JPH1048430A - Light condensable diffusion plate, and illumination panel for back light using the same - Google Patents
Light condensable diffusion plate, and illumination panel for back light using the sameInfo
- Publication number
- JPH1048430A JPH1048430A JP8225903A JP22590396A JPH1048430A JP H1048430 A JPH1048430 A JP H1048430A JP 8225903 A JP8225903 A JP 8225903A JP 22590396 A JP22590396 A JP 22590396A JP H1048430 A JPH1048430 A JP H1048430A
- Authority
- JP
- Japan
- Prior art keywords
- light
- sheet
- beads
- diffusion plate
- air
- 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- Withdrawn
Links
Landscapes
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【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、特に中型以上の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、その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し、さらにこの
上にプリズムシートを重ねて設置することにより、より
高い正面輝度が得られる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 diffuser plate having a light-collecting structure and a lighting panel for a backlight using the same, and more particularly to a light guide plate for a backlight used for a liquid crystal display of a medium or larger size. The present invention relates to a backlight lighting panel having a function of diffusing a printed dot pattern to make it invisible, and further providing a higher front luminance by stacking a prism sheet thereon.
【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
に導光させる導光板と、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
かし乍ら、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では正面輝度が著しく低下する
か、又は拡散機能が低下して印刷ドットパターンが見え
るようになり、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 diffused to make it invisible. In addition, it is composed of a diffusion plate for obtaining uniform light, 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 rationalize the assembly process. However, when the diffusion plate is simply adhered to the entire back surface of the prism sheet to be integrated, the front luminance is remarkably reduced, or the diffusion function is reduced so that the printed dot pattern becomes visible, so that practical use is not possible. You can't get anything.
【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】[0004]
【発明が解決しようとする課題】本発明は、上記問題を
解消した、製造が容易で、導光板の印刷ドット・パター
ンが見えず、且つ正面輝度も高く、実用強度も充分であ
り、経時変化もない集光性拡散板及びこれを用いたバッ
クライト用照明パネルを提供するものである。DISCLOSURE OF THE INVENTION The present invention solves the above problems, is easy to manufacture, has no printed dot pattern on the light guide plate, has a high front luminance, has a sufficient practical strength, and has a long-term variation. The present invention provides a light-condensing diffusing plate having no light and a lighting panel for a backlight using the same.
【０００５】[0005]
【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、別
のシートに中空ビーズ及び／又は充実ビーズを接着して
なる光拡散性構造シートの該ビーズの突出部を接着して
なる、空気を含有した光拡散性構造を有する集光性拡散
板を、本発明の第２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、中空ビーズを主とする接着
層を設けて第２の空気を含有した光拡散性構造とし、更
にその表面に、別のシートに中空ビーズ及び／又は充実
ビーズを接着してなる光拡散性構造シートの該ビーズの
突出部を接着してなる、空気を含有した光拡散性構造を
有する集光性拡散板を、本発明の第３は、上記第１又は
第２の発明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. A light-diffusing structure having an air-containing light-diffusing structure formed by bonding a protrusion of a light-diffusing structure sheet formed by bonding hollow beads and / or solid beads to another sheet on a surface. In the second aspect of the present invention, the plate has a light-collecting structure in which columnar objects having a triangular cross section are arranged in a straight ridge on one surface of the sheet, and hollow beads are provided on the opposite surface. A light-diffusing structure comprising a second air-containing light-diffusing structure provided with a main adhesive layer, and further, hollow beads and / or solid beads bonded to another sheet on the surface thereof; Light-diffusing structure with an air-containing light-diffusing structure, which is formed by bonding the protrusions A third aspect of the present invention includes a backlight illumination panel in which a prism sheet is disposed on a surface having a light-collecting structure of the light-collecting diffuser plate of the first or second invention, respectively. Things.
【０００６】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、シート４に中空ビーズ及び／又は充実ビーズ５を接
着してなる光拡散性構造シート６の該ビーズ５の突出部
を接着剤８を介して接着してなる、空気を含有した光拡
散性構造７を有する。９は塗工用樹脂である。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, which has a light-concentrating structure 3 in which columnar objects 2 each having a triangular cross section are arranged in a straight ridge on one surface of a sheet 1. On the opposite surface, air is formed by bonding the protrusions of the beads 5 of the light diffusing structure sheet 6 formed by bonding hollow beads and / or solid beads 5 to the sheet 4 via an adhesive 8. It has a light diffusing structure 7 contained therein. 9 is a coating resin.
