JPH1164644A - Plane illuminant - Google Patents
Plane illuminantInfo
- Publication number
- JPH1164644A JPH1164644A JP9231835A JP23183597A JPH1164644A JP H1164644 A JPH1164644 A JP H1164644A JP 9231835 A JP9231835 A JP 9231835A JP 23183597 A JP23183597 A JP 23183597A JP H1164644 A JPH1164644 A JP H1164644A
- Authority
- JP
- Japan
- Prior art keywords
- light
- range
- diffusing plate
- emitting surface
- plate
- 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
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶表示体用のバ
ックライトや発光表示体、発光式看板、交通用発光標識
などに光源として用いられるエッジライト式平面発光体
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an edge-light type flat illuminant used as a light source for a backlight or a luminous display for a liquid crystal display, a luminous sign, a luminous sign for traffic, and the like.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】平面発
光体としては、従来、光拡散板の下部に蛍光管を置き、
更にその蛍光管の下に反射板あるいは反射シートを配し
た、いわゆる直下型平面発光体（直下型バックライト）
がある。しかし、直下型平面発光体は輝度は比較的明る
いものの均一性に難点があり、しかも厚みが厚く、最近
の傾向である薄型、コンパクトの点で満足が得られてい
ない。2. Description of the Related Art Conventionally, as a plane light emitter, a fluorescent tube has been conventionally placed under a light diffusion plate.
Further, a so-called direct-type flat light-emitting body (direct-type backlight) in which a reflecting plate or a reflecting sheet is disposed below the fluorescent tube.
There is. However, the direct-type flat illuminant has relatively high brightness but has difficulty in uniformity, and has a large thickness and is not satisfactory in recent years in terms of thinness and compactness.
【０００３】これに対し、最近では、導光板の周辺部に
蛍光管を配したエッジライト式平面発光体（エッジライ
ト型バックライト）が提案されている。このエッジライ
ト式平面発光体は、例えば図１に示すような構成を有す
る。On the other hand, recently, an edge-light type flat light-emitting body (edge-light type backlight) in which a fluorescent tube is arranged around a light guide plate has been proposed. This edge-light type planar light-emitting body has, for example, a configuration as shown in FIG.
【０００４】即ち、１は導光板で、その表面（発光面）
上に光拡散シート２及びプリズムシート３を積層、配設
すると共に、裏面に反射シート４を積層、配設し、かつ
上記導光板１の少なくとも一側方に蛍光ランプ（光源）
５を配置した構成を有する。なお、６はランプリフレク
ターであり、これらの部品をフレーム７に収納する。That is, 1 is a light guide plate whose surface (light emitting surface)
A light diffusing sheet 2 and a prism sheet 3 are laminated and disposed on the upper surface, and a reflection sheet 4 is laminated and disposed on the back surface, and a fluorescent lamp (light source) is disposed on at least one side of the light guide plate 1.
5 is arranged. Reference numeral 6 denotes a lamp reflector, which stores these components in a frame 7.
【０００５】しかし、このエッジライト式平面発光体は
いわゆる液晶表示板などで言われる低消費電力、薄型、
コンパクトなどの要求に対してある程度満足するもの
の、発光面の輝度分布の均一性に劣る。この場合、発光
面の輝度分布を均一にするために、ドット印刷や印刷の
代わりに射出成形時に半球型や円錘型のドットパターン
や薄型のパターンを付与するドット成形方式が採用され
てはいるが、いずれも発光面側に拡散シートを置いてパ
ターンをぼかしてはいるものの、完全ではなく、微妙な
輝度ムラを生じている。また、サイズの変更の度にドッ
トのパターンを決定するために、数度は印刷用の版や金
型をテストする必要があり、工数やコストがかかってい
る。[0005] However, this edge-light type flat illuminant has a low power consumption, a low profile, and a so-called liquid crystal display panel.
