JPH1062785A - Light-condensing diffusion plate and illumination panel for back light using that - Google Patents

Light-condensing diffusion plate and illumination panel for back light using that

Info

Publication number
JPH1062785A
JPH1062785A JP8239875A JP23987596A JPH1062785A JP H1062785 A JPH1062785 A JP H1062785A JP 8239875 A JP8239875 A JP 8239875A JP 23987596 A JP23987596 A JP 23987596A JP H1062785 A JPH1062785 A JP H1062785A
Authority
JP
Japan
Prior art keywords
light
sheet
fibers
prism
adhesive
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.)
Withdrawn
Application number
JP8239875A
Other languages
Japanese (ja)
Inventor
Shuzo Ohara
柊三 大原
Ryoichi Kitamura
良一 北村
Yoshinobu Yamazaki
順伸 山崎
Fumiya Terakado
文也 寺門
Takumi Kosugi
巧 小杉
Jungo Hirose
順吾 廣瀬
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Goyo Paper Working Co Ltd
Original Assignee
Goyo Paper Working Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Goyo Paper Working Co Ltd filed Critical Goyo Paper Working Co Ltd
Priority to JP8239875A priority Critical patent/JPH1062785A/en
Publication of JPH1062785A publication Critical patent/JPH1062785A/en
Withdrawn legal-status Critical Current

Links

Landscapes

  • Light Guides In General And Applications Therefor (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain a wide visual angle and high front-view brightness and to make a printed dot pattern of a light conducting plate invisible by arranging prism-like bodies each having a triangular cross section in straight ridges on one surface of a sheet to form a light-condensing structure and then implanting fibers on the other surface to form a light-diffusing structure. SOLUTION: A light-condensing structure 3 is formed by arranging prism-like bodies 2 each having a triangular cross section in straight ridges on one surface of a sheet 1, and a light-diffusing structure is formed by implanting fibers 4 with an adhesive 6 on the other surface. This light-condensing structure is a prism-like structure comprising prism-like bodies 2 each having a triangular cross section arranged in straight ridges. The triangular cross section is not limited so that each triangle may be an isosceles or scalene triangle. As for the sheet 1, any material can be used as far as it is transparent with little transmission loss, and usually, an acryl, polycarbonate or polyester synthetic resin is preferable, and a modified resin to improve formability is suitable.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、集光性構造を有す
る拡散板及びそれを用いたバックライト用照明パネルに
関し、更に詳しくは、液晶表示ディスプレイに使用され
るバックライトにおいて、導光板の印刷ドット・パター
ンを拡散して見えなくする機能を有するとともに、同時
に集光性機能を有し、より高い正面輝度が得られる集光
性拡散板及び該集光性拡散板を用いたバックライト用照
明パネルに関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light-diffusing plate having a light-collecting structure and a lighting panel for a backlight using the same, and more particularly, to printing of a light guide plate in a backlight used for a liquid crystal display. A light-diffusing plate having a function of diffusing a dot pattern to make it invisible and having a light-gathering function at the same time, and a higher front luminance can be obtained, and a backlight illumination using the light-gathering diffuser About the panel.

【0002】[0002]

【従来の技術】従来、液晶表示ディスプレイに使用され
るバックライトは、冷陰極管より照射された光線を上方
に導く導光板と、導光板の印刷ドット・パターンを拡散
させて見えなくし、かつ均一な光を得るための拡散板及
び液晶パネルの正面輝度を上げるための集光機能を有す
るプリズムシートの構成よりなる。近年、組立工程の合
理化のため、拡散板と集光機能を有するプリズムシート
とを一体化する試みが種々なされている。しかし、拡散
板をプリズムシートの裏面に単純に全面接着して一体化
したものは正面輝度が著しく低下し、実用的なものは得
られない。
2. Description of the Related Art Conventionally, a backlight used in a liquid crystal display has a light guide plate for guiding light rays emitted from a cold cathode tube upward, and a printed dot pattern of the light guide plate which is diffused to make it invisible and uniform. And a prism sheet having a light condensing function for increasing the front luminance of the liquid crystal panel. In recent years, various attempts have been made to integrate a diffusion plate and a prism sheet having a light-condensing function in order to streamline the assembly process. However, when the diffusion plate is simply bonded to the back surface of the prism sheet on the entire surface and integrated, the front luminance is significantly reduced, and a practical one cannot be obtained.

【0003】一方、拡散板とプリズムシートの貼り合わ
せにおいて、拡散板とプリズムシートの間に空気層を設
けることにより、輝度の低下もなく一体化させる方法が
特開平8−184704号に開示されている。この場合
の一体化法は、拡散板とプリズムシートとの間に微粒子
状の粘着剤(マイクロ粘着剤)が分散状態で配置され、
接着点を散在させることで均一な層厚の空気層を安定的
に得ることを特徴としている。更に、微粒子状の粘着剤
は、接着面積率が5%以下になるよう均一に塗工される
必要があるとしている。しかし、このような条件下での
一体化は、実用上強度的に不安があり、さらには、長期
の使用条件に対しても経時変化がおこる可能性がある。
On the other hand, Japanese Patent Application Laid-Open No. HEI 8-184704 discloses a method of bonding a diffusion plate and a prism sheet by providing an air layer between the diffusion plate and the prism sheet without lowering luminance. I have. The integration method in this case is that a particulate adhesive (micro adhesive) is arranged in a dispersed state between the diffusion plate and the prism sheet,
It is characterized in that an air layer having a uniform thickness is stably obtained by dispersing the bonding points. Furthermore, it is stated that the particulate adhesive needs to be uniformly coated so that the bonding area ratio is 5% or less. However, integration under such conditions is uneasy in terms of strength in practical use, and furthermore, there is a possibility that changes over time may occur even under long-term use conditions.

