００１】[0001]
【産業上の利用分野】本発明は液晶ディスプレイ（以下
ＬＣＤと称する）のバックライトとして用いられる平面
発光板に関し、特に導光板を利用した蛍光管サイドライ
ト方式の平面発光板に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat light emitting plate used as a backlight of a liquid crystal display (hereinafter referred to as LCD), and more particularly to a flat light emitting plate of a fluorescent tube sidelight type utilizing a light guide plate.
【０００２】[0002]
【従来の技術】従来のＬＣＤ用のバックライトシステム
について、図を参照して説明する。図３は蛍光管を応用
したＬＣＤバックライトシステムの基本構成を示すもの
である。2. Description of the Related Art A conventional backlight system for an LCD will be described with reference to the drawings. FIG. 3 shows the basic structure of an LCD backlight system to which a fluorescent tube is applied.
【０００３】ＬＣＤは非発光であるためバックライトが
不可欠である。また、視認性を改善するためにはバック
ライトの輝度向上が不可欠である。従来、携帯型機器に
おけるＬＣＤのバックライトシステムは、図３に示すよ
うにＬＣＤ１０の背面側に蛍光管１１，拡散板１２，反
射板１３，導光板１４からなる蛍光管サイドライト方式
による平面発光板を用いるのが一般的である。上記サイ
ドライト方式の平面発光板は、導光板１４の一端部側面
に１本の蛍光管１１が配設されているが、相対する側面
にさらに１本の蛍光管を配設したものもある。Since the LCD does not emit light, a backlight is indispensable. Further, in order to improve visibility, it is essential to improve the brightness of the backlight. 2. Description of the Related Art Conventionally, as shown in FIG. 3, a backlight system of an LCD in a portable device is a flat light emitting plate of a fluorescent tube sidelight system including a fluorescent tube 11, a diffusion plate 12, a reflector plate 13 and a light guide plate 14 on the back side of the LCD 10. Is generally used. In the side light type flat light emitting plate, one fluorescent tube 11 is arranged on one end side surface of the light guide plate 14, but there is also one in which one fluorescent tube is further arranged on the opposite side surface.
【０００４】[0004]
【発明が解決しようとする課題】しかし、これら蛍光管
サイドライト方式による平面発光板において、導光板に
は通常屈折率が高い，安価である，軽い，加工が容易等
の理由から一般的にメタクリル樹脂板が用いられてい
る。また、光を入射する導光板の端面は、入射光が端面
での乱反射や屈折によって導光板内に効率よく導入でき
ず光の変換効率が低下するのを防ぐため、平滑に研磨さ
れている。しかし、端面研磨には工数がかかるためコス
トが上がり、バックライトシステム全体のコストアップ
につながるという欠点があった。However, in these planar light emitting plates of the fluorescent tube sidelight type, the methacrylic resin is generally used for the light guide plate because of its high refractive index, low cost, light weight, and easy processing. A resin plate is used. Further, the end surface of the light guide plate on which light is incident is smoothly polished in order to prevent the incident light from being efficiently introduced into the light guide plate due to diffused reflection or refraction at the end surface so that the conversion efficiency of light is lowered. However, the end face polishing requires a lot of man-hours, so that the cost is increased and the cost of the entire backlight system is increased.
【０００５】[0005]
【課題を解決するための手段】そこで、本発明は上記問
題点を解決するために、これら蛍光管サイドライト方式
の平面発光板において、導光板の端面に透明のポリマー
を塗布することにより、光が入射する導光板の端面を容
易に平滑化したことを特徴とする。また、上記導光板の
端面に透明のプラスチックテープを貼り付けたことを特
徴とする。SUMMARY OF THE INVENTION In order to solve the above problems, the present invention proposes a flat light emitting plate of the fluorescent tube side light system, in which a transparent polymer is applied to the end surface of the light guide plate so that the light It is characterized in that the end surface of the light guide plate on which is incident is easily smoothed. In addition, a transparent plastic tape is attached to an end surface of the light guide plate.
【０００６】[0006]
【作用】本発明によれば、導光板の端面に透明なポリマ
ーを塗布したり、透明なプラスチックテープを貼り付け
ることにより、光が入射する端面を平滑にすることがで
きて、研磨と同様の平滑な端面を実現でき、容易に光の
導入効率を上げることができるので、低コストで変換効
率を向上したバックライトシステムを得ることができ
る。According to the present invention, by applying a transparent polymer or attaching a transparent plastic tape to the end surface of the light guide plate, the end surface on which the light is incident can be made smooth, which is similar to polishing. Since a smooth end face can be realized and the light introduction efficiency can be easily increased, a backlight system with improved conversion efficiency can be obtained at low cost.