【０００７】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、中空ビーズ１０を主とする接着
層１１を設けて第２の空気を含有した光拡散性構造１２
とし、更にその表面に、シート４に中空ビーズ及び／又
は充実ビーズ５を接着してなる光拡散性構造シート６の
該ビーズ５の突出部を接着剤１３を介して接着してな
る、空気を含有した光拡散性構造７を有する。９は塗工
用樹脂である。この場合は、光拡散性構造７と第２の光
拡散性構造１２とで光拡散性構造１４を構成している。FIG. 2 shows another embodiment of the light-condensing diffusing plate of the present invention. A light-condensing structure in which columnar objects 2 each having a triangular cross section are arranged in a straight ridge on one surface of a sheet 1. 3 and an adhesive layer 11 mainly composed of hollow beads 10 is provided on the opposite surface to form a second air-containing light diffusing structure 12.
Further, on the surface thereof, air is formed by bonding the protrusions of the beads 5 of the light diffusing structure sheet 6 formed by bonding the hollow beads and / or the solid beads 5 to the sheet 4 via the adhesive 13. It has a light diffusing structure 7 contained therein. 9 is a coating resin. In this case, the light-diffusing structure 7 and the second light-diffusing structure 12 constitute a light-diffusing structure 14.
【０００８】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、空気を含有した層からなる光
拡散性構造７を具備する。The light-collecting structure 3 according to the present invention is a prism-shaped 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 7 composed of a layer containing air.
【０００９】空気を含有した光拡散性構造は、集光性構
造を有するシート１とは別の通常の平面状のシート４上
に、中空ビーズ及び／又は充実ビーズ５を、塗工用樹脂
９を使用して接着し光拡散性構造シート６を得、そのビ
ーズ５の突出部を接着剤８を用いて集光性構造３を有す
るシート１の反対側面に接着することにより設けられ
る。この場合、図２に示すように、あらかじめ、集光性
構造３を有するシート１の反対側面に中空ビーズ１０を
主とする接着層１１を設けて空気を含有した第２の光拡
散性構造とし、更にその表面に、前記光拡散性構造シー
ト６のビーズ５の突出部を接着剤１３を用いて接着させ
ることもできる。この場合には、前記したように、第２
の光拡散性構造と光拡散性構造７とで光拡散性構造１４
を構成している。このような構成とすることにより、集
光性構造を有する面上のキズを一層見えにくくする利点
がある。また、集光性構造を有するシート１の反対側
面、即ち、光拡散性構造７、１４を設ける面は、若干の
凹凸があってもよく、平滑であってもよい。The light-diffusing structure containing air is obtained by forming hollow beads and / or solid beads 5 on an ordinary flat sheet 4 different from the sheet 1 having a light-collecting structure, and applying a coating resin 9. The light-diffusing structure sheet 6 is obtained by bonding the light-diffusing structure sheet 6, and the protrusions of the beads 5 are bonded to the opposite side of the sheet 1 having the light-collecting structure 3 using an adhesive 8. In this case, as shown in FIG. 2, an adhesive layer 11 mainly composed of hollow beads 10 is provided on the opposite side of the sheet 1 having the light-collecting structure 3 in advance to form a second light diffusing structure containing air. Further, the protrusions of the beads 5 of the light diffusing structure sheet 6 can be adhered to the surface thereof using an adhesive 13. In this case, as described above, the second
The light diffusing structure 14 and the light diffusing structure 7
Is composed. With such a configuration, there is an advantage that scratches on the surface having the light-collecting structure are more difficult to see. Further, the opposite side surface of the sheet 1 having the light-collecting structure, that is, the surface on which the light diffusing structures 7 and 14 are provided may have some unevenness or may be smooth.