【0004】本発明者らは、強度及び経時変化の問題を
解決するために、プリズム状シートの裏面に空気を埋蔵
又は含有した層からなる光拡散性構造を設けた集光性拡
散板を開発し、先に特許出願(特願平8−188715
号等)した。しかし、このような集光性拡散板は、プリ
ズム状シートの裏面に光拡散性構造を強固に一体化すれ
ば空気層が減少し、輝度が低下する場合があるという問
題を含んでいる。
The present inventors have developed a light-condensing diffuser plate having a light-diffusing structure composed of a layer containing air or embedded on the back surface of a prism sheet in order to solve the problems of strength and aging. And filed a patent application (Japanese Patent Application No. 8-188715).
No.) However, such a light-concentrating diffuser has a problem that if the light-diffusing structure is firmly integrated on the back surface of the prismatic sheet, the air layer is reduced and the luminance may be reduced.

【0005】[0005]

【発明が解決しようとする課題】本発明は、上記公知技
術又は先願技術の問題を解消し、製造が容易で、視野角
を広く、且つ正面輝度を高くする機能を有し、しかも導
光板の印刷ドット・パターンが見えず、実用強度もあ
り、経時変化のない集光性拡散板を提供するものであ
る。
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems of the prior art or the prior art, has a function of facilitating manufacture, has a wide viewing angle, and has a high front luminance. The present invention provides a light-concentrating diffuser plate in which the printed dot pattern cannot be seen, has practical strength, and does not change with time.

【0006】[0006]

【課題を解決するための手段】本発明の第1は、シート
の一方の面に、断面が三角形状よりなる柱状物を直線畝
状に配列した集光性構造を有し、その反対側の面に、繊
維を植毛してなる光拡散性構造を有する集光性拡散板
を、本発明の第2は、上記の集光性拡散板の集光性構造
を有する面上にプリズムシートを重ねて設置したバック
ライト用照明パネルを、それぞれ内容とするものであ
る。
According to a first aspect of the present invention, there is provided a light-collecting structure in which a columnar member having a triangular cross section is arranged in a straight ridge on one surface of a sheet. On the surface, a light-diffusing plate having a light-diffusing structure formed by planting fibers is used. In the second aspect of the present invention, a prism sheet is stacked on the surface of the above-mentioned light-diffusing plate having the light-diffusing structure. The backlight illumination panel installed in the above manner is used as the content.

【0007】以下、本発明を図面に基づいて説明する。
図1は、本発明の集光性拡散板の実施態様を示し、シー
ト1の一方の面に、断面が三角形状よりなる柱状物2を
直線畝状に配列した集光性構造3を有し、その反対側の
面に、繊維4を接着剤6を介して植毛してなる光拡散性
構造5を有する。
Hereinafter, the present invention will be described with reference to the drawings.
FIG. 1 shows an embodiment of a light-concentrating diffusion plate of the present invention, in which one surface of a sheet 1 has a light-concentrating structure 3 in which pillars 2 each having a triangular cross section are arranged in a straight ridge. On the surface on the opposite side, there is provided a light diffusing structure 5 in which fibers 4 are implanted through an adhesive 6.

【0008】図2は本発明の集光性拡散板の他の実施態
様を示し、シート1の一方の面に、断面が三角形状より
なる柱状物2を直線畝状に配列した集光性構造3を有
し、その反対側の面に、別のシート7に繊維4を接着剤
8を介して植毛した植毛シート9の繊維4の露出先端部
を接着剤11を介して接着してなる光拡散性構造10を
有する。
FIG. 2 shows another embodiment of the light-condensing diffusing plate of the present invention. A light-condensing structure in which a columnar object 2 having a triangular cross section is arranged in a straight ridge on one surface of a sheet 1. 3 having an exposed end portion of the fiber 4 of the flocking sheet 9 in which the fiber 4 is planted on another sheet 7 with the adhesive 8 on the opposite surface. It has a diffusible structure 10.

【0009】本発明の集光性構造3は、シート1の一方
の面に断面が三角形状よりなる柱状物2を直線畝状に配
列したプリズム状のもので、断面の三角形状は特に制限
はなく、二等辺または不等辺でもよい。三角形状の頂角
は80〜120°が好ましく、また頂角に若干の丸味を
つけたものでもよい。三角形状の底辺は通常連接してい
るものが好ましいが、必ずしも連接していなくてもよ
く、また波形状で連接してもよい。底辺サイズについて
は通常30〜100μm、厚さは150〜200μm程
度が好適である。シート1は光透過損失の少ない透明な
材料であれば特に制限なく使用できるが、普通、アクリ
ル系、ポリカーボネート系、ポリエステル系合成樹脂な
どが好ましく、高屈折率を有するように、更には成形性
改良のために変性したものがより好適である。一方、集
光性構造3の反対側面は、植毛された繊維層からなる光
拡散性構造5(図1)又は10(図2)を具備する。
The light-collecting structure 3 according to the present invention is a prism-like structure in which columnar members 2 each having a triangular cross section are arranged on one surface of a sheet 1 in a straight ridge shape. The triangular cross section is not particularly limited. However, it may be an isosceles side or an unequal side. The apex angle of the triangular shape is preferably 80 to 120 °, and the apex angle may be slightly rounded. Usually, the triangular bases are preferably connected continuously, but may not necessarily be connected, and may be connected in a wave shape. The bottom size is preferably 30 to 100 μm, and the thickness is preferably about 150 to 200 μm. The sheet 1 can be used without any particular limitation as long as it is a transparent material having a small light transmission loss. However, it is usually preferable to use an acrylic, polycarbonate, or polyester synthetic resin, and to improve the moldability so as to have a high refractive index. Those modified for the above are more preferable. On the other hand, the opposite side of the light-collecting structure 3 is provided with a light-diffusing structure 5 (FIG. 1) or 10 (FIG. 2) composed of a planted fiber layer.

