JPH08201606A - Light control sheet - Google Patents
Light control sheetInfo
- Publication number
- JPH08201606A JPH08201606A JP1263895A JP1263895A JPH08201606A JP H08201606 A JPH08201606 A JP H08201606A JP 1263895 A JP1263895 A JP 1263895A JP 1263895 A JP1263895 A JP 1263895A JP H08201606 A JPH08201606 A JP H08201606A
- Authority
- JP
- Japan
- Prior art keywords
- resin sheet
- light control
- transparent
- control sheet
- sheet
- 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.)
- Pending
Links
Landscapes
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、板状導光体を利用した
面状発光照明装置より発せられる光の拡散を行なう光制
御シートに関し、特に、液晶表示装置に用いられる光制
御シートに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control sheet for diffusing light emitted from a planar light emitting lighting device using a plate-shaped light guide, and more particularly to a light control sheet used for a liquid crystal display device.
【０００２】[0002]
【従来の技術】従来、この種の光制御シートは、透明樹
脂シート中に屈折率の異なる透明な微小粒体の光拡散剤
を混入したものや微小粒体の光拡散剤が混入された樹脂
を透明樹脂シートの表面にコーティングしたものが知ら
れている。また、強度を向上したり、難燃性を向上する
ため、微小粒体の光拡散剤に代えて、微小繊維状物の光
拡散剤を用いた光制御シートが、たとえば特開平１−２
０９４０２号公報に開示されている。また、微小繊維状
物の光拡散剤を用いて、光制御シートの出射光特性に異
方性を持たせ、所定の方向により多くの光を出射するよ
うにした、いわゆる異方性光制御シートが、たとえば特
開平４−３１４５２２号公報に開示されている。2. Description of the Related Art Heretofore, this type of light control sheet has been prepared by mixing a transparent resin sheet with a transparent fine particle light diffusing agent having a different refractive index or a resin containing a fine particle light diffusing agent. It is known that the surface of a transparent resin sheet is coated with. Further, in order to improve the strength and the flame retardancy, a light control sheet using a light diffusing agent of fine fibrous material instead of the light diffusing agent of fine particles is disclosed in, for example, JP-A 1-2.
It is disclosed in Japanese Patent Publication No. 09402. Further, a so-called anisotropic light control sheet, in which the light diffusing agent of the fine fibrous material is used to impart anisotropy to the outgoing light characteristics of the light control sheet so that more light is emitted in a predetermined direction, For example, it is disclosed in Japanese Patent Laid-Open No. 4-314522.
【０００３】[0003]
【発明が解決しようとする課題】ところが、前述した異
方性光制御シートにおいては、次のような問題点がある
ことが本発明者により見い出された。すなわち、異方性
光制御シートでは、微小粒体の光拡散剤を混入した透明
樹脂シートを延伸加工して、微小粒体の光拡散剤を繊維
状に形成している。ところが、延伸加工を行なうために
は、透明樹脂シートの成分と微小粒体の成分とのＴｇを
非常に近くしなければならないため、透明樹脂シートの
成分および微小粒体の成分の選択性が制限される。However, the present inventor has found that the above-mentioned anisotropic light control sheet has the following problems. That is, in the anisotropic light control sheet, the transparent resin sheet mixed with the light diffusing agent of fine particles is stretched to form the light diffusing agent of fine particles in a fibrous shape. However, in order to perform the stretching process, the Tg of the transparent resin sheet component and the Tg of the fine particle component must be very close to each other, so that the selectivity of the transparent resin sheet component and the fine particle component is limited. To be done.