【００１０】中空ビーズはビーズの中に空気を含むもの
で、殻壁が無機系物質よりなるもの、又は有機系物質よ
りなるもののいずれも使用でき、無機系物質の例として
は、シリカ中空ビーズ、ガラス中空ビーズ等であり、有
機系物質の例としては、ガス遮断性の良好な重合物の殻
壁で低沸点炭化水素をマイクロカプセル化したバルーン
等が使用できる。また、これら無機系物質からなる中空
ビーズと有機系物質からなる中空ビーズとの併用も好適
である。The hollow beads contain air in the beads, and any of shell beads made of an inorganic substance or an organic substance can be used. Examples of the inorganic substance are silica hollow beads, Examples of the organic substance include glass hollow beads and the like, and a balloon in which a low-boiling hydrocarbon is microencapsulated with a shell wall of a polymer having good gas barrier properties can be used. It is also preferable to use a combination of these hollow beads made of an inorganic material and hollow beads made of an organic material.
【００１１】有機系物質からなる中空ビーズの好ましい
例としては、アクリルニトリル単体樹脂、アクリルニト
リルと塩化ビニリデンの共重合物などからなる殻壁をも
ち、低沸点炭化水素をマイクロカプセル化したバルーン
で、粒径が４〜８μｍの熱膨張性微小球が挙げられる。
この場合、塗工用樹脂を用いて光拡散性構造シートを作
製する方法が好適で、塗工した後、乾燥時に熱処理して
マイクロバルーン化される。発泡倍率は処理される温度
でコントロールできるが、通常の乾燥温度１１０〜１５
０℃で概ね５〜８倍（体積倍）に発泡される。ビーズと
しては、発泡粒径が１０〜２０μｍとなるアクリルニト
リル樹脂の中空バルーンが耐熱性及び強度面から好適で
ある。Preferable examples of the hollow beads made of an organic substance include balloons having a shell wall made of a single resin of acrylonitrile, a copolymer of acrylonitrile and vinylidene chloride, and microencapsulated with a low-boiling hydrocarbon. Heat-expandable microspheres having a particle size of 4 to 8 μm are exemplified.
In this case, a method of preparing a light-diffusing structural sheet using a coating resin is preferable. After coating, heat treatment is performed at the time of drying to form microballoons. The expansion ratio can be controlled by the treatment temperature, but the normal drying temperature is 110 to 15
It is foamed approximately 5 to 8 times (volume times) at 0 ° C. As beads, hollow balloons of acrylonitrile resin having a foamed particle size of 10 to 20 μm are preferable from the viewpoint of heat resistance and strength.
【００１２】他方、無機系物質の中空ビーズは、強度的
にすぐれ、さらに空気層をより多く作る点で、その粒径
は２０〜８０μｍが好適である。８０μｍを越えると均
一塗工が困難となり、また総厚みも厚くなり好ましくな
い。On the other hand, the hollow beads made of an inorganic material are preferably 20 to 80 μm in diameter in terms of excellent strength and more air layers. If it exceeds 80 μm, uniform coating becomes difficult, and the total thickness is undesirably large.
【００１３】中空ビーズを使用する利点は、ビーズその
ものに空気が含有されており、集光性構造を有するシー
トと光拡散性構造シートの貼り合わせにおいてより多く
の空気層が確保でき、また両面貼り合わせ面積を多くし
て空気層が減少しても中空ビーズの含有空気で補完され
ることにある。さらに、空気を含有する中空ビーズは、
光拡散効果にも優れている。この点、殻壁が多孔質から
なる中空シリカビーズ（例えば、商品名ゴットボールＢ
−６Ｃ、鈴木油脂工業株式会社製）は更に好適である。The advantage of using hollow beads is that the beads themselves contain air, so that more air layers can be secured in bonding the sheet having a light-collecting structure and the light-diffusing structure sheet. Even if the air space is reduced by increasing the area to be joined, the air content of the hollow beads is complemented by the air. Furthermore, hollow beads containing air are
Excellent light diffusion effect. In this regard, hollow silica beads whose shell wall is made of porous material (for example, trade name Gottball B
-6C, manufactured by Suzuki Yushi Kogyo Co., Ltd.) is more preferable.