【0010】植毛された繊維層からなる光拡散性構造
は、集光性構造を有するシート1の集光性構造3の反対
側に直接植毛されることにより設けられるが、集光性構
造3の反対側面は平滑であっても若干の凹凸があっても
よい。植毛は、繊維による光拡散効果と光拡散性構造内
に多くの空気を含有できること、及び実用強度も充分有
している利点がある。この場合の植毛とは、接着剤を介
して、短繊維(パイル)を植付けることを意味し、その
方法は接着剤を塗布した、シート等の被植毛物に一定の
機械的振動を与え、その振動によって短繊維を植え付け
ると同時に立毛させ植毛する方法、あるいは、短繊維を
あらかじめ電気伝導性を付与させる導電化処理(電着処
理)を施して静電気を利用して立毛させ接着剤を介して
被植毛物に植毛する方法などがあり、その方法について
は特に制限はないが、植毛方向が一定で直立していて、
密集度がよく緻密に仕上がり、短繊維の接着強度がよ
く、生産能率がよい点で静電気式植毛法が好ましい。
The light diffusing structure composed of the flocculated fiber layer is provided by directly flocking the sheet 1 having the light-collecting structure on the side opposite to the light-collecting structure 3. The opposite side may be smooth or have some irregularities. The flocking has the advantage that the fiber has a light diffusion effect, a large amount of air can be contained in the light diffusion structure, and sufficient practical strength. The flocking in this case means planting short fibers (pile) via an adhesive, and the method applies a certain mechanical vibration to a flocking object such as a sheet to which the adhesive has been applied, A method of planting short fibers at the same time as the short fibers are planted by the vibration, or a method of planting the short fibers, or conducting a conductive treatment (electrodeposition treatment) for imparting electrical conductivity to the short fibers in advance and using the static electricity to grow the short fibers, and via an adhesive. There is a method of planting hair on the planted material, and the method is not particularly limited, but the direction of planting is constant and upright,
The electrostatic flocking method is preferred in that the density is good, the finish is fine, the short fiber has good adhesive strength, and the production efficiency is good.

【0011】使用される繊維は、本発明の目的から、細
くて短く、無色透明タイプのものがよく、天然繊維・合
成繊維・無機繊維・再生繊維・半合成繊維すべて使用さ
れるが、ポリアミド(ナイロン)系、ポリエステル系、
アクリル系、セルロース系及びガラス繊維等が好まし
い。より好ましくは空気を含有した繊維、例えば中空繊
維が望ましい。また短繊維はカット品でも粉砕品でもよ
く、そのサイズは、直径(d)が1〜50μm、長さ
(l)は5〜300μm程度が好ましい。微粉砕である
と繊維粒子を塗工したと同様となり、目的とする効果が
小さい。従って、少なくとも短繊維の直径と長さの比
(l/d)が1.5〜20が好ましい。短繊維の直径が
50μmを越えると、短繊維の接着している接着点が見
えてくるので好ましくない。また、短繊維の長さが30
0μmを越えると、得られる集光性拡散板の総厚みが厚
くなり、バックライトを使用する液晶表示装置の薄型化
に反するものとなる。使用される短繊維は、単一サイズ
の繊維であってもよく、またはサイズの若干異なるもの
を混合した繊維を使用してもよい。
For the purpose of the present invention, the fibers used are preferably thin, short, colorless and transparent type, and all natural fibers, synthetic fibers, inorganic fibers, regenerated fibers and semi-synthetic fibers are used. Nylon), polyester,
Acrylic, cellulosic and glass fibers are preferred. More preferably, a fiber containing air, for example, a hollow fiber is desirable. The short fiber may be a cut product or a crushed product, and the size thereof is preferably about 1 to 50 μm in diameter (d) and about 5 to 300 μm in length (l). When the pulverization is fine, it is the same as when the fiber particles are coated, and the intended effect is small. Therefore, the ratio (l / d) of the diameter and the length of the short fiber is preferably 1.5 to 20. If the diameter of the short fiber exceeds 50 μm, it is not preferable because the bonding point where the short fiber is bonded becomes visible. In addition, the short fiber length is 30
If it exceeds 0 μm, the total thickness of the condensing diffusing plate obtained becomes large, which is against the thinning of a liquid crystal display device using a backlight. The short fibers used may be fibers of a single size or fibers of a mixture of slightly different sizes.

【0012】短繊維の接着のために使用される植毛用接
着剤は、溶剤型とエマルジョン型があり、いずれも無色
透明な接着剤層を得るものが好ましい。溶剤型のものは
接着力、耐水性がよく、エポキシ系、フェノール系、ブ
チラール系、ポリウレタン系などあるが、処理される集
光性構造を有するシート1の耐溶剤性によっては使用で
きない場合もある。エマルジョン型は酢酸ビニル樹脂、
アクリル酸エステル樹脂、合成ゴム系樹脂などがあり、
接着力、耐久性はやや劣るが、シート1の素材の種類を
問わず使用可能でなる。とりわけ、架橋も可能なアクリ
ル酸エステル樹脂が好適である。
Adhesives for flocking used for bonding short fibers are of a solvent type and an emulsion type, and both are preferable to obtain a colorless and transparent adhesive layer. The solvent type has good adhesive strength and water resistance, and includes epoxy type, phenol type, butyral type, polyurethane type, etc., but may not be used depending on the solvent resistance of the sheet 1 having the light-collecting structure to be treated. . Emulsion type is vinyl acetate resin,
There are acrylic ester resin, synthetic rubber resin, etc.
Although the adhesive strength and durability are slightly inferior, the sheet 1 can be used regardless of the type of the material. In particular, an acrylate resin which can be crosslinked is suitable.