【０００４】つまり、透明樹脂シートを柔らかく、微小
粒体を硬くする温度下で、延伸加工を行なうと、微小粒
体は繊維状に形成されない。また、透明樹脂シートを硬
くする温度下では、たとえ微小粒体が柔らかくとも透明
樹脂シート自体が延伸加工時に破けてしまう。従って、
透明樹脂シートが柔らかい延伸可能な温度範囲にあると
き、微小粒体も柔らかい延伸可能な状態でなければなら
ない。このように、透明樹脂シートと微小粒体の成分の
組み合わせが限定されるため、光制御シートが安価な材
料で製造できなくなり、コストアップとなる。加えて、
充分な拡散を得る材料の組み合わせが実現できなくな
る。また、延伸加工を行なうため、歩留りが悪くなり、
コストアップとなる。That is, when the transparent resin sheet is stretched at a temperature at which the transparent resin sheet is soft and the fine particles are hard, the fine particles are not formed into a fibrous shape. Further, under the temperature at which the transparent resin sheet is hardened, even if the fine particles are soft, the transparent resin sheet itself is broken during the stretching process. Therefore,
When the transparent resin sheet is in the soft stretchable temperature range, the fine particles also have to be in the soft stretchable state. In this way, the combination of the transparent resin sheet and the components of the fine particles is limited, so that the light control sheet cannot be manufactured with an inexpensive material, resulting in an increase in cost. in addition,
It becomes impossible to realize a combination of materials that obtains sufficient diffusion. In addition, since the drawing process is performed, the yield becomes poor,
The cost will increase.
【０００５】本発明の目的は、前述した問題点に鑑み、
透明樹脂シートと光拡散剤の成分の組み合わせを自由に
することができ、コストを低減することができる光制御
シートを提供することにある。本発明の前記ならびにそ
の他の目的と新規な特徴は、本明細書の記述および添付
図面から明らかになるであろう。The object of the present invention is to solve the above problems.
An object of the present invention is to provide a light control sheet that can freely combine the components of the transparent resin sheet and the light diffusing agent and can reduce the cost. The above and other objects and novel features of the present invention will be apparent from the description of the present specification and the accompanying drawings.
【０００６】[0006]
【課題を解決するための手段】本願において開示される
発明の概要を簡単に説明すれば、以下のとおりである。
本発明の光制御シートは、透明樹脂シートに、少なくと
も１種類以上の透明な有機材または無機材からなる多角
柱形状の繊維を秩序よく、たとえば同一方向に配列した
布を、埋設または貼着したものである。The outline of the invention disclosed in the present application will be briefly described as follows.
The light control sheet of the present invention is obtained by burying or adhering to a transparent resin sheet a polygonal prismatic fiber made of at least one kind of transparent organic material or inorganic material in an orderly manner, for example, arranged in the same direction. It is a thing.
【０００７】[0007]
【作 用】前述した手段によれば、多角柱形状の繊維を
秩序よく配列した繊維状物の布を、透明樹脂シートに埋
設または貼着したので、透明樹脂シートと繊維状物の成
分の組み合わせが自由になると共に、光制御シートが延
伸加工なしで容易に得られる。[Operation] According to the above-mentioned means, since the fibrous material cloth in which the polygonal columnar fibers are arranged in an orderly manner is embedded or attached to the transparent resin sheet, the combination of the transparent resin sheet and the components of the fibrous material is combined. And the light control sheet can be easily obtained without stretching processing.
【０００８】[0008]
【実施例】以下、本発明の実施例を図１〜図４に基づい
て詳細に説明する。 〔実施例１〕図１は本発明の第１実施例である光制御シ
ートの斜視図を示す。図１において、光制御シートは、
透明樹脂シート、たとえば１００重量部のポリカーボネ
ート樹脂シート１上に、縦方向に１０重量部の多角柱形
状、たとえば三角柱形状の光拡散剤であるアクリル繊維
２を同一方向に配列し、横方向にポリカーボネート樹脂
シート１と同じ成分のポリカーボネート繊維３を同一方
向に配列して形成された布４を貼り合わせた。このと
き、アクリル繊維２の一辺ａ1 の寸法を１０μｍとし
た。また、アクリル繊維２は縦方向または横方向のどち
らか一方に配列すればよい。Embodiments of the present invention will be described in detail below with reference to FIGS. [Embodiment 1] FIG. 1 is a perspective view of a light control sheet according to a first embodiment of the present invention. In FIG. 1, the light control sheet is
On a transparent resin sheet, for example, 100 parts by weight of a polycarbonate resin sheet 1, 10 parts by weight of a polygonal prism shape, for example, a triangular prism shape of a light diffusing agent acrylic fiber 2 are arranged in the same direction in the vertical direction, and the polycarbonate is transversely arranged. A cloth 4 formed by arranging polycarbonate fibers 3 having the same components as the resin sheet 1 in the same direction was attached. At this time, the size of one side a 1 of the acrylic fiber 2 was set to 10 μm. Further, the acrylic fibers 2 may be arranged in either the vertical direction or the horizontal direction.