【００１４】一方、充実ビーズはビーズの中に空気をほ
とんど、あるいは全く含まないもので、ビーズ強度が大
きい利点があり、これも無機系物質よりなるもの又は有
機系物質よりなるもの、いずれも使用できる。無機系物
質の例としては、ガラスビーズ、シリカビーズ、アルミ
ナビーズ等があり、有機系物質としては、合成樹脂より
なるビーズで、例えば、架橋アクリル樹脂ビーズ、ポリ
スチレンビーズ等が用いられる。充実ビーズの粒径は、
素材の無機系物質、有機系物質を問わず２０〜８０μｍ
が好適である。On the other hand, solid beads have little or no air in the beads, and have the advantage of high bead strength. Also used are those made of an inorganic material and those made of an organic material. it can. Examples of the inorganic substance include glass beads, silica beads, and alumina beads. Examples of the organic substance include beads made of a synthetic resin, such as cross-linked acrylic resin beads and polystyrene beads. The particle size of the solid beads
20-80μm irrespective of inorganic or organic material
Is preferred.
【００１５】中空ビーズ、充実ビーズ、さらに無機系物
質からなるビーズ、有機系物質からなるビーズは、いず
れも単独で使用してもよく、それらを混合して使用して
もよい。例えば、空気層をより多く作る点では中空ビー
ズが好ましいが、ビーズの強度の点では充実ビーズとの
併用が好ましい。尚、前記のビーズの粒径は、それぞれ
の平均的粒子径を示し、実際に使用されるビーズは、
大、小の分布をもったビーズが混在している。[0015] Hollow beads, solid beads, beads made of an inorganic material, and beads made of an organic material may be used alone or in combination. For example, hollow beads are preferred in terms of creating more air layers, but combined use with solid beads is preferred in terms of bead strength. Incidentally, the particle diameter of the beads indicates the average particle diameter of each, the beads actually used,
Beads with large and small distribution are mixed.
【００１６】光拡散性構造シート６を作製するために使
用したシート４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４のみを剥離してビーズ５
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、耐熱性及び剥
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）等のシートがよい。The sheet 4 used for producing the light diffusing structure sheet 6 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 that, only the sheet 4 is peeled off and the beads 5
Only the light-collecting structure may be left on the sheet 1. As described above, when peeling is performed later, a sheet such as polymethylpentene-1 (trade name: TPX, manufactured by Mitsui Petrochemical Industries, Ltd.) is preferable in terms of heat resistance and peelability.
【００１７】集光性構造を有するシート１の反対側に接
着層を介して直接中空ビーズを主とする層を設けて第２
の光拡散性構造とする場合の中空ビーズも特に制限はな
いが、この光拡散性構造の上に、更に光拡散性構造シー
トからなる光拡散性構造を設けることより無機系のビー
ズがよい。この場合の第２の光拡散性構造を設ける目的
は、集光性構造面上のキズをより目立たなくすることに
あり、そのためには拡散効果が大きい中空ビーズが有効
で、ビーズの粒径は３０〜４０μｍのものが好適であ
る。塗工量は、キズの大小により適宜決定される。ま
た、中空ビーズに充実ビーズを混合することによっても
調整可能である。On the opposite side of the sheet 1 having the light-collecting structure, a layer mainly composed of hollow beads is directly provided via an adhesive layer to form a second layer.
There is no particular limitation on the hollow beads when the light diffusing structure is used, but inorganic beads are preferred by further providing a light diffusing structure comprising a light diffusing structure sheet on the light diffusing structure. The purpose of providing the second light diffusing structure in this case is to make the scratches on the light-collecting structure less noticeable, and for that purpose, hollow beads having a large diffusion effect are effective, and the particle size of the beads is large. Those having a thickness of 30 to 40 μm are preferred. The coating amount is appropriately determined depending on the size of the scratch. It can also be adjusted by mixing solid beads with hollow beads.