【0013】また、接着剤層には、光拡散効果の大きい
酸化チタンや、シリカ、ガラスなど中空ビーズ、アクリ
ロニトリル系発泡体を添加してもよく、特に集光性構造
を有する面上の「キズ」を見えにくくする目的でシリカ
中空ビーズが好適である。さらに光拡散性構造に帯電防
止性を付与し、ちり、ほこりの付着を防止し、またブロ
ッキングを防止してバックライト組立時の作業性を向上
させる目的で、植毛短繊維や接着剤層に帯電防止剤を使
用してもよい。使用される接着剤の塗工量は、使用され
る接着剤の種類、短繊維の直径及び長さにより左右さ
れ、それらに応じて適宜決定すればよい。
The adhesive layer may contain titanium oxide having a large light diffusion effect, hollow beads such as silica and glass, and an acrylonitrile-based foam. In order to make "" difficult to see, silica hollow beads are preferred. In addition, anti-static properties are imparted to the light diffusing structure to prevent dust and dirt from adhering, and also to prevent blocking and improve workability when assembling the backlight. Inhibitors may be used. The coating amount of the adhesive to be used depends on the type of the adhesive to be used, the diameter and the length of the short fiber, and may be appropriately determined according to them.

【0014】植毛される短繊維の密度は、加工速度や短
繊維の供給量で調整されるが、使用される短繊維の直
径、長さ及び接着剤に添加されるシリカ中空ビーズなど
によって異なり、更には導光板の反射ドット・パターン
特性などにより異なるので、これらを勘案して適宜決定
される。さらに植毛した短繊維の露出先端部に無色透明
フィルムを短繊維の脱落防止のために接着してもよい。
この目的に使用されるシートは上記シート1と同じ合成
樹脂が使用でき、更に他の無色透明の合成樹脂も使用で
き、その厚さは10〜50μm程度が好適である。ま
た、接着剤は無色透明なタイプで溶剤系、エマルジョン
系のいずれでもよく、実用強度を得る点で架橋タイプの
接着剤がよく、熱硬化、光硬化のタイプは問わないが、
特に加工工程上の点でUVキュアタイプが好ましい。さ
らに接着剤層に、前記した如く、光拡散効果を付与する
酸化チタンやシリカ中空ビーズなどを添加してもよい。
The density of the staple fibers to be planted is adjusted by the processing speed and the supply amount of the staple fibers, but differs depending on the diameter and length of the staple fibers used, silica hollow beads added to the adhesive, and the like. Furthermore, since it differs depending on the reflection dot and pattern characteristics of the light guide plate, it is appropriately determined in consideration of these. Further, a colorless and transparent film may be adhered to the exposed tip of the planted short fibers to prevent the short fibers from falling off.
For the sheet used for this purpose, the same synthetic resin as that of the sheet 1 can be used, and other colorless and transparent synthetic resin can also be used, and the thickness thereof is preferably about 10 to 50 μm. In addition, the adhesive may be any of a solvent type and an emulsion type in a colorless and transparent type, and a cross-linking type adhesive is preferable in terms of obtaining practical strength.
In particular, a UV cure type is preferable in terms of processing steps. Further, as described above, titanium oxide or silica hollow beads for providing a light diffusion effect may be added to the adhesive layer.

【0015】図2に示す集光性拡散板は、別に準備した
無色透明シート7上に短繊維4を接着剤8を介して植毛
した植毛シート9の繊維の露出先端部を、シート1の集
光性構造3の反対側面に接着させた構成からなる。この
場合の利点は、別の無色透明シート上に短繊維が植毛さ
れるので、シート1の耐溶剤性、耐熱性に影響されずに
植毛できる。さらにシート1との接着に関しては植毛用
以外の接着剤が使用可能となり、それだけ加工上の制約
が少なくなる。この場合の接着剤は、特に制限されない
が、無色透明なタイプでエマルジョン系、又は使用可能
であれば溶剤系いずれでもよく、実用強度を得る点で架
橋タイプの接着剤がよく、熱硬化、光硬化のタイプは問
わないが特に加工工程上の点でUVキュアタイプが好ま
しい。
The light-concentrating diffuser shown in FIG. 2 uses the exposed ends of the fibers of a flocking sheet 9 in which short fibers 4 are planted via an adhesive 8 on a colorless transparent sheet 7 prepared separately, and the light-collecting diffuser plate of the sheet 1 is collected. The optical structure 3 is bonded to the opposite side surface. The advantage in this case is that the short fibers are planted on another colorless and transparent sheet, so that the plant 1 can be planted without being affected by the solvent resistance and heat resistance. Further, as for the adhesion to the sheet 1, an adhesive other than for flocking can be used, and the processing restriction is reduced accordingly. The adhesive in this case is not particularly limited, but it may be a colorless and transparent type, an emulsion type, or a solvent type if available, and a cross-linkable type adhesive is preferable in terms of obtaining practical strength. The curing type is not limited, but a UV curing type is particularly preferred in terms of processing steps.

【0016】さらに図1の場合と同様、接着剤11に光
拡散効果の大きいシリカ等の中空ビーズを添加してもよ
く、また帯電防止剤を含有させてもよい。一方、植毛用
の接着剤8も同様に、シリカなどの中空ビーズ及び帯電
防止剤などを併用してもよい。
Further, as in the case of FIG. 1, hollow beads such as silica having a large light diffusion effect may be added to the adhesive 11, or an antistatic agent may be contained. On the other hand, the flocking adhesive 8 may similarly use hollow beads such as silica and an antistatic agent.