【０００９】〔実施例２〕図２は本発明の第２実施例で
ある光制御シートの斜視図を示す。図２によれば、縦方
向に１０重量部の三角柱形状のアクリル繊維２を同一方
向に配列し、横方向にポリカーボネート繊維３を同一方
向に配列して形成した布４を、１００重量部のポリカー
ボネート樹脂シート１の表面に貼り合わせると共に、ポ
リカーボネート樹脂シート１内に埋め込み、厚さ１２０
μｍの光制御シートを得た。このとき、アクリル繊維２
の一辺ａ2 の寸法を１０μｍとした。[Second Embodiment] FIG. 2 is a perspective view of a light control sheet according to a second embodiment of the present invention. According to FIG. 2, 10 parts by weight of triangular prism-shaped acrylic fibers 2 are arranged in the same direction in the vertical direction, and polycarbonate fibers 3 are arranged in the horizontal direction in the same direction. The resin sheet 1 is attached to the surface of the resin sheet 1 and embedded in the polycarbonate resin sheet 1 to have a thickness of 120.
A light control sheet of μm was obtained. At this time, acrylic fiber 2
The dimension of one side a 2 was 10 μm.
【００１０】〔実施例３〕図３は本発明の第３実施例に
係る光制御シートの概略構成図である。図３に示すよう
に、縦方向にアクリル繊維２およびポリカーボネート繊
維３を配列し、横方向にポリカーボネート繊維３を同一
方向に配列して布５を形成し、この布５をポリカーボネ
ート樹脂シート１に埋設することで、微小のアクリル繊
維２が所々に配置された光制御シートを得た。[Third Embodiment] FIG. 3 is a schematic configuration diagram of a light control sheet according to a third embodiment of the present invention. As shown in FIG. 3, acrylic fibers 2 and polycarbonate fibers 3 are arranged in the vertical direction, and polycarbonate fibers 3 are arranged in the horizontal direction in the same direction to form a cloth 5. The cloth 5 is embedded in the polycarbonate resin sheet 1. By doing so, a light control sheet in which minute acrylic fibers 2 were arranged in some places was obtained.
【００１１】〔比較例〕ポリカーボネート樹脂１００重
量部に、粒径２０μｍのＰＶＤＦパウダーを１０重量部
分散配合し、横一軸延伸して光制御シートを得た。この
光制御シートおよび前述した実施例１、２、３の光制御
シートを液晶表示装置のバックライトモジュールに配置
して、同様の方法および条件により評価を行なった。評
価結果を次表に示す。Comparative Example 10 parts by weight of PVDF powder having a particle size of 20 μm was dispersed and mixed in 100 parts by weight of a polycarbonate resin, and laterally uniaxially stretched to obtain a light control sheet. The light control sheet and the light control sheets of Examples 1, 2, and 3 described above were placed in a backlight module of a liquid crystal display device, and evaluation was performed by the same method and conditions. The evaluation results are shown in the following table.
