JPH04199001A - Light guide plate for planar light source - Google Patents
Light guide plate for planar light sourceInfo
- Publication number
- JPH04199001A JPH04199001A JP2331271A JP33127190A JPH04199001A JP H04199001 A JPH04199001 A JP H04199001A JP 2331271 A JP2331271 A JP 2331271A JP 33127190 A JP33127190 A JP 33127190A JP H04199001 A JPH04199001 A JP H04199001A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light source
- pattern
- diffusion layer
- 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
- 238000009792 diffusion process Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 9
- 238000007639 printing Methods 0.000 claims description 7
- 230000007423 decrease Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 abstract 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 11
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000007650 screen-printing Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 2
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000007645 offset printing Methods 0.000 description 2
- 239000000049 pigment Substances 0.000 description 2
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 2
- 239000012463 white pigment Substances 0.000 description 2
- 239000004606 Fillers/Extenders Substances 0.000 description 1
- WOBHKFSMXKNTIM-UHFFFAOYSA-N Hydroxyethyl methacrylate Chemical compound CC(=C)C(=O)OCCO WOBHKFSMXKNTIM-UHFFFAOYSA-N 0.000 description 1
- 229920000297 Rayon Polymers 0.000 description 1
- HVVWZTWDBSEWIH-UHFFFAOYSA-N [2-(hydroxymethyl)-3-prop-2-enoyloxy-2-(prop-2-enoyloxymethyl)propyl] prop-2-enoate Chemical compound C=CC(=O)OCC(CO)(COC(=O)C=C)COC(=O)C=C HVVWZTWDBSEWIH-UHFFFAOYSA-N 0.000 description 1
- 239000003522 acrylic cement Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- NWVVVBRKAWDGAB-UHFFFAOYSA-N p-methoxyphenol Chemical compound COC1=CC=C(O)C=C1 NWVVVBRKAWDGAB-UHFFFAOYSA-N 0.000 description 1
- -1 polyethylene terephthalate Polymers 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000011787 zinc oxide Substances 0.000 description 1
Landscapes
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、各種表示装置のバックライトとして用いられ
る面状光源装置の導光板に関し、特に輝度を改良したこ
の種の導光板に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a light guide plate for a planar light source device used as a backlight for various display devices, and particularly relates to this type of light guide plate with improved brightness. .
［従来の技術および発明が解決しようとする課題］表示
装置のバックライトとして用いられる面状光源装置とし
ては、直管状光源とその上方に位置する光量調整セル及
び光拡散性アクリル板とから成る直下型の面状光源装置
（特開昭５５−１５１２６号公報）、光源から離れるに
つれて塗布面積が大きくなるように拡散層パターンを形
成させた導光板を用い、この導光板に近接して反射板と
、拡散層パターンの形成面の反対面に拡散板とを設けた
エツジライト方式の面状光源装置（特開平１−２４１５
９０号公報）等が知られている。[Prior Art and Problems to be Solved by the Invention] A planar light source device used as a backlight for a display device includes a straight tube light source, a light amount adjustment cell located above the straight tube light source, and a light diffusing acrylic plate. type planar light source device (Japanese Unexamined Patent Publication No. 55-15126), a light guide plate on which a diffusion layer pattern is formed so that the coating area becomes larger as the distance from the light source increases, and a reflector and a reflector are placed close to the light guide plate. , an edge-light type planar light source device in which a diffusion plate is provided on the opposite surface to the surface on which the diffusion layer pattern is formed (Japanese Patent Laid-Open No. 1-2415
90) etc. are known.
しかし、前者は高い輝度か得られるものの、面状光源装
置としては厚みが厚くなり、装置全体が大型化する、用
途が限定される等の問題点があって。また、後者は厚み
が薄く、所定の拡散層パターンによって光源からの距離
に拘らず明るさの均一化が図れるという利点があるか、
拡散層パターンは白色顔料の塗布によって形成されるた
め微細なパターンの形成が困難である。このため従来、
２０ Ｌ／ｉｎｃｈ〜６０ Ｌ／ｉｎｃｈ程度のパター
ンが形成されていたが、このようなパターンはそのまま
では導光板の光射出面から視認されてしまうため、パタ
ーンを消すための拡散板が更に必要となり、面状光源と
して輝度が低下してしまうという難点があった。However, although the former can provide high brightness, it has problems such as being thick as a planar light source device, increasing the size of the entire device, and limiting its use. Also, the latter has the advantage that it is thin and the brightness can be made uniform regardless of the distance from the light source due to the predetermined diffusion layer pattern.