【0017】なお、植毛層を作製するために別に準備し
たシート7は、そのまま集光性構造を有するシート1と
一体化してもよく、また、集光性構造を有するシート1
と一体化した後、シート7を剥離して植毛層のみを集光
性構造を有するシート1に残留させてもよい。このよう
に、後から剥離する場合は、耐熱性および剥離性の点で
ポリメチルペンテン−1(商品名TPX、三井石油化学
工業株式会社製)からなるシートが好ましく、またポリ
エステルシートの表面無処理品も容易に剥離されるので
好ましい。シート7を剥がす利点は、バックライトの薄
型化に有効であり、また曲げ力が加わったときフィルム
があるとたるみが生じたりする場合があるが、これを防
止することにある。シート7は厚い方が均一な植毛がな
される利点があるが、通常50〜150μm程度が好適
である。
The sheet 7 separately prepared for producing the flocking layer may be integrated with the sheet 1 having the light-collecting structure as it is, or may be integrated with the sheet 1 having the light-collecting structure.
After the integration, the sheet 7 may be peeled off to leave only the flocking layer on the sheet 1 having the light-collecting structure. As described above, when peeling is performed later, a sheet made of polymethylpentene-1 (trade name: TPX, manufactured by Mitsui Petrochemical Industry Co., Ltd.) is preferable in terms of heat resistance and peelability, and the polyester sheet is not subjected to surface treatment. This is preferable because the product can be easily peeled off. The advantage of peeling off the sheet 7 is that it is effective for reducing the thickness of the backlight, and that when a bending force is applied, the film may cause slack. The thicker sheet 7 has the advantage that uniform flocking is achieved, but is preferably about 50 to 150 μm.

【0018】上記構成からなる本発明の集光性拡散板
は、特にバックライト用照明パネル用に好適に用いられ
る。即ち、集光性拡散板の集光構造を有する面上にプリ
ズムシートを重ねて設置してバックライト用照明パネル
として使用される。プリズムシートの重ね方は通常、集
光性拡散板の断面三角形状よりなる柱状物の直線畝状配
列に対し、重ね合わせるプリズムシートのプリズム方向
が概ね90°になるように且つプリズム面が上方になる
ように重ね合わせられるが、その配置については特にこ
れに制限されず、また重ね合わせる枚数も1枚でも複数
枚でも可能である。
The light-concentrating diffuser of the present invention having the above-described structure is suitably used particularly for a backlight illumination panel. That is, the prism sheet is placed on the surface of the light-concentrating diffusion plate having the light-condensing structure, and used as a backlight illumination panel. The method of stacking the prism sheets is generally such that the prism direction of the prism sheets to be overlapped is approximately 90 ° and the prism surface is upward with respect to the linear ridge arrangement of the columnar objects having a triangular cross section of the light-collecting diffusion plate. However, the arrangement is not particularly limited, and the number of superimposed sheets may be one or more.

【0019】本発明の集光性拡散板は、実用上充分な強
度を有するとともに、経時変化を起こさず、従来使用の
拡散板が不要となる。バックライト用照明パネルとして
の性能も正面輝度を向上させ、同時に視野角も広げる特
徴を有している。また光拡散性構造内に多くの空気を含
有することによりモアレ防止効果も付与され、さらには
集光性構造をもつ面のキズを目立たなくする効果も有し
ている。更にまた、帯電防止処理を施すことにより、集
光性拡散板の帯電を防止し、ちり、ほこりの付着を防止
するとともに、ブロッキングを防止しバックライト組立
時の作業性が大きく向上する。
The light-concentrating diffuser of the present invention has sufficient strength for practical use, does not change with time, and eliminates the need for a conventional diffuser. The performance as a backlight illumination panel also has the feature of improving the front luminance and at the same time widening the viewing angle. Further, by containing a large amount of air in the light diffusing structure, a moiré preventing effect is imparted, and further, the surface having the light collecting structure has an effect of making scratches less noticeable. Furthermore, by performing an antistatic treatment, charging of the light-condensing diffuser plate is prevented, dust and dust are prevented from adhering, blocking is prevented, and workability at the time of assembling the backlight is greatly improved.

【0020】[0020]

【実施例】以下、実施例により本発明をさらに詳細に説
明するが、本発明はかかる実施例のみに限定されるもの
ではない。尚、「部」、「%」は特に断らない限り、そ
れぞれ「重量部」、「重量%」を表す。以下の実施例で
使用したバックライトは、液晶表示用のバックライトで
あり、166mm×129mm(8インチ相当)の長辺方向
の一端に一灯設置した冷陰極線管に電圧12ボルト、電
流0.6アンペアをインバーターを通して供給した。こ
の導光板には、裏面に反射板と表面に拡散板が具備され
ており、この導光板上の拡散板表面の法線方向に600
mmの距離の場所で、LUMINANCE COLORI
METER(TOPCON社製BM5A)により輝度及
び視野角を測定した。この時、集光性拡散板の長手方向
(冷陰極管の方向)をX方向といい、正面法線上を0°
とし長手方向に左右にふらした角度で輝度を測定し、X
方向の視野角と表示した。また、集光性拡散板の短辺方
向(冷陰極管に対し垂直方向)をY方向といい、正面法
線上を0度とし短辺方向に前後にふらした角度で輝度を
測定し、Y方向の視野角と表示した。導光板の印刷ドッ
ト・パターンの確認は、集光性拡散板をバックライト用
照明パネルに組み込んで実際に使用する際に目視で行な
った。
EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Note that “parts” and “%” represent “parts by weight” and “% by weight”, respectively, unless otherwise specified. The backlight used in the following examples is a backlight for a liquid crystal display, and a voltage of 12 volts and a current of 0 volts is applied to a cold cathode ray tube installed at one end in the long side direction of 166 mm × 129 mm (corresponding to 8 inches). Six amps were supplied through an inverter. This light guide plate is provided with a reflection plate on the back surface and a diffusion plate on the front surface.
mm distance, LUMINANCE COLORI
The luminance and the viewing angle were measured by METER (BM5A manufactured by TOPCON). At this time, the longitudinal direction of the light-diffusing diffuser (the direction of the cold-cathode tube) is referred to as the X direction, and 0 ° on the front normal line.
And measure the luminance at an angle that is displaced from side to side in the longitudinal direction.
Direction viewing angle. The short side direction (perpendicular to the cold cathode tube) of the light-concentrating diffuser is referred to as the Y direction. Viewing angle. The printed dot pattern of the light guide plate was confirmed visually when the light-collecting diffuser plate was incorporated into a backlight illumination panel and actually used.