【００１２】[0012]
【表１】 [Table 1]
【００１３】上表に明らかなように、本実施例の光制御
シートは、布４、５をポリカーボネート樹脂シート１等
の透明樹脂シートに埋設または貼着することにより形成
されるので、透明樹脂シートと繊維状物との成分の組み
合わせが自由に決定され、より安価な材料での製造が可
能となる。また、生産時における歩留りが向上し、光制
御シート表面の凹凸により、液晶表示装置において、正
面輝度が高く、明るい画面を得る。また、ドット見えも
良好である。以上、本発明者によってなされた発明を、
実施例に基づき具体的に説明したが、本発明は、前記実
施例に限定されるものではなく、その要旨を逸脱しない
範囲で、種々変更可能であることは、言うまでもない。As is apparent from the above table, the light control sheet of this embodiment is formed by embedding or adhering the cloths 4 and 5 to the transparent resin sheet such as the polycarbonate resin sheet 1 or the like. It is possible to freely determine the combination of the components of the and the fibrous material, and it is possible to manufacture with a cheaper material. In addition, the yield at the time of production is improved, and due to the unevenness of the surface of the light control sheet, in the liquid crystal display device, the front brightness is high and a bright screen is obtained. The dot appearance is also good. As described above, the invention made by the present inventor
Although the present invention has been specifically described based on the embodiments, it goes without saying that the present invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention.
【００１４】本実施例では、透明樹脂シートにポリカー
ボネート樹脂を用いたが、透明な素材であれば、必ずし
もポリカーボネート樹脂に限定されず、たとえば、ポリ
エチレン、エチレン−プロピレン共重合体、エチレン−
酢酸ビニル共重合体およびその部分または全部ケン化
物、エチレン−アクリル酸エチル共重合体、エチレン−
メタクリル酸メチル共重合体、エチレン−酢酸ビニル−
メタクリル酸メチル共重合体、ポリプロピレン、プロピ
レン−α−オレフィン共重合体等のオレフィン系樹脂、
ポリ塩化ビニル樹脂等の塩化ビニル系樹脂、アクリロニ
トリル−スチレン共重合体等のアクリロニトリル系樹
脂、ポリスチレン、スチレン−メタクリル酸メチル共重
合体等のスチレン系樹脂、ポリアクリル酸エチル等のア
クリル酸エステル重合体、ポリメタクリル酸メチル等の
メタクリル酸エステル重合体、それらの共重合体や他の
共重合成分を加えた（メタ）アクリル酸エステル系樹
脂、ポリエチレンテレフタレート等のポリエステル樹
脂、ナイロン等のポリアミド樹脂、ポリカーボネート樹
脂、エチルセルロース、アセチルセルロース等のセルロ
ース樹脂、ポリウレタン系樹脂、シリコン系樹脂等を用
いてもよい。また、本実施例では、三角柱形状のアクリ
ル繊維２を用いたが、図４に示すように、四角柱形状の
アクリル繊維６を用いても同様の効果が期待できる。In this embodiment, a polycarbonate resin is used for the transparent resin sheet, but it is not limited to the polycarbonate resin as long as it is a transparent material. For example, polyethylene, ethylene-propylene copolymer, ethylene-
Vinyl acetate copolymer and partially or completely saponified product thereof, ethylene-ethyl acrylate copolymer, ethylene-
Methyl methacrylate copolymer, ethylene-vinyl acetate-
Olefin resins such as methyl methacrylate copolymer, polypropylene, propylene-α-olefin copolymer,
Vinyl chloride resin such as polyvinyl chloride resin, acrylonitrile resin such as acrylonitrile-styrene copolymer, polystyrene, styrene resin such as styrene-methyl methacrylate copolymer, acrylic ester polymer such as polyethyl acrylate , Methacrylic acid ester polymers such as polymethylmethacrylate, (meth) acrylic acid ester-based resins containing copolymers thereof and other copolymerization components, polyester resins such as polyethylene terephthalate, polyamide resins such as nylon, polycarbonate Resins, cellulose resins such as ethyl cellulose and acetyl cellulose, polyurethane resins, silicone resins and the like may be used. Further, in this embodiment, the triangular prism-shaped acrylic fiber 2 is used, but as shown in FIG. 4, the same effect can be expected by using the quadrangular prism-shaped acrylic fiber 6.