Since the diffusion layer pattern is formed by coating a white pigment, it is difficult to form a fine pattern. For this reason, conventionally,
A pattern of approximately 20 L/inch to 60 L/inch was formed, but such a pattern would be visible from the light exit surface of the light guide plate if left as it was, so an additional diffuser plate was required to erase the pattern. However, as a planar light source, there was a problem in that the brightness decreased.
［発明の目的コ
本発明はこのような従来の面状光源装置の難点を除去す
るためになされたもので、薄型で輝度の高い面状光源装
置に用いられるのに適した導光板の提供することを目的
とする。[Purpose of the Invention] The present invention has been made in order to eliminate the drawbacks of the conventional planar light source device, and provides a light guide plate suitable for use in a thin and high brightness planar light source device. The purpose is to
［課題を解決するための手段］
このような目的を達成する本発明の面状光源用導光板は
、少なくとも一つの端面を入射面とし、これと直交する
面を光射出面とする透明板と、該透明板の光射出面ある
いは光射出面の反対面に設けられた光拡散層とから成る
導光板において、光拡散層は１００ Ｌ／ｉｎｃｈ 〜
３００ Ｌ／ｉｎｃｈの網点から成る光拡散パターンを
有し且つ該光拡散パターンの面積か透明板を透過する光
の光量が少なくなるに従って大きくなるように形成され
ているものである。[Means for Solving the Problems] The light guide plate for a planar light source of the present invention that achieves the above object includes a transparent plate having at least one end surface as an incident surface and a surface orthogonal to the incident surface as a light exit surface. , and a light diffusing layer provided on the light exit surface of the transparent plate or on the opposite surface of the light exit surface, the light diffusing layer has a diameter of 100 L/inch to
It has a light diffusion pattern consisting of halftone dots of 300 L/inch, and the area of the light diffusion pattern increases as the amount of light transmitted through the transparent plate decreases.
透明板としては、ガラス板、アクリル板等通常導光板と
して用いられる実質的に透明な板が用いられる。このよ
うな透明板は厚さ方向の端面を入射面とし蛍光ランプ等
の直管状光源が取り付けられ、入射面と直交する面が光
射出面となる。As the transparent plate, a substantially transparent plate that is normally used as a light guide plate, such as a glass plate or an acrylic plate, is used. Such a transparent plate has an end surface in the thickness direction as an incident surface, and a straight tube-shaped light source such as a fluorescent lamp is attached thereto, and a surface perpendicular to the incident surface serves as a light exit surface.
光拡散層は、透明板の光射出面或いはその反対側の面に
設けられる。光拡散層は入射光を効率よく拡散、反射す
る材質のもので形成された所定のパターンから成り、こ
のパターンは好適には印刷法或いは感光性組成物を用い
た写真法によって形成する。印刷法の場合、酸化チタン
、酸化亜鉛等の白色顔料或いはシリカ、タルク等の体質
顔料を含む印刷インキをオフセット印刷、シルクスクリ
ーン印刷、グラビア印刷等公知の印刷法によって印刷す
る。写真法の場合は、公知の感光性組成物に前述のよう
な顔料を分散させてフィルム全面に塗布した後、写真法
によってパターン形成させる。The light diffusion layer is provided on the light exit surface of the transparent plate or the opposite surface thereof. The light diffusing layer consists of a predetermined pattern formed of a material that efficiently diffuses and reflects incident light, and this pattern is preferably formed by a printing method or a photographic method using a photosensitive composition. In the case of a printing method, a printing ink containing a white pigment such as titanium oxide or zinc oxide or an extender pigment such as silica or talc is printed by a known printing method such as offset printing, silk screen printing, or gravure printing. In the case of a photographic method, the above-mentioned pigment is dispersed in a known photosensitive composition and applied to the entire surface of the film, and then a pattern is formed by a photographic method.