【0021】実施例1 集光性構造を有するシートとし、ポリカーボネート系樹
脂よりなる断面三角形状が二等辺三角形で底辺50μ
m、その直角が90°よりなる柱状物を50μmのピッ
チで直線畝状に配列したプリズム状シートで厚さ160
μmのものを準備した。短繊維としては、ポリエステル
中空繊維の粉砕品で中空率20%、太さ2デニール、長
さ30〜60μm品を篩にかけて選別し準備した。植毛
用の接着剤は、アクリル系エマルジョン樹脂EK−10
05(サイデン化学株式会社製、固形分39%)100
部にエポキシ系硬化剤「A−52」(サイデン化学株式
会社製)4部を添加し、さらに帯電防止剤として「ケミ
スタット3500」(三洋化成工業株式会社製、固形分
99%)0.5部添加し調整した。集光性構造を有する
シートの反対側面に前記植毛用の接着剤を4g/m
2 (固形分)塗工し、接着剤層を上面にし陰極側に置
き、上方より、前記植毛用短繊維を常法により電着処理
されたものを篩落としホッパーから一様に落とし、50
KVの高電圧を加えた陽極の間隙を通過させ、接着剤層
面に垂直に短繊維を電気植毛した。植毛後110℃で3
分、接着剤の硬化処理をした。植毛の密度は4g/m2
であった。植毛強度は、通常のセロファンテープテスト
で剥がれがなく、実用上十分な強度のものであった。こ
のようにして、得られた集光性拡散板のプリズム状面の
上に別に準備したプリズムシートのTD方向を重ねた場
合の輝度と視野特性を測定した。結果を図3(図中)
に示したが、この集光性拡散板は、後記比較例1として
示した、拡散板とプリズムシートのMD・TD方向の合
計3枚を重ねたものと比較して、正面輝度はやや低下す
るが、視野角が著しく広いものであった。導光板の印刷
ドット・パターンも見えなかった。一方、この集光性拡
散板の実用試験をプリズムシートの信頼性テストに準じ
て行なったが、実用上十分な強度を有し、また経時変化
も認められなかった。さらに帯電防止剤の添加効果によ
り、ちり、ほこりの付着しにくいことも確認された。
尚、MD方向とは、冷陰極管と同方向にプリズムの長さ
方向をおき、三角柱状物が冷陰極管に垂直である方向を
いい、TD方向とは冷陰極管と平行にプリズムの三角柱
状物がある方向をいう。
Example 1 A sheet having a light-collecting structure was formed. A triangular cross section made of a polycarbonate resin was an isosceles triangle and a base of 50 μm.
m, a prism-like sheet having columnar objects having a right angle of 90 ° arranged in a linear ridge at a pitch of 50 μm, and having a thickness of 160
μm was prepared. As the short fiber, a crushed polyester hollow fiber product having a hollow ratio of 20%, a thickness of 2 denier, and a length of 30 to 60 μm was sifted and prepared. The adhesive for flocking is acrylic emulsion resin EK-10.
05 (manufactured by Seiden Chemical Co., Ltd., solid content 39%) 100
4 parts of an epoxy-based curing agent "A-52" (manufactured by Seiden Chemical Co., Ltd.) was added to the mixture, and 0.5 part of "Chemistat 3500" (manufactured by Sanyo Chemical Industries, Ltd., solid content 99%) was further added as an antistatic agent. It was added and adjusted. 4 g / m of the flocking adhesive on the opposite side of the sheet having the light-collecting structure
2 (Solid content) is applied, the adhesive layer is placed on the cathode side with the adhesive layer on the upper side, and the short fiber for flocking is electrodeposited by a conventional method and sieved from above, and uniformly dropped from the hopper.
Short fibers were electroplanted perpendicularly to the surface of the adhesive layer by passing through the gap between the anodes to which a high voltage of KV was applied. 3 at 110 ° C after flocking
Then, the adhesive was cured. The flocking density is 4 g / m 2
Met. The flocking strength was sufficient for practical use without peeling in a normal cellophane tape test. In this way, the luminance and the visual field characteristics when the TD direction of the separately prepared prism sheet was overlapped on the prism-shaped surface of the obtained light-diffusing diffuser were measured. The results are shown in Fig. 3 (in the figure)
As shown in Comparative Example 1, the front luminance of this light-condensing diffuser is slightly lower than that of the diffuser and the prism sheet, which is a total of three in the MD and TD directions, which is shown as Comparative Example 1 described later. However, the viewing angle was remarkably wide. No printed dot pattern on the light guide was visible. On the other hand, a practical test of this light-condensing diffuser plate was carried out in accordance with a reliability test of the prism sheet, but it had sufficient strength for practical use, and no change with time was observed. Further, it was confirmed that dust and dust hardly adhered due to the effect of adding the antistatic agent.
Note that the MD direction refers to the direction in which the length of the prism is set in the same direction as the cold-cathode tube, and the triangular prism is perpendicular to the cold-cathode tube. The direction in which the columnar object is located.