Although it satisfies the requirement of compactness to some extent, it is inferior in uniformity of luminance distribution on the light emitting surface. In this case, in order to make the luminance distribution of the light emitting surface uniform, a dot forming method of giving a hemispherical or conical dot pattern or a thin pattern at the time of injection molding instead of dot printing or printing has been adopted. However, in both cases, the pattern is blurred by placing a diffusion sheet on the light emitting surface side, but is not perfect and causes slight luminance unevenness. Further, in order to determine the dot pattern every time the size is changed, it is necessary to test a printing plate or a mold several times, which requires man-hours and costs.
【０００６】そこで、それらを解決する手段として、透
明樹脂に透明材料からなる粒子を配合してなる光拡散板
を光導光板として用いたエッジライト式平面発光体が提
案されている。本方式は、粒子の配合量や大きさと導光
板の形状で発光面の均一性を制御するので、発光面にム
ラがなく、低コストで開発が可能であるというメリット
を有している。しかし、出射光の出射角度が低角度であ
るため、正面方向の輝度を満足するためには光の角度を
調節可能なプリズムシートを２枚使用するか、特殊なプ
リズムシートを使用する必要があり、コストの点で問題
があった。[0006] To solve these problems, there has been proposed an edge-light type planar illuminator using a light diffusing plate formed by mixing particles of a transparent material with a transparent resin as a light guide plate. This method has the advantage that the uniformity of the light emitting surface is controlled by the compounding amount and size of the particles and the shape of the light guide plate, so that the light emitting surface has no unevenness and can be developed at low cost. However, since the emission angle of the emitted light is low, it is necessary to use two prism sheets capable of adjusting the light angle or use a special prism sheet in order to satisfy the luminance in the front direction. There was a problem in terms of cost.
【０００７】本発明は上記事情に鑑みなされたもので、
発光面の輝度分布の均一性に優れ、かつ正面輝度が高
く、しかも構成が簡単で安価に製作し得るエッジライト
式平面発光体を提供することを目的とする。[0007] The present invention has been made in view of the above circumstances,
An object of the present invention is to provide an edge-light type planar light-emitting body which is excellent in uniformity of luminance distribution on a light-emitting surface, has high front luminance, is simple in construction, and can be manufactured at low cost.
【０００８】[0008]
【課題を解決するための手段】本発明は、上記目的を達
成するため、 請求項１：透明樹脂に透明材料からなる粒子を配合して
なる光拡散板と、その少なくとも一側方に配置した光源
とを備え、上記光拡散板の少なくとも一側面から上記光
源により入射した光を発光面から出射させるようにした
エッジライト式平面発光体において、上記光拡散板の発
光面に、多数のＶ字状溝を並列形成したことを特徴とす
る平面発光体、 請求項２：Ｖ字状溝をその長さ方向が光拡散板の光入射
面に対し６０°〜１２０°の角度となるように形成した
請求項１記載の平面発光体、 請求項３：Ｖ字状溝の頂角が４５°〜１３５°である請
求項１又は２記載の平面発光体、 請求項４：透明材料からなる粒子の平均粒子径が０．１
〜５０μｍである請求項１，２又は３記載の平面発光体
を提供する。According to the present invention, there is provided a light diffusing plate comprising a transparent resin and particles made of a transparent material, and a light diffusing plate disposed on at least one side thereof. A light source, wherein the light incident from the light source from at least one side surface of the light diffusing plate is emitted from the light emitting surface. A planar light-emitting body, wherein the V-shaped grooves are formed so that the length direction thereof is at an angle of 60 ° to 120 ° with respect to the light incident surface of the light diffusion plate. 3. The planar light emitting device according to claim 1, wherein the apex angle of the V-shaped groove is 45 ° to 135 °, and 4. the particles made of a transparent material. Average particle size is 0.1
The flat light-emitting body according to claim 1, 2 or 3, which has a thickness of about 50 µm.