光拡散層２は、第１図に示すように透明板１に直接形成
させてもよいが、第２図に示すようにポリエチレン、ポ
リ塩化ビニル等から成る可撓性フィルム３に上記印刷法
或いは写真法によって予め光拡散層パターン２゛を形成
したものを粘着剤、接着剤を用いて透明板１にラミネー
トしても良い。The light diffusion layer 2 may be formed directly on the transparent plate 1 as shown in FIG. 1, but as shown in FIG. The light diffusing layer pattern 2' may be formed in advance by a photographic method and then laminated onto the transparent plate 1 using an adhesive or an adhesive.
この場合は、透明板として薄いものを用いた場合でもそ
の破損や反りを生じることかなく製造が容易である。In this case, even if a thin transparent plate is used, it is easy to manufacture without causing damage or warping.
光拡散層のパターンは、第３図に示すようにその面積が
透明板を透過する光の光量か少なくなるに従って大きく
なるようになっていることが好ましく、これにより光源
からの距離に拘らず均一な明るさを確保できる。従って
、光源か導光板の一端に設けられる場合には、光源から
距離が離れるに従って光を反射するパターン面積が大き
くなるようにし、光源が導光板の両端に設けられる場合
には、光源と光源との間の導光板の中央部で光を反射す
るパターン面積が最大となるようにする。As shown in Figure 3, the pattern of the light diffusion layer is preferably such that its area increases as the amount of light transmitted through the transparent plate decreases, so that it is uniform regardless of the distance from the light source. Brightness can be ensured. Therefore, when the light source is provided at one end of the light guide plate, the area of the pattern that reflects light increases as the distance from the light source increases, and when the light source is provided at both ends of the light guide plate, the pattern area that reflects the light increases. The area of the pattern that reflects light is maximized at the center of the light guide plate between the two.
また、パターン形状は網点とし、その線数は１゜ＯＬ／
ｉｎｃｈ 〜３００ Ｌ／ｉｎｃｈとする。網点は、縞
模様等に比べ均一性がよい。線数は１００ Ｌ／ｉｎｃ
ｈより粗すぎる場合にはパターンが視認されるため、パ
ターンを消すための拡散板が必要となり、面状光源とし
て輝度が低下してしまうおそれがある。また、細かすぎ
ると均一なパターンを再現性良く得ることが困難になる
。In addition, the pattern shape is halftone dots, and the number of lines is 1゜OL/
inch to 300 L/inch. Halftone dots have better uniformity than striped patterns. The number of lines is 100 L/inc
If it is rougher than h, the pattern will be visible and a diffuser plate will be required to erase the pattern, which may reduce the brightness as a planar light source. Furthermore, if the thickness is too fine, it becomes difficult to obtain a uniform pattern with good reproducibility.
このように構成される本発明の導光板は、例えば第２図
に示すように、光拡散層２を形成した面１ａに全反射フ
ィルム４を貼付して、厚さ方向の一端面ＩＣに蛍光ラン
プ等の直管状光源５、その他の光源を組合せることによ
り面状光源として、露光装置、ライトテーブル、表示装
置等の面状光源を必要とする各種装置に利用できる。こ
の場合、光源は光が導光板側に出射するように周囲を反
射フィルム６で覆っておくことが好ましい。尚、図では
光拡散層２を形成した面１ａと反対の面１ｂを光射出面
としているか、反対の面１ｂに全反射フィルム４を貼付
して光拡散層２を形成した面１ａを光射出面としてもよ
い。As shown in FIG. 2, for example, the light guide plate of the present invention configured as described above has a total reflection film 4 attached to the surface 1a on which the light diffusion layer 2 is formed, and a fluorescent film is attached to one end surface IC in the thickness direction. By combining the straight tube light source 5 such as a lamp with other light sources, it can be used as a planar light source in various devices requiring a planar light source, such as an exposure device, a light table, and a display device. In this case, the light source is preferably covered with a reflective film 6 so that the light is emitted toward the light guide plate. In addition, in the figure, the surface 1b opposite to the surface 1a on which the light diffusion layer 2 is formed is used as the light emission surface, or the surface 1a on which the light diffusion layer 2 is formed by pasting the total reflection film 4 on the opposite surface 1b is used as the light emission surface. It can also be used as a mask.