【0022】実施例2 実施例1と同様の集光性構造を有するプリズム状シート
(プリズム状方向はMD方向)を準備した。別に厚さ1
6μmのポリエステルシートの表面にフレーム処理を施
し、短繊維として、電着処理した太さ0.8デニール、
長さ200μmのナイロンを用い、実施例1と同様の植
毛用接着剤を使用し、実施例1と同様の方法で前記ポリ
エステルシート上に静電気植毛し、植毛シートを得た。
植毛の密度は5g/m2 であった。植毛強度は、通常の
セロファンテープテストで剥がれがなく、実用上十分な
強度のものであった。一方、前記集光性構造を有するシ
ートの反射側面に、アクリルエマルジョン系接着剤AP
−130A(中央理化工業株式会社製、固形分60%)
100部に硬化剤AP−130B(中央理化工業株式会
社製、固形分30%)5部混合し、4g/m2 (固形
分)になるように塗工し、前記植毛シートの繊維の露出
先端部を接着して一体化した。得られた集光性拡散板の
プリズム状面の上に別に準備したプリズムシートのTD
方向を重ね、実施例1と同様にして輝度と視野特性を測
定した。結果は図3(図中)に示したが、後記比較例
1として示した、拡散板と無処理のプリズムシートを2
枚重ねたものと比較して、正面輝度はわずかに劣るが実
用上さしつかえなく、良好な集光性を示し、かつ視野角
も広いものであった。また導光板の印刷ドット・パター
ンも見えなかった。さらに、実施例1と同様の実用試験
においても実用上十分な強度を有し、経時変化も認めら
れなかった。帯電防止剤の添加効果により、ちり・ほこ
りの付着しにくいものであった。
Example 2 A prism sheet having the same light-collecting structure as in Example 1 (the prism direction is the MD direction) was prepared. Separately thickness 1
The surface of a 6 μm polyester sheet is subjected to a frame treatment, and as a short fiber, is electroplated to a thickness of 0.8 denier.
Using nylon having a length of 200 μm and the same adhesive for flocking as in Example 1, electrostatic flocking was performed on the polyester sheet in the same manner as in Example 1 to obtain a flocking sheet.
The flocking density was 5 g / m 2 . The flocking strength was sufficient for practical use without peeling in a normal cellophane tape test. On the other hand, an acrylic emulsion-based adhesive AP is provided on the reflection side surface of the sheet having the light-collecting structure.
-130A (Chuo Rika Kogyo Co., Ltd., solid content 60%)
To 100 parts, 5 parts of a curing agent AP-130B (manufactured by Chuo Rika Kogyo Co., Ltd., solid content: 30%) were mixed, and coated so as to be 4 g / m 2 (solid content). The parts were bonded and integrated. TD of a prism sheet separately prepared on the prismatic surface of the obtained light-diffusing diffuser
The directions were overlapped, and the luminance and the visual field characteristics were measured in the same manner as in Example 1. The results are shown in FIG. 3 (in the figure), and the diffusion plate and the untreated prism sheet shown in Comparative Example 1 described below
The front luminance was slightly inferior to the stacked ones, but it was practically insignificant, showed good light-collecting properties, and had a wide viewing angle. Also, the printed dot pattern on the light guide plate was not visible. Furthermore, in a practical test similar to that of Example 1, it had practically sufficient strength and no change with time was observed. Due to the effect of adding the antistatic agent, dust and dust hardly adhered.

【0023】実施例3 実施例2で使用した厚さ16μmのポリエステルシート
の表面フレーム処理品を厚さ75μmのポリエステルシ
ートの表面無処理品にかえて、その他は実施例2と同様
にして静電気植毛された植毛シートを得、さらに実施例
2と同様に集光性構造を有するシートの反対側面に一体
化した。ついで前記ポリエステルシートをシート表面と
植毛用接着剤層の間でシートのみを剥して、集光性拡散
板を得た。このものは、図3(図中)に示すように、
実施例2より若干低い輝度を示したが、視野角は若干広
かった。
Example 3 Electrostatic flocking was carried out in the same manner as in Example 2 except that the surface-treated product of the 16 μm-thick polyester sheet used in Example 2 was replaced with a 75 μm-thick polyester sheet without surface treatment. The obtained flocking sheet was obtained and further integrated on the opposite side of the sheet having the light-collecting structure in the same manner as in Example 2. Then, the polyester sheet was peeled off only between the sheet surface and the flocking adhesive layer to obtain a light-concentrating diffusion plate. As shown in FIG. 3 (in the figure),
Although the brightness was slightly lower than that of Example 2, the viewing angle was slightly wide.

【0024】比較例1 実施例1で使用した集光性構造を有するシートを、光拡
散性構造を設けることなく、そのまま使用した。即ち、
拡散板を1枚使用し、その上にMD・TD方向に集光性
構造を有するシートを2枚重ねた常法の方式で、実施例
1、2、3と同様にその輝度及び視野特性を測定した。
結果を図3(図中)に示す。
Comparative Example 1 The sheet having the light-collecting structure used in Example 1 was used without providing a light-diffusing structure. That is,
The luminance and the visual field characteristics are determined in the same manner as in Examples 1, 2, and 3 by using a single diffusion plate and stacking two sheets having a light-collecting structure in the MD and TD directions on the diffusion plate. It was measured.
The results are shown in FIG.

