JP2002221607A - Light scattering plate - Google Patents
Light scattering plateInfo
- Publication number
- JP2002221607A JP2002221607A JP2001016715A JP2001016715A JP2002221607A JP 2002221607 A JP2002221607 A JP 2002221607A JP 2001016715 A JP2001016715 A JP 2001016715A JP 2001016715 A JP2001016715 A JP 2001016715A JP 2002221607 A JP2002221607 A JP 2002221607A
- Authority
- JP
- Japan
- Prior art keywords
- light
- scattering plate
- light scattering
- plate
- hollow glass
- 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
- Liquid Crystal (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、光散乱板に関し、
さらに詳しくは、液晶表示素子などの光学素子のバック
ライトからの光を均一に散乱させ且つ出光させる光散乱
板に関する。TECHNICAL FIELD The present invention relates to a light scattering plate,
More specifically, the present invention relates to a light scattering plate for uniformly scattering and emitting light from a backlight of an optical element such as a liquid crystal display element.
【０００２】[0002]
【従来の技術】従来、バックライト型の液晶表示素子
は、図１及び図２に示すように不図示の光源からの光源
光を光散乱板を介して液晶表示素子の裏面から照射し、
液晶素子の表示面に各種画像を表示している。図１は光
源が光散乱板の左右にある例であり、図２に示す例は、
光源が光散乱板の後方にある場合である。2. Description of the Related Art Conventionally, a backlight type liquid crystal display device irradiates light from a light source (not shown) from the back surface of the liquid crystal display device through a light scattering plate, as shown in FIGS.
Various images are displayed on the display surface of the liquid crystal element. FIG. 1 shows an example in which the light sources are on the left and right of the light scattering plate, and the example shown in FIG.
This is the case when the light source is behind the light scattering plate.
【０００３】上記従来の光散乱板は、例えば、アクリル
樹脂などの透明樹脂にシリカなどの無色の微粒子や、有
機のプラスチックピグメントを分散させて光を均一に散
乱させる方法、当面樹脂板の表面を微小凹凸形状にエン
ボス処理する方法、さらにはシリカなどを含む艶消し塗
料を塗布する方法で作成されている。The conventional light scattering plate is, for example, a method in which colorless fine particles such as silica or an organic plastic pigment are dispersed in a transparent resin such as an acrylic resin to uniformly scatter light. It is produced by a method of embossing into a fine irregular shape, and further, a method of applying a matting paint containing silica or the like.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、上記従
来方法の何れにおいても、ある程度の光散乱は可能であ
るものの、シリカなどが光不透過性であることから、光
源光の一部がシリカなどに吸収され、光源光の強度が低
下するという問題があり、また、光の散乱が不充分であ
り、液晶表示素子の背面を均一に照射することができ
ず、表示画面に明暗が生じるという問題がある。従っ
て、本発明の目的は、光源光の減衰がなく、且つ光散乱
性に優れた光散乱板を提供することである。However, in any of the above-mentioned conventional methods, although light scattering is possible to some extent, since silica or the like is light-impermeable, a part of the light source light is converted to silica or the like. There is a problem that light is absorbed and the intensity of light from the light source is reduced.In addition, light is not sufficiently scattered, and the back surface of the liquid crystal display element cannot be uniformly illuminated. is there. Accordingly, an object of the present invention is to provide a light scattering plate which does not attenuate light from a light source and has excellent light scattering properties.
【０００５】[0005]
【課題を解決するための手段】上記目的は、以下の本発
明によって達成される。すなわち、本発明は、透明樹脂
からなる板状体内に、５〜３０重量％の無色の中空ガラ
ス微小球体が均一に分散していることを特徴とする光散
乱板を提供する。The above object is achieved by the present invention described below. That is, the present invention provides a light scattering plate characterized in that 5 to 30% by weight of colorless hollow glass microspheres are uniformly dispersed in a plate made of a transparent resin.
【０００６】[0006]
【発明の実施の形態】次に好ましい実施の形態を挙げて
本発明をさらに詳細に説明する。本発明において使用す
る透明樹脂板は特に限定されないが、透光性に優れたア
クリル樹脂、ポリカーボネート又はポリスチレンからな
る透明板が好ましい。本発明では、上記透明樹脂板に、
その樹脂板の５〜３０重量％の無色の中空ガラス微小球
体が均一に分散する。Next, the present invention will be described in more detail with reference to preferred embodiments. The transparent resin plate used in the present invention is not particularly limited, but a transparent plate made of an acrylic resin, polycarbonate or polystyrene excellent in light transmittance is preferable. In the present invention, the transparent resin plate
Colorless hollow glass microspheres of 5 to 30% by weight of the resin plate are uniformly dispersed.