【００１８】中空ビーズ、充実ビーズの塗工用樹脂は、
特に制限されないが、無色透明なタイプで溶剤系、エマ
ルジョン系のいずれもよく、また非架橋タイプでも架橋
タイプでもよく、架橋タイプは熱硬化、光硬化のいずれ
でもよい。しかし実用強度の点より、架橋タイプの樹脂
が好ましい。また、中空粒子ラテックス（例えば、商品
名Ｎｉｐｏｌ ＭＨ５０５５、日本ゼオン株式会社製）
もよい。The resin for coating hollow beads and solid beads is as follows:
Although not particularly limited, it is a colorless and transparent type, either a solvent type or an emulsion type, and may be a non-cross-linked type or a cross-linked type. The cross-linking type may be either thermosetting or photo-curing. However, from the viewpoint of practical strength, a crosslinked type resin is preferred. Also, hollow particle latex (for example, trade name Nipol MH5055, manufactured by Zeon Corporation)
Is also good.
【００１９】光拡散性構造シートのビーズの突出部を接
着させる接着剤は、特に制限されないが、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いが、粘
着剤では経時変化があり不適当である。この場合も、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Ｕ
Ｖキュアタイプが好ましい。塗工用樹脂と中空ビーズ及
び／又は充実ビーズの混合比及び塗工層の厚み、それに
よって生じる空気層の比率などは特に制限がなく、導光
板の反射ドット・パターン特性などにより適宜決定され
る。The adhesive for adhering the projecting portions of the beads of the light-diffusing structural sheet is not particularly limited, and it may be a colorless and transparent type, either a solvent-based or an emulsion-based. It is. Also in this case, a cross-linking type adhesive is preferable in terms of obtaining practical strength,
The type of photo-curing is not limited.
V cure type is preferred. The mixing ratio of the coating resin and the hollow beads and / or solid beads, the thickness of the coating layer, and the ratio of the air layer formed thereby are not particularly limited, and are appropriately determined according to the reflective dot / pattern characteristics of the light guide plate. .
【００２０】塗工層及び接着層を設ける方法は特に制限
はなく、本発明の目的からダイコーター、コンマコータ
ーが好適である。尚、塗工層、接着層はビーズを充分に
接着固定できる限り薄く設け、ビーズを塗工層、接着層
より突出させて光拡散性構造内に空気ができるだけ多く
含有されるようにするのが望ましい。The method for providing the coating layer and the adhesive layer is not particularly limited, and a die coater or a comma coater is suitable for the purpose of the present invention. The coating layer and the adhesive layer should be provided as thin as possible so that the beads can be sufficiently adhered and fixed, and the beads should protrude from the coating layer and the adhesive layer so that the light diffusing structure contains as much air as possible. desirable.
【００２１】さらに塗工用樹脂層に帯電防止剤を含有さ
せることにより光拡散性構造に帯電防止性を付与しても
よい。この目的に使用される帯電防止剤としては、好ま
しくは無色透明タイプがよく、しかも処理表面より容易
に脱落しないものがよい。本発明においてはビーズ表面
の凹凸面に帯電防止剤が担持されて、容易に脱落しにく
いものとなる。帯電防止剤の添加量は０．１〜１重量％
が好ましい。Further, an antistatic agent may be added to the coating resin layer to impart antistatic properties to the light diffusing structure. As the antistatic agent used for this purpose, a colorless and transparent type is preferred, and those which do not easily fall off the treated surface are preferred. In the present invention, the antistatic agent is carried on the uneven surface of the bead surface, so that the beads are not easily dropped off. 0.1 to 1% by weight of antistatic agent
Is preferred.
【００２２】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 an illumination panel for a backlight. 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.
【００２３】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
拡散板が不要となり、さら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では正面輝度が向上す
ると同時に視野角も広がるという特徴を有している。ま
た、空気層によりモアレ防止効果、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 diffusion plate of the present invention has sufficient strength for practical use, does not change with time, eliminates the need for a conventional diffusion plate, and further has a backlight panel in which prism sheets are stacked and installed. Has a feature that the viewing angle is widened at the same time as the front luminance is improved. Further, the air layer has an effect of preventing moiré, and further has an effect of making scratches on the surface having the light-collecting structure inconspicuous.
Furthermore, by performing an antistatic treatment, charging of the light-collecting diffuser plate is prevented, dust and dust are prevented from adhering, blocking is prevented, and workability in assembling the backlight is greatly improved.