【0025】[0025]

【発明の効果】以上詳説したように、本発明の集光性拡
散板は、液晶表示ディスプレイに使用されるバックライ
トに好適であり、下記の如き数多くの利点を有する。 従来使用されていた拡散板が不要となり、バックライ
ト組立工程が大巾に合理化される。 プリズムシートを重ね合わせることにより正面輝度が
向上し、かつ視野角も広くなる。 集光性構造を有する面のキズを目立たなくする効果が
あり、また、モアレ発生も防止され、重ね合わせる時の
密着防止効果がある。 実用上の強度が充分であり、経時変化が起こらない。 帯電防止処理を施すことにより、ちり、ほこりの付着
しにくく、ブロッキングを起こさない集光性拡散板が得
られ、バックライト組立時の作業効率が著しく向上す
る。
As described in detail above, the light-concentrating diffuser of the present invention is suitable for a backlight used in a liquid crystal display and has many advantages as described below. The diffusion plate used conventionally is not required, and the backlight assembling process is greatly streamlined. By overlapping the prism sheets, the front luminance is improved and the viewing angle is widened. This has the effect of making the scratches on the surface having the light-collecting structure inconspicuous, preventing the occurrence of moiré, and having the effect of preventing adhesion when overlapping. Practical strength is sufficient and no change over time occurs. By performing the antistatic treatment, it is possible to obtain a light-concentrating diffuser plate which does not easily adhere to dust and dust and does not cause blocking, and the working efficiency at the time of assembling the backlight is remarkably improved.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の実施態様を示す概略断面図である。FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

【図2】本発明の他の実施態様を示す概略断面図であ
る。
FIG. 2 is a schematic sectional view showing another embodiment of the present invention.

【図3】輝度と視野角の測定結果を示すグラフである。FIG. 3 is a graph showing measurement results of luminance and a viewing angle.

【符号の説明】[Explanation of symbols]

1 シート 2 断面が三角形状よりなる柱状物 3 集光性構造 4 短繊維 5 光拡散性構造 6 接着剤 7 シート 8 接着剤 9 植毛シート 10 光拡散性構造 11 接着剤 DESCRIPTION OF SYMBOLS 1 Sheet 2 Column-shaped object whose cross section is triangular 3 Light-collecting structure 4 Short fiber 5 Light diffusing structure 6 Adhesive 7 Sheet 8 Adhesive 9 Flocking sheet 10 Light diffusing structure 11 Adhesive

───────────────────────────────────────────────────── フロントページの続き (72)発明者 寺門 文也 大阪府大阪市住之江区安立4丁目13番18号 五洋紙工株式会社内 (72)発明者 小杉 巧 大阪府大阪市住之江区安立4丁目13番18号 五洋紙工株式会社内 (72)発明者 廣瀬 順吾 大阪府大阪市住之江区安立4丁目13番18号 五洋紙工株式会社内 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Bunya Terakado 4-13-18 Anritsu, Suminoe-ku, Osaka-shi, Osaka Inside Goyo Paper Works Co., Ltd. (72) Takumi Kosugi 4-chome, Adachi, Suminoe-ku, Osaka-shi 13-18 No.18 Goyo Paper Works Co., Ltd. (72) Inventor Jungo Hirose 4-13-18 Anatsu, Suminoe-ku, Osaka City, Osaka Prefecture Goyo Paper Works Co., Ltd.

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 シートの一方の面に、断面が三角形状よ
りなる柱状物を直線畝状に配列した集光性構造を有し、
その反対側面に繊維を植毛してなる光拡散性構造を有す
る集光性拡散板。
1. A light-collecting structure in which columnar objects having a triangular cross section are arranged in a straight ridge on one surface of a sheet,
A light-diffusing plate having a light-diffusing structure in which fibers are planted on the opposite side.
【請求項2】 光拡散性構造が、繊維を別のシートに植
毛してなる植毛シートの繊維の露出先端部を接着してな
る請求項1記載の集光性拡散板。
2. The light-concentrating diffusion plate according to claim 1, wherein the light-diffusing structure is formed by bonding exposed ends of the fibers of a flocking sheet formed by flocking fibers to another sheet.
【請求項3】 繊維が空気を含有する繊維である請求項
1又は2記載の集光性拡散板。
3. The light-concentrating diffuser according to claim 1, wherein the fibers are fibers containing air.
【請求項4】 光拡散性構造に帯電防止剤を含有させた
請求項1〜3のいずれか1項に記載の集光性拡散板。
4. The light-concentrating diffusion plate according to claim 1, wherein an antistatic agent is contained in the light-diffusing structure.
【請求項5】 請求項1〜4のいずれか1項に記載の集
光性拡散板の集光性構造を有する面上にプリズムシート
を重ねて設置したバックライト用照明パネル。
5. An illumination panel for a backlight, wherein a prism sheet is placed on a surface having a light-collecting structure of the light-collecting diffusion plate according to claim 1.
JP8239875A 1996-08-21 1996-08-21 Light-condensing diffusion plate and illumination panel for back light using that Withdrawn JPH1062785A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8239875A JPH1062785A (en) 1996-08-21 1996-08-21 Light-condensing diffusion plate and illumination panel for back light using that

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8239875A JPH1062785A (en) 1996-08-21 1996-08-21 Light-condensing diffusion plate and illumination panel for back light using that

Publications (1)

Publication Number Publication Date
JPH1062785A true JPH1062785A (en) 1998-03-06

Family

ID=17051187

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8239875A Withdrawn JPH1062785A (en) 1996-08-21 1996-08-21 Light-condensing diffusion plate and illumination panel for back light using that

Country Status (1)

Country Link
JP (1) JPH1062785A (en)

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Publication number Priority date Publication date Assignee Title
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JP2004247072A (en) * 2003-02-10 2004-09-02 Funai Electric Co Ltd Planer light source device
JP2006220934A (en) * 2005-02-10 2006-08-24 Fuji Photo Film Co Ltd Prism lens film and planar light emitting device
JP4677244B2 (en) * 2005-02-10 2011-04-27 富士フイルム株式会社 Prism lens film and planar light emitting device
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Effective date: 20031104