【０００７】上記無色の中空ガラス微小球体の材質は、
ソジウムボロシリケイトガラスであり、真密度が３．０
〜３．２ｇ／ｃｃであり、さらに好ましくは重量平均粒
子径６０〜９０μｍ、重量平均壁厚１〜３μｍ、軟化温
度４５０〜５００℃、吸油量３０〜５０ｇ／１００ｃｃ
の中空微小球体である。このような中空ガラス微小球体
は、例えば、エコスフェアＩＧ−１０１の商品名で、例
えば、日本エイフルスティック株式会社から入手して使
用できる。The material of the colorless hollow glass microspheres is as follows:
Sodium borosilicate glass with a true density of 3.0
To 3.2 g / cc, more preferably a weight average particle diameter of 60 to 90 μm, a weight average wall thickness of 1 to 3 μm, a softening temperature of 450 to 500 ° C., and an oil absorption of 30 to 50 g / 100 cc.
Is a hollow microsphere. Such a hollow glass microsphere can be used, for example, under the trade name of Ecosphere IG-101 from, for example, Japan Aful Stick.
【０００８】上記中空ガラス微小球体の透明樹脂に対す
る添加量は、該樹脂の５〜３０重量％であることが好ま
しい。添加量が５重量％未満であると望ましい光散乱効
果が得られず、一方、添加量が３０重量％を超えると、
透明樹脂板の成形が困難になる。より好ましくは１０〜
２０重量％である。The amount of the hollow glass microspheres added to the transparent resin is preferably 5 to 30% by weight of the resin. If the amount is less than 5% by weight, the desired light scattering effect cannot be obtained, while if the amount exceeds 30% by weight,
It becomes difficult to form a transparent resin plate. More preferably, 10
20% by weight.
【０００９】本発明の光散乱板は、透明樹脂がアクリル
樹脂である場合には、アクリルシロップ中に所定量の微
小球体を均一に分散させ、キャスティングすることによ
って得られる、この際、ガラス微小球体の分散性を良好
にするために、ガラス微小球体をシランカップリング剤
によって表面処理しておくことが好ましい。When the transparent resin is an acrylic resin, the light-scattering plate of the present invention is obtained by uniformly dispersing a predetermined amount of microspheres in acrylic syrup and casting. In order to improve the dispersibility of the glass microspheres, it is preferable that the glass microspheres are surface-treated with a silane coupling agent.
【００１０】また、透明樹脂が、ポリスチレン、ポリエ
ステル、ポリカーボネートなどである場合には、これら
の樹脂のペレットに所定量の微小球体を配合し、射出成
形や押出成形によって所定形状に成形することによって
得られる。このようにして得られる光散乱板の形状は、
該光散乱板を用いる液晶ディスプレイの液晶素子と略同
一形状であり、その厚みは０．５〜５．０ｍｍ程度であ
る。When the transparent resin is polystyrene, polyester, polycarbonate, or the like, a predetermined amount of microspheres is blended into pellets of these resins, and the mixture is formed into a predetermined shape by injection molding or extrusion molding. Can be The shape of the light scattering plate obtained in this way is
It has substantially the same shape as a liquid crystal element of a liquid crystal display using the light scattering plate, and has a thickness of about 0.5 to 5.0 mm.
【００１１】[0011]
【実施例】次に実施例及び比較例を挙げて本発明をさら
に具体的に説明する。 実施例１ メチルメタクリレートに重合開始剤を加えて重合させ、
粘稠な状態のアクリルシロップを得る。該アクリルシロ
ップ１００重量部当たり、日本エイフルスティック株式
会社から「エコスフェア」の商品名で入手した中空ガラ
ス微小球体（ソジウムボロシリケイトガラス、真密度
０．３１１ｇ／ｃｃ、重量平均粒径８０μｍ、重量平均
壁厚２μｍ、吸油量４０ｇ／１００ｃｃ）２０重量部を
均一に分散させ、縦横深さ３０ｃｍ×３０ｃｍ×２ｍｍ
の型に注入し、５０〜５５℃の温度で１０時間保持して
重合を完了させ、本発明の光散乱板（Ａ）を得た。Next, the present invention will be described more specifically with reference to examples and comparative examples. Example 1 A polymerization initiator was added to methyl methacrylate and polymerized.
A viscous acrylic syrup is obtained. Per 100 parts by weight of the acrylic syrup, hollow glass microspheres (sodium borosilicate glass, true density 0.311 g / cc, weight average particle diameter 80 μm, weight An average wall thickness of 2 μm and an oil absorption of 40 g / 100 cc) 20 parts by weight are uniformly dispersed, and a depth of 30 cm × 30 cm × 2 mm
And kept at a temperature of 50 to 55 ° C. for 10 hours to complete the polymerization to obtain a light scattering plate (A) of the present invention.
【００１２】実施例２〜３ ポリスチレンペレット１００重量部に実施例１と同じガ
ラス微小球体をタンブラーで混合し、押出成形機にて縦
横厚さ５ｃｍ×５ｃｍ×３ｍｍの本発明の光散乱板
（Ｂ）を得た。上記ポリスチレンペレットに代えてポリ
カーボネートのペレットを用い上記と同様にして本発明
の光散乱板（Ｃ）を得た。Examples 2 to 3 The same glass microspheres as in Example 1 were mixed with 100 parts by weight of polystyrene pellets using a tumbler, and the light-scattering plate (B) of the present invention having a length and width of 5 cm × 5 cm × 3 mm was used by an extruder. ) Got. A light-scattering plate (C) of the present invention was obtained in the same manner as described above except that polycarbonate pellets were used instead of the polystyrene pellets.