【００２４】[0024]
【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°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、実際の使用時に目視で行なっ
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. Also, the short side direction (perpendicular to the cold cathode tubes) of the light-concentrating diffuser is called the Y direction. Viewing angle. Confirmation of the printed dot pattern of the light guide plate was visually performed during actual use.
【００２５】実施例１ 中空ビーズとして、アクリルニトリル樹脂を殻壁とした
熱膨張性中空ビーズ「マツモトマイクロスフェアー：Ｆ
−８０ＧＳＤ、（松本油脂株式会社製、平均粒子径４〜
７μｍ）２．６部、充実ビーズとして、架橋アクリル樹
脂「アクポリマーＢＭ３０Ｘ−３０」（積水化成品工業
株式会社、平均粒子径３０μｍ）７．６部、塗工用樹脂
としてアクリル系エマルジョン樹脂ＥＫ−１００５、
（サイデン化学株式会社製、固型分３９％）５４部にエ
ポキシ系硬化剤「Ａ−５２」（サイデン化学株式会社
製）６部を混合し、さらに粘度調整用としてエタノール
２９．８部を添加し光拡散性構造用の塗工液を調整し
た。一方、集光性構造を有するシートとして、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５０μｍ、その頂角が９０°よりなる柱状物を５０
μｍピッチで直線畝状に配列したプリズム状シートで厚
さ１６０μｍのものを準備した。さらに、光拡散性構造
シート用のシートとして、２軸延伸のミラー・透明、表
面処理なし、厚さ１６μｍのポリエステルシートを別に
準備した。ついで、前記ポリエステルシート上に光拡散
性構造用の塗工液を塗工量６ｇ／m2（乾燥重量）になる
ように塗工し、１３０℃で２分乾燥と同時に中空ビーズ
を熱膨張により発泡させ光拡散性構造シートを作成し
た。他方、集光性構造を有するシートの裏面にＵＶ硬化
性の樹脂としてアクリル・エポキシ樹脂タイプの「Thre
e Bond ３１０２」（株式会社スリーボンド、無溶剤タ
イプ）を４ｇ／m2塗工し、その上に、前記光拡散性構造
シートの中空ビーズ層を重ね合わせた後、紫外線照射に
より、樹脂の硬化を確認すると同時に一体化させ集光性
拡散板を作製した。Example 1 As hollow beads, heat-expandable hollow beads having a shell wall made of acrylonitrile resin "Matsumoto Microsphere: F
-80 GSD, (Matsumoto Yushi Co., Ltd., average particle size 4 to
2.6 parts, crosslinked acrylic resin "Akupolymer BM30X-30" (Sekisui Chemical Co., Ltd., average particle diameter 30 [mu] m) as solid beads, 7.6 parts, acrylic emulsion resin EK- as a coating resin 1005,
To 54 parts (manufactured by Seiden Chemical Co., Ltd., solid content 39%), 6 parts of an epoxy-based curing agent "A-52" (manufactured by Seiden Chemical Co., Ltd.) are mixed, and 29.8 parts of ethanol are added for viscosity adjustment. Then, a coating liquid for a light diffusing structure was prepared. On the other hand, as a sheet having a light-collecting structure, a columnar material having a base of 50 μm and an apex angle of 90 ° with a triangular cross-section made of a polycarbonate-based resin having an isosceles triangle is used.
A prism-like sheet having a thickness of 160 μm, which was arranged in a linear ridge at a pitch of μm, was prepared. Further, as a sheet for the light diffusing structure sheet, a biaxially stretched mirror / transparent polyester sheet having no surface treatment and a thickness of 16 μm was separately prepared. Then, a coating liquid for a light diffusing structure was applied on the polyester sheet so as to have a coating amount of 6 g / m 2 (dry weight), and dried at 130 ° C. for 2 minutes, and the hollow beads were thermally expanded. The light-diffusing structural sheet was foamed. On the other hand, acrylic-epoxy resin type “Thre
e Bond 3102 "(ThreeBond Co., Ltd., solvent-free type) is coated at 4 g / m 2 , and the hollow bead layer of the light diffusing structure sheet is overlaid thereon. At the same time, the light-condensing diffusing plate was integrated.