【０００９】即ち、本発明者等は上記目的を達成するた
め鋭意研究した結果、透明樹脂に透明材料からなる粒子
を配合してなる光拡散板と、その光拡散板の少なくとも
１辺から蛍光管により光を入射するエッジライト式平面
発光体において、その発光面に、連続した均一なＶ字型
の溝を配することで、正面輝度を上げ、プリズムシート
１枚でも十分に要求輝度を達成し、かつ輝度ムラを生じ
ない平面発光体を完成したものである。That is, the present inventors have conducted intensive studies to achieve the above object, and as a result, have found that a light diffusing plate comprising a transparent resin and particles made of a transparent material is mixed, and a fluorescent tube is formed from at least one side of the light diffusing plate. In the edge-light type planar light-emitting body that receives light, the front luminance is increased by arranging continuous and uniform V-shaped grooves on the light-emitting surface, and the required luminance can be sufficiently achieved even with one prism sheet. In addition, a flat light-emitting body that does not cause luminance unevenness is completed.
【００１０】[0010]
【発明の実施の形態及び実施例】本発明にかかる平面発
光体は、図２に示すように、透明樹脂に透明材料からな
る粒子を配合してなる光拡散板１１の少なくとも一側方
に蛍光ランプ等の光源１５を配設してなるものである。BEST MODE FOR CARRYING OUT THE INVENTION As shown in FIG. 2, a planar light-emitting body according to the present invention has a fluorescent material on at least one side of a light diffusing plate 11 made of a transparent resin and particles made of a transparent material. A light source 15 such as a lamp is provided.
【００１１】本発明を実施するにあたり用いる透明材料
からなる粒子とは、ガラス、酸化珪素等の無機材料から
なる粒子や、フッ素樹脂、ポリスチレン樹脂、アクリル
樹脂、ポリカーボネート樹脂、シリコーン樹脂、ポリエ
チレン樹脂、エチレン酢酸ビニル樹脂等の有機材料から
なる粒子などを単独であるいは混合して用いることがで
きる。The particles made of a transparent material used in carrying out the present invention include particles made of an inorganic material such as glass and silicon oxide, fluorine resin, polystyrene resin, acrylic resin, polycarbonate resin, silicone resin, polyethylene resin, and ethylene resin. Particles made of an organic material such as a vinyl acetate resin can be used alone or in combination.
【００１２】また、その粒子の形状は球形である必要は
なく、特に形状に制限はないが、その平均粒子径は０．
１〜５０μｍ、更に好ましくは５〜２０μｍである。平
均粒子径がこの範囲外であると光拡散性能が低下する。The shape of the particles need not be spherical, and there is no particular limitation on the shape.
It is 1 to 50 μm, more preferably 5 to 20 μm. If the average particle size is outside this range, the light diffusion performance will decrease.
【００１３】これらの粒子を分散して光拡散板とする透
明樹脂としては、ポリスチレン樹脂、塩化ビニル樹脂、
ポリカーボネート樹脂、ポリエチレンテレフタレート樹
脂、アクリル樹脂など、光学的に透明な樹脂であれば特
に制約なく用いることができる。As the transparent resin in which these particles are dispersed to form a light diffusion plate, polystyrene resin, vinyl chloride resin,
Any optically transparent resin such as a polycarbonate resin, a polyethylene terephthalate resin, and an acrylic resin can be used without any particular limitation.