【００１３】比較例１〜３ 実施例１〜３におけるガラス微小球体に代えて、シリカ
微粒子を同量用い、他は実施例１〜３と同様にしてそれ
ぞれ比較例の光散乱板（Ａ’、Ｂ’及びＣ’）を得た。Comparative Examples 1 to 3 In place of the glass microspheres in Examples 1 to 3, the same amount of silica fine particles was used, and the other light scattering plates (A ', B ′ and C ′) were obtained.
【００１４】上記実施例及び比較例の光散乱板につい
て、そのサイズをそれぞれ５ｃｍ×５ｃｍに調整し、内
部に１０Ｗの電球を有し、一方が開いている箱に、上記
光散乱板を被せ、光が漏れないようにシールした後、電
球を点灯して光散乱板の表面の明暗及び輝度を調べたと
ころ下記の結果が得られた。尚、光散乱板と光源との距
離は１０ｃｍとした。対比は、明暗については肉眼判定
し、輝度については本発明の光散乱板の輝度を１００と
して相対比較した。Each of the light scattering plates of the above Examples and Comparative Examples was adjusted to a size of 5 cm × 5 cm, a 10 W light bulb was placed inside, and the light scattering plate was placed on a box that was open on one side. After sealing to prevent light from leaking, the light bulb was turned on to examine the brightness and brightness of the surface of the light scattering plate, and the following results were obtained. The distance between the light scattering plate and the light source was 10 cm. The contrast was determined by the naked eye with respect to light and dark, and the luminance was relatively compared with the luminance of the light scattering plate of the present invention as 100.
【００１５】 [0015]
【００１６】[0016]
【発明の効果】本発明によれば、光源光の減衰がなく、
且つ光散乱性に優れた光散乱板を提供することができ
る。According to the present invention, there is no attenuation of the light source light,
In addition, a light scattering plate having excellent light scattering properties can be provided.
【図１】 本発明の光散乱板を説明する図。FIG. 1 is a diagram illustrating a light scattering plate of the present invention.
【図２】 本発明の光散乱板を説明する図。FIG. 2 is a diagram illustrating a light scattering plate of the present invention.
Claims (5)
重量％の無色の中空ガラス微小球体が均一に分散してい
ることを特徴とする光散乱板。1. A plate-like body made of a transparent resin has a thickness of 5 to 30.
A light-scattering plate characterized in that weight-% colorless hollow glass microspheres are uniformly dispersed.
ネート又はポリスチレンからなる請求項１に記載の光散
乱板。2. The light-scattering plate according to claim 1, wherein the transparent resin plate is made of an acrylic resin, polycarbonate or polystyrene.
ボロシリケイトガラスであり、真密度が３．０〜３．２
ｇ／ｃｃである請求項１に記載の光散乱板。3. The colorless hollow glass microspheres are sodium borosilicate glass having a true density of 3.0 to 3.2.
The light-scattering plate according to claim 1, wherein the light-scattering plate is g / cc.
粒子径６０〜９０μｍ、重量平均壁厚１〜３μｍ、軟化
温度４５０〜５００℃、吸油量３０〜５０ｇ／１００ｃ
ｃの中空微小球体である請求項１に記載の光散乱板。4. A colorless hollow glass microsphere having a weight average particle diameter of 60 to 90 μm, a weight average wall thickness of 1 to 3 μm, a softening temperature of 450 to 500 ° C., and an oil absorption of 30 to 50 g / 100 c.
The light-scattering plate according to claim 1, which is a hollow microsphere of c.
に記載の光散乱板。5. A light scattering plate for a liquid crystal display device.
The light-scattering plate according to 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001016715A JP2002221607A (en) | 2001-01-25 | 2001-01-25 | Light scattering plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001016715A JP2002221607A (en) | 2001-01-25 | 2001-01-25 | Light scattering plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2002221607A true JP2002221607A (en) | 2002-08-09 |
Family
ID=18883030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001016715A Pending JP2002221607A (en) | 2001-01-25 | 2001-01-25 | Light scattering plate |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2002221607A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005043955A1 (en) * | 2005-07-06 | 2007-01-11 | Preh Gmbh | solar sensor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08248232A (en) * | 1995-03-07 | 1996-09-27 | Dainippon Printing Co Ltd | Surface light emitting device and its production |
-
2001
- 2001-01-25 JP JP2001016715A patent/JP2002221607A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08248232A (en) * | 1995-03-07 | 1996-09-27 | Dainippon Printing Co Ltd | Surface light emitting device and its production |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102005043955A1 (en) * | 2005-07-06 | 2007-01-11 | Preh Gmbh | solar sensor |
| DE102005043955B4 (en) * | 2005-07-06 | 2007-05-03 | Preh Gmbh | solar sensor |
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