【００２６】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、正面輝度が著しく高く、良好な
集光性を示し、かつ視野面も広いものであった。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。The luminance and the visual field characteristics when the prism sheet prepared separately was overlapped on the prism-shaped surface of the obtained light-diffusing diffuser plate were measured. The results are shown in FIG. 3, and this light-diffusing diffuser was shown as Comparative Example 1 described below.
The front luminance was remarkably high, good light-collecting property was shown, and the field surface was wide as compared with the case where a total of three sheets of the diffusion plate and the prism sheet in the MD and TD directions were overlapped. 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.
【００２７】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。The MD direction refers to a 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 TD direction is parallel to the cold-cathode tube. It refers to the direction in which the triangular prism is located.
【００２８】実施例２ 実施例１と同様の集光性構造を有するシート（プリズム
状の方向はＭＤ方向）を準備した。その集光性構造体の
反対側に、第２の光拡散性構造を設けるため、中空のシ
リカビーズとして「ゴッドボールＦ−４０Ｃ」（鈴木油
脂工業株式会社製、平均粒径４０μｍ）を、実施例１で
使用したと同様の架橋剤を混合した塗工用樹脂８９．５
部に１０部添加し、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、固型分９９
％）０．５部添加した塗工液を、６ｇ／m2（乾燥重量）
塗工し、第２の光拡散性構造をもつ集光性構造を有する
シートを得た。別に光拡散性構造用として、前記の「ゴ
ッドボールＦ−４０Ｃ」を１５部、さらに中空のシリカ
ビーズである「ゴッドボールＢ−６Ｃ」（鈴木油脂工業
株式会社製、平均粒径２．０〜２．５μｍ）１５部に、
実施例１で使用した架橋剤を混合した塗工用樹脂７０部
を混合し、剥離性を有する「ＴＰＸ」（三井石油化学工
業株式会社製）の５０μｍフィルム上に８ｇ／m2（乾燥
重量）塗工した。次いでそのビーズ突出部と前記第２の
光拡散性構造とを、実施例１で使用した紫外線硬化樹脂
を使用し、実施例１と同様の方法で貼り合わせた。貼り
合わせ一体化した後、「ＴＰＸ」フィルムのみを剥離、
除去し、集光性拡散板を作製した。Example 2 A sheet having the same light-collecting structure as in Example 1 (prism-shaped direction is MD direction) was prepared. In order to provide a second light diffusing structure on the opposite side of the light-collecting structure, “Godball F-40C” (manufactured by Suzuki Yushi Kogyo Co., Ltd., average particle size 40 μm) was implemented as hollow silica beads. Coating resin 89.5 mixed with the same crosslinking agent as used in Example 1
10 parts by weight, and as an antistatic agent, “Chemistat 3500” (manufactured by Sanyo Chemical Industries, Ltd .;
%) Of the coating liquid added with 0.5 part was added to 6 g / m 2 (dry weight).
After coating, a sheet having a light-collecting structure having a second light-diffusing structure was obtained. Separately, for a light diffusing structure, 15 parts of the above “Godball F-40C”, and “Godball B-6C” which is a hollow silica bead (manufactured by Suzuki Yushi Kogyo Co., Ltd .; 2.5 μm) 15 parts,
70 g of the coating resin mixed with the cross-linking agent used in Example 1 was mixed, and 8 g / m 2 (dry weight) was applied on a 50 μm film of “TPX” (manufactured by Mitsui Petrochemical Co., Ltd.) having releasability. Coated. Next, the bead protrusions and the second light diffusing structure were bonded in the same manner as in Example 1 using the ultraviolet curing resin used in Example 1. After lamination and integration, peel off only the “TPX” film,
This was removed to produce a light-concentrating diffusion plate.
【００２９】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枚重ねたものとの比較して、
正面輝度は同等かそれ以上を示し、集光性構造面の表面
キズも確認できないものであった。導光板の印刷ドット
・パターンも見えなかった。また、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
認められないものであった。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。The TD direction of a separately prepared prism sheet was overlapped on the prism-shaped surface of the obtained light-diffusing diffuser, 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, and compared with those obtained by laminating a diffusion plate and two untreated prism sheets shown as Comparative Example 1 below,
The front luminance was equal to or higher than that, and no surface flaw on the light-collecting structure surface was confirmed. No printed dot pattern on the light guide was visible. Further, in a practical test similar to that of Example 1, it had sufficient strength for practical use, and no change with time was observed. Furthermore, it was confirmed that dust and dust were hard to adhere due to the effect of adding the antistatic agent.