【００１４】本発明においては、上記光拡散板１１の発
光面１２に、多数の連続Ｖ字状溝１４を互いに所定間隔
ピッチで並列形成する。この場合、これら溝１４は、そ
の長さ方向が光拡散板１１の光入射面１３（蛍光ランプ
等の光源１５が配置された側面）に対して６０°〜１２
０°、より好ましくは７０°〜１１０°、最も好ましく
は８０°〜１００°の角度をなすように（つまり、光入
射面１３に対してほぼ直角方向に沿って）形成すること
が推奨される。このように９０°近くに溝を形成した場
合は、光拡散板の導光作用が妨げられず、均一発光かつ
高輝度化することが可能であるが、例えば６０°未満、
１２０°を超えるように形成した場合は、導光作用が失
われ、不均一な発光となる（ランプ近傍のみが明るく、
溝部が暗くなる）。In the present invention, a large number of continuous V-shaped grooves 14 are formed in parallel on the light emitting surface 12 of the light diffusion plate 11 at a predetermined pitch. In this case, the length direction of these grooves 14 is set to 60 ° to 12
It is recommended to form an angle of 0 °, more preferably 70 ° to 110 °, and most preferably 80 ° to 100 ° (that is, along a direction substantially perpendicular to the light incident surface 13). . When the groove is formed near 90 ° in this manner, the light guiding action of the light diffusion plate is not hindered, and uniform light emission and high luminance can be achieved.
When formed so as to exceed 120 °, the light guiding action is lost, resulting in non-uniform light emission.
The groove becomes darker).
【００１５】また、上記Ｖ字状溝のサイズは特に制限さ
れないが、頂角αは４５°〜１３５°がよく、好ましく
は７０°〜１１０°、更に好ましくは８０°〜１００°
がよい。Ｖ字状溝のピッチｄは、加工の精度やバックラ
イトとしての品位を考えると１０〜２００μｍが適当で
あるが、好ましくは２０〜１００μｍ、更に好ましくは
３０〜７０μｍがよい（図３参照）。The size of the V-shaped groove is not particularly limited, but the apex angle α is preferably 45 ° to 135 °, preferably 70 ° to 110 °, more preferably 80 ° to 100 °.
Is good. The pitch d of the V-shaped groove is suitably from 10 to 200 μm in consideration of processing accuracy and quality as a backlight, but is preferably from 20 to 100 μm, and more preferably from 30 to 70 μm (see FIG. 3).
【００１６】本発明によれば、上記のように多数のＶ字
状溝を形成したことにより、図４に示したように、光拡
散板内の散乱光Ｌが出射するときにＶ字状溝１４面で屈
折することで、光が正面方向に向き、正面輝度が高くな
るものである。According to the present invention, by forming a large number of V-shaped grooves as described above, as shown in FIG. 4, when the scattered light L in the light diffusion plate is emitted, the V-shaped grooves are formed. The light is directed in the front direction by refraction on the 14 surfaces, and the front luminance is increased.
【００１７】本発明の平面発光体のその他の構成は公知
の構成とすることができ、例えば、図１に示す構成とす
ることができる。即ち、一般的なエッジライト式平面発
光体と同様に裏面に反射フィルム、蛍光灯のない周辺に
は反射テープ、蛍光管の裏面にはリフレクターを配し、
発光面には連続する均一なＶ字状溝のパターンや出射光
の分布を均一化するための第１の拡散シート、光を正面
方向に集光するプリズムシート、更に全体的に光を拡散
し微小な欠点などをカバーすると共に、やはり正面輝度
を向上させる第２の拡散シート、全体を固定するフレー
ムなどの部品を備えることができる。ここで重要なの
は、従来正面輝度向上の目的でプリズムシートが２枚用
いられてきたのが、本発明によれば１枚で同等以上の正
面輝度を得ることができる。The other configuration of the flat light-emitting body of the present invention can be a known configuration, for example, the configuration shown in FIG. That is, like the general edge light type flat illuminator, a reflective film on the back surface, a reflective tape on the periphery without a fluorescent lamp, a reflector on the back surface of the fluorescent tube,
On the light emitting surface, a continuous uniform V-shaped groove pattern and a first diffusion sheet for equalizing the distribution of emitted light, a prism sheet for condensing light in the front direction, and further diffusing light as a whole. Components such as a second diffusion sheet that covers small defects and the like and also improves front luminance and a frame that fixes the whole can be provided. What is important here is that two prism sheets have conventionally been used for the purpose of improving the front luminance, but according to the present invention, one or more sheets can achieve the same or higher front luminance.