【０００７】[0007]
【実施例】本発明における実施例について、図１，２を
参照しながら説明する。図１は本発明の第１実施例の導
光板の端部を示す要部拡大断面図である。なお、拡散板
と反射板は省略している。本実施例では導光板１の蛍光
管３側の端面に導光板１と同種のメタクリル樹脂のポリ
マーからなる樹脂層２を薄く塗布することにより、平滑
面に仕上げている。このように、薄い樹脂層２で端面を
平滑化することにより、蛍光管３の光を効率よく導光板
１の中に入射することができ、バックライトの輝度を向
上させることができる。例えば、全光束５４［lm］の蛍
光管と面積２８６平方センチメートルの端面研磨してい
ない導光板，拡散板，反射板を組み合わせバックライト
の輝度は１００［cd／平方メートル］であるが、本発明
のように導光板１の蛍光管３側の端面に導光板１と同種
のメタクリル樹脂ポリマーからなる樹脂層２を薄く塗布
することにより、平滑面に仕上げた場合、輝度は１２０
［cd／平方メートル］と約１．２倍に向上する。EXAMPLES Examples of the present invention will be described with reference to FIGS. FIG. 1 is an enlarged sectional view of an essential part showing an end of a light guide plate according to a first embodiment of the present invention. The diffuser plate and the reflector are omitted. In this embodiment, the resin layer 2 made of a polymer of the same methacrylic resin as that of the light guide plate 1 is thinly applied to the end face of the light guide plate 1 on the side of the fluorescent tube 3 to finish the surface smooth. In this way, by smoothing the end face with the thin resin layer 2, the light of the fluorescent tube 3 can be efficiently incident into the light guide plate 1, and the brightness of the backlight can be improved. For example, the brightness of the backlight is 100 [cd / square meter] by combining a fluorescent tube with a total luminous flux of 54 [lm] and a light guide plate, a diffuser plate, and a reflector plate whose surface is 286 square centimeters and whose end surface is not polished. When the end face of the light guide plate 1 on the side of the fluorescent tube 3 is thinly coated with the resin layer 2 made of the same kind of methacrylic resin polymer as the light guide plate 1, the brightness is 120 when finished to a smooth surface.
[Cd / square meter] is improved by about 1.2 times.
【０００８】また、汎用の樹脂，例えばポリエステル系
やアクリル系の接着剤を薄く塗布することにより、平滑
化しても同様な効果が得られる。Further, even if a general-purpose resin, for example, a polyester or acrylic adhesive is thinly applied and smoothed, the same effect can be obtained.
【０００９】次に本発明の第２実施例について説明す
る。図２は、本発明の第２実施例の導光板の端部を示す
要部拡大断面図である。拡散板と反射板は省略してい
る。本実施例では導光板１の蛍光管３側の端面にポリエ
チレンテレフタレート（ＰＥＴ）等からなるプラスチッ
クフィルム４に透明性に優れた接着層５を塗布したプラ
スチックテープ６を貼り付けることにより、端面を平滑
化している。本方法では第１実施例よりも容易に同様な
効果を得ることができ、さらにはシステム全体の低コス
ト化も実現できる。Next, a second embodiment of the present invention will be described. FIG. 2 is an enlarged sectional view of an essential part showing an end portion of the light guide plate of the second embodiment of the present invention. The diffuser and reflector are omitted. In this embodiment, the end surface of the light guide plate 1 on the side of the fluorescent tube 3 is smoothed by attaching a plastic tape 6 formed by coating a plastic film 4 made of polyethylene terephthalate (PET) or the like with a highly transparent adhesive layer 5 on the end surface. It has become. With this method, similar effects can be obtained more easily than in the first embodiment, and further cost reduction of the entire system can be realized.
【００１０】[0010]
【発明の効果】本発明によれば、導光板の端面に透明な
ポリマーを塗布したり、プラスチックテープを貼り付け
ることによって、光が入射する端面を平滑にすることが
できて、研磨と同様の平滑面を容易に実現でき、容易に
光の導入効率を向上でき、低コストで変換効率を向上し
たバックライトシステムを得ることができる。According to the present invention, by applying a transparent polymer or attaching a plastic tape to the end surface of the light guide plate, the end surface on which the light is incident can be made smooth, which is similar to polishing. A smooth surface can be easily realized, the efficiency of introducing light can be easily improved, and a backlight system with improved conversion efficiency can be obtained at low cost.
【図１】 本発明の第１実施例を示す平面発光板の要部
拡大断面図FIG. 1 is an enlarged sectional view of an essential part of a flat light emitting plate showing a first embodiment of the present invention.
【図２】 本発明の第２実施例を示す平面発光板の要部
拡大断面図FIG. 2 is an enlarged sectional view of an essential part of a flat light emitting plate showing a second embodiment of the present invention.
【図３】 蛍光管を応用した従来のＬＣＤバックライト
システムの基本構成を示す断面図FIG. 3 is a sectional view showing a basic configuration of a conventional LCD backlight system to which a fluorescent tube is applied.
１ 導光板 ２ 樹脂層 ３ 蛍光管 ４ プラスチックフィルム ５ 接着層 ６ プラスチックテープ 1 Light guide plate 2 Resin layer 3 Fluorescent tube 4 Plastic film 5 Adhesive layer 6 Plastic tape
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| JP3310624AJPH05142424A (en) | 1991-11-26 | 1991-11-26 | Plane light emitting plate |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3310624AJPH05142424A (en) | 1991-11-26 | 1991-11-26 | Plane light emitting plate |
| Publication Number | Publication Date |
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| Application Number | Title | Priority Date | Filing Date |
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| JP3310624APendingJPH05142424A (en) | 1991-11-26 | 1991-11-26 | Plane light emitting plate |
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