【００３０】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。この場
合は、拡散板を別に使用し、その上にＭＤ・ＴＤ方向に
シートを２枚重ねて、実施例１、２と同様に、その輝度
及び視野特性を測定した。結果を図３に示した。Comparative Example 1 The sheet having a light-collecting structure used in Example 1 was used without providing a light-diffusing structure. In this case, a diffusion plate was separately used, and two sheets were stacked thereon in the MD and TD directions, and the luminance and the visual field characteristics were measured as in Examples 1 and 2. The results are shown in FIG.
【００３１】[0031]
【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。 実用上の強度が充分であり、経時変化が起こらない。 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。 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. Practical strength is sufficient and no change over time occurs. 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. 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.
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 シート ５ 中空及び／又は充実ビーズ ６ 光拡散性構造シート ７ 空気を含有した光拡散性構造 ８ 接着剤 ９ 塗工用樹脂 １０ 中空ビーズ １１ 接着剤 １２ 第２の空気を含有した光拡散性構造 １３ 接着剤 １４ 空気を含有した光拡散性構造 REFERENCE SIGNS LIST 1 sheet 2 columnar object having a triangular cross section 3 light collecting structure 4 sheet 5 hollow and / or solid beads 6 light diffusing structure sheet 7 light diffusing structure containing air 8 adhesive 9 coating resin 10 hollow Bead 11 Adhesive 12 Light diffusing structure containing second air 13 Adhesive 14 Light diffusing structure containing air
フロントページの続き (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 大原 柊三 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Continued on the front page. (72) Inventor Takumi Kosugi 4-13-18 Anritsu, Suminoe-ku, Osaka-shi, Osaka Inside Goyo Paper Works Co., Ltd. No. Goyo Paper Works Co., Ltd.
Claims (4)
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、別のシートに中空ビーズ及び／又は
充実ビーズを接着してなる光拡散性構造シートの該ビー
ズの突出部を接着してなる、空気を含有した光拡散性構
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,
On the opposite surface, a light-diffusing structure in which hollow beads and / or solid beads are bonded to another sheet, and the protrusions of the beads of the light-diffusing structure sheet are bonded, has an air-containing light-diffusing structure. Concentrating diffuser.
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、中空ビーズを主とする接着層を設け
て第２の空気を含有した光拡散性構造とし、更にその表
面に、別のシートに中空ビーズ及び／又は充実ビーズを
接着してなる光拡散性構造シートの該ビーズの突出部を
接着してなる、空気を含有した光拡散性構造を有する集
光性拡散板。2. A light-collecting structure in which columnar objects having a triangular cross section are arranged in a straight ridge on one surface of the sheet,
On the opposite surface, an adhesive layer mainly composed of hollow beads is provided to form a second air-containing light diffusing structure, and further, the hollow beads and / or solid beads are adhered to another sheet on the surface. A light-concentrating diffusion plate having a light-diffusing structure containing air, wherein the light-diffusing structure sheet is formed by bonding the projecting portions of the beads.
止剤を含有させた請求項１又は２記載の集光性拡散板。3. The light-concentrating diffusion plate according to claim 1, wherein the light-diffusing structural layer containing air contains an antistatic agent.
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。4. 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.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8225903A JPH1048430A (en) | 1996-08-07 | 1996-08-07 | Light condensable diffusion plate, and illumination panel for back light using the same |
| KR1019970028537A KR19980018165A (en) | 1996-06-28 | 1997-06-28 | Light diffusion and condensing plates, and lighting panels for backlight using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8225903A JPH1048430A (en) | 1996-08-07 | 1996-08-07 | Light condensable diffusion plate, and illumination panel for back light using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1048430A true JPH1048430A (en) | 1998-02-20 |
Family
ID=16836701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8225903A Withdrawn JPH1048430A (en) | 1996-06-28 | 1996-08-07 | Light condensable diffusion plate, and illumination panel for back light using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1048430A (en) |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20031007 |