【００１８】なお、拡散板の裏面あるいは周辺部に貼る
光反射シート、反射テープ（反射材料）は、ポリエチレ
ンテレフタレートやポリカーボネートフィルムなどの透
明フィルムに金属をコーティングした光反射フィルムや
チタン白、炭カル、亜鉛華、白艶華ＣＣ等の白色顔料を
添加した光反射用白フィルム、ポリエチレンテレフタレ
ートやポリカーボネートなどの透明材料を発泡させてフ
ィルム化した白色フィルム等を用いることができる。The light reflection sheet and the reflection tape (reflection material) to be adhered to the back surface or the peripheral portion of the diffusion plate are a light reflection film in which a metal is coated on a transparent film such as polyethylene terephthalate or polycarbonate film, titanium white, carbon charcoal, or the like. A white film for light reflection to which a white pigment such as zinc white and white gloss white CC is added, a white film formed by foaming a transparent material such as polyethylene terephthalate or polycarbonate and the like can be used.
【００１９】〔実験例〕アクリル樹脂（屈折率１．４
９）１００重量部にシリコーン樹脂微粒子（屈折率１．
４３、平均粒子径１２μｍ）を０．３重量部配合、分散
し、射出成形により５５ｍｍ×４４ｍｍ×３ｍｍのサイ
ズの光散乱板を作製し、その表面（発光面）に頂角９０
°、ピッチ５０μｍで多数のＶ字状溝を並列、形成し
た。この場合、これら溝は光散乱板の一側面に対し直角
方向に沿って形成した。そして、この一側面の側方に蛍
光ランプを配設し、光散乱板の裏面に反射シート、表面
（発光面）に拡散シートを積層したところ、均一で正面
輝度の高い発光が得られた。Experimental Example Acrylic resin (refractive index 1.4)
9) 100 parts by weight of silicone resin fine particles (refractive index: 1.
43, an average particle diameter of 12 μm) were mixed and dispersed, and a light-scattering plate having a size of 55 mm × 44 mm × 3 mm was prepared by injection molding.
°, a large number of V-shaped grooves were formed in parallel at a pitch of 50 μm. In this case, these grooves were formed along a direction perpendicular to one side surface of the light scattering plate. Then, a fluorescent lamp was disposed on one side of the side surface, and a reflection sheet was laminated on the back surface of the light scattering plate, and a diffusion sheet was laminated on the front surface (light emitting surface). As a result, uniform light emission with high front luminance was obtained.
【００２０】[0020]
【発明の効果】本発明のエッジライト式平面発光体は、
発光面の輝度分布が均一である上、正面輝度が高いもの
である。According to the present invention, there is provided an edge-light type flat illuminator,
The luminance distribution on the light emitting surface is uniform and the front luminance is high.
【図１】エッジライト式平面発光体の一例を示す展開斜
視図である。FIG. 1 is an exploded perspective view showing an example of an edge-light type planar light-emitting body.
【図２】本発明の平面発光体の光散乱板の一実施例を示
す斜視図である。FIG. 2 is a perspective view showing one embodiment of the light-scattering plate of the planar light-emitting body of the present invention.
【図３】Ｖ字状溝の説明図である。FIG. 3 is an explanatory view of a V-shaped groove.
【図４】Ｖ字状溝に対する散乱光の反射態様を示す説明
図である。FIG. 4 is an explanatory view showing a reflection mode of scattered light on a V-shaped groove.