【００１５】[0015]
【発明の効果】本発明の光制御シートによれば、多角柱
形状の繊維が秩序よく配列された繊維状物の布を、透明
樹脂シートに埋設または貼着したので、透明樹脂シート
と繊維状物の成分の組み合わせが自由になると共に、延
伸加工を省略することができる。従って、液晶表示装置
の輝度および画質感を向上させることができる光制御シ
ートを歩留りよく低コストで得ることができる。According to the light control sheet of the present invention, a cloth of a fibrous material in which polygonal prismatic fibers are arranged in an orderly manner is embedded or adhered to a transparent resin sheet. The combination of the components of the product becomes free, and the stretching process can be omitted. Therefore, the light control sheet capable of improving the brightness and the image quality of the liquid crystal display device can be obtained with high yield and at low cost.
【図１】本発明の第１実施例である光制御シートの斜視
図。FIG. 1 is a perspective view of a light control sheet that is a first embodiment of the present invention.
【図２】本発明の第２実施例である光制御シートの斜視
図。FIG. 2 is a perspective view of a light control sheet that is a second embodiment of the present invention.
【図３】本発明の第３実施例である光制御シートの概略
構成図。FIG. 3 is a schematic configuration diagram of a light control sheet that is a third embodiment of the present invention.
【図４】本発明の光制御シートの四角柱形状の繊維を示
す部分斜視図。FIG. 4 is a partial perspective view showing a quadrangular prism-shaped fiber of the light control sheet of the present invention.
１…ポリカーボネート樹脂シート ２、６…アクリル繊維 ３…ポリカーボネート繊維 ４、５…布 1 ... Polycarbonate resin sheet 2, 6 ... Acrylic fiber 3 ... Polycarbonate fiber 4, 5 ... Cloth
Claims (2)
たは無機材からなる多角柱形状の繊維が秩序よく配列さ
れた布を、透明樹脂シートに埋設または貼着したことを
特徴とする光制御シート。1. A light control sheet comprising a transparent resin sheet and a cloth in which polygonal prism-shaped fibers made of at least one kind of transparent organic material or inorganic material are arranged in order. .
特徴とする請求項１記載の光制御シート。2. The light control sheet according to claim 1, wherein the fibers are arranged in the same direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1263895A JPH08201606A (en) | 1995-01-30 | 1995-01-30 | Light control sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1263895A JPH08201606A (en) | 1995-01-30 | 1995-01-30 | Light control sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08201606A true JPH08201606A (en) | 1996-08-09 |
Family
ID=11810922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1263895A Pending JPH08201606A (en) | 1995-01-30 | 1995-01-30 | Light control sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08201606A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001183642A (en) * | 1999-12-24 | 2001-07-06 | Toppan Printing Co Ltd | Multi-prism sheet and liquid crystal display device using the same |
| JP2006106051A (en) * | 2004-09-30 | 2006-04-20 | Sony Corp | Light transmissive sheet |
| US11338543B2 (en) * | 2017-09-01 | 2022-05-24 | Benecke-Kaliko Ag | Light-permeable multi-layer composite film |
-
1995
- 1995-01-30 JP JP1263895A patent/JPH08201606A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001183642A (en) * | 1999-12-24 | 2001-07-06 | Toppan Printing Co Ltd | Multi-prism sheet and liquid crystal display device using the same |
| JP2006106051A (en) * | 2004-09-30 | 2006-04-20 | Sony Corp | Light transmissive sheet |
| JP4613566B2 (en) * | 2004-09-30 | 2011-01-19 | ソニー株式会社 | Light transmission sheet |
| US11338543B2 (en) * | 2017-09-01 | 2022-05-24 | Benecke-Kaliko Ag | Light-permeable multi-layer composite film |
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