１ 導光板 ２ 光拡散シート ３ プリズムシート ４ 反射シート ５ 光源 ６ ランプリフレクター ７ フレーム １１ 光拡散板 １２ 発光面 １３ 光入射面 １４ 連続Ｖ字状溝 １５ 光源 Ｌ 散乱光 α 頂角 ｄ ピッチ Reference Signs List 1 light guide plate 2 light diffusion sheet 3 prism sheet 4 reflection sheet 5 light source 6 lamp reflector 7 frame 11 light diffusion plate 12 light emitting surface 13 light incident surface 14 continuous V-shaped groove 15 light source L scattered light α apex angle d pitch
Claims (4)
してなる光拡散板と、その少なくとも一側方に配置した
光源とを備え、上記光拡散板の少なくとも一側面から上
記光源により入射した光を発光面から出射させるように
したエッジライト式平面発光体において、上記光拡散板
の発光面に、多数のＶ字状溝を並列形成したことを特徴
とする平面発光体。1. A light diffusing plate comprising particles of a transparent material mixed in a transparent resin, and a light source disposed on at least one side of the light diffusing plate, and light is incident on the light diffusing plate from at least one side surface of the light diffusing plate. An edge-light type planar light-emitting device that emits light from a light-emitting surface, wherein a number of V-shaped grooves are formed in parallel on the light-emitting surface of the light diffusion plate.
入射面に対し６０°〜１２０°の角度となるように形成
した請求項１記載の平面発光体。2. The flat light emitting device according to claim 1, wherein the V-shaped groove is formed so that its length direction is at an angle of 60 ° to 120 ° with respect to the light incident surface of the light diffusion plate.
る請求項１又は２記載の平面発光体。3. The flat light emitting device according to claim 1, wherein the V-shaped groove has an apex angle of 45 ° to 135 °.
０．１〜５０μｍである請求項１，２又は３記載の平面
発光体。4. The flat light-emitting device according to claim 1, wherein the particles made of a transparent material have an average particle size of 0.1 to 50 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9231835A JPH1164644A (en) | 1997-08-13 | 1997-08-13 | Plane illuminant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9231835A JPH1164644A (en) | 1997-08-13 | 1997-08-13 | Plane illuminant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1164644A true JPH1164644A (en) | 1999-03-05 |
Family
ID=16929767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9231835A Pending JPH1164644A (en) | 1997-08-13 | 1997-08-13 | Plane illuminant |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1164644A (en) |
-
1997
- 1997-08-13 JP JP9231835A patent/JPH1164644A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4729067A (en) | Light diffusing device | |
| US7165874B2 (en) | Backlight unit and liquid crystal display device | |
| US7553058B2 (en) | Optical plate and method for manufacturing same and backlight module using same | |
| US6502947B2 (en) | Planar light source device and liquid crystal display apparatus | |
| WO1997028403A1 (en) | Surface light source element and liquid crystal display device, sign device and traffic control sign device using same | |
| TW200537201A (en) | Optical material, optical element, illuminator and display device | |
| US20090303414A1 (en) | Optical member with a scatter layer, and backlight assembly and display device having the same | |
| JP2001202814A (en) | Down light type of flat luminous body | |
| JP2000056107A (en) | Prism sheet and surface light source element | |
| JP2001176315A (en) | Surface type luminescence and desktop lighting system using the same | |
| JPH0627325A (en) | Surface light source device | |
| JP2000113708A (en) | Lighting system | |
| JP3064006B2 (en) | Surface emitting device | |
| JPH1164645A (en) | Plane illuminant | |
| KR20010046581A (en) | Backlight device for display | |
| JPH035726A (en) | Backlighting device | |
| JP2002216530A (en) | Surface light source device, light guide for surface light source device and method for manufacturing the same | |
| JP3929599B2 (en) | Prism sheet and surface light source element | |
| JP2001133605A (en) | Lens sheet, backlight utilizing the same and liquid crystal display device | |
| JPH1164643A (en) | Plane illuminant | |
| JPH1164644A (en) | Plane illuminant | |
| JP4684791B2 (en) | LIGHTING DEVICE, LIGHT CONTROL MEMBER USED FOR THE SAME, AND IMAGE DISPLAY DEVICE USING THEM | |
| JPH09160024A (en) | Back light and liquid crystal display device using the back light | |
| JPH1031113A (en) | Light transmission body for surface light source element and surface light source element | |
| JP3682124B2 (en) | Surface light source element |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20040823 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20040901 |
|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 20050406 |