［実施例］
実施例１
厚さ３ｍｍの透明アクリル板（商品名スミペックスＥＯ
ＯＩ住友化学（株）製）の片面に、光量が少なくなるに
従って面積が大きくなるような１２０ Ｌ／ｉｎｃｈの
網点グラデーションパターンを、オフセット印刷にて白
色インキで形成させた。[Example] Example 1 A transparent acrylic plate with a thickness of 3 mm (product name: Sumipex EO)
A halftone dot gradation pattern of 120 L/inch, whose area increases as the amount of light decreases, was formed on one side of OI (manufactured by Sumitomo Chemical Co., Ltd.) using white ink by offset printing.
実施例２
実施例１と同様の厚さ３ｍｍの透明アクリル板の片面に
、以下処方の光拡散性感光性組成物を、乾燥塗膜厚さ５
μｍになるように、塗布した。Example 2 A light-diffusing photosensitive composition having the following formulation was applied to one side of a transparent acrylic plate with a thickness of 3 mm as in Example 1 to a dry coating thickness of 5 mm.
It was coated to a thickness of μm.
・メタクリル酸・メタクリル酸メチル・メタクリル酸２
−ヒドロキシエチル共重合体
（メタクリル酸１０モル％、メタクリル酸メチル５０モ
ル％、メタクリル酸２−ヒドロキシエチル４０モル％）
１０ｇ・酸化チタン（商品名タイピュアーＲ
−９００デュポン社製） ２０ｇ
・ペンタエリスリトールトリアクリレートｇ
・２−タロルチオキサントン ０２ｇ・ベンジル
メチルケタール ０６ｇ・ｐ−メトキシフェノ
ール ０．１ｇ・エタノール
６１．１ｇ次にこの光拡散性感光性組成物を塗布し
たアクリル板と１００ Ｌ／ｉｎｃｈの網点よりなるパ
ターンネガ原稿を密着させて紫外線光源プリンターにて
３００ｍ ｊ／ｃ ｒｒｆ露光後、０．５重量％水酸化
ナトリウム溶液にて現像して、感光性組成物の写真法に
よる光拡散層を設けた導光板を作成した。・Methacrylic acid・Methyl methacrylate・Methacrylic acid 2
-Hydroxyethyl copolymer (10 mol% methacrylic acid, 50 mol% methyl methacrylate, 40 mol% 2-hydroxyethyl methacrylate)
10g Titanium oxide (Product name: Tai Pure R)
-900 DuPont) 20g
・Pentaerythritol triacrylate g ・2-thalolthioxanthone 02g ・Benzyl methyl ketal 06g ・p-methoxyphenol 0.1g ・Ethanol
61.1 g Next, the acrylic plate coated with this light-diffusing photosensitive composition was brought into close contact with a patterned negative original consisting of halftone dots of 100 L/inch, and exposed to 300 m j/c rrf using an ultraviolet light source printer. It was developed with a 5% by weight sodium hydroxide solution to produce a light guide plate provided with a light diffusing layer by photographing the photosensitive composition.
実施例３
厚さ５０μｍの透明アクリルフィルム（商品名アクリブ
レンＨＢＳ＃００１ 三菱レイヨン（株）製）の片面
上に、実施例１と同様にＬ ５０ Ｌ／ｉｎｃｈの網点
よりなる光拡散層パターンをオフセット印刷した。Example 3 A light-diffusing layer pattern consisting of halftone dots of L 50 L/inch was formed on one side of a 50 μm thick transparent acrylic film (trade name Acryblane HBS#001, manufactured by Mitsubishi Rayon Co., Ltd.) in the same manner as in Example 1. Offset printed.
次にこの光拡散層パターンを印刷したアクリルフィルム
の印刷面側に、エマルジョン型アクリル系粘着剤（商品
名ＳＫダインＲＥ−２綜研化学（株）製）を乾燥膜厚１
０μｍになるように全面に塗布、乾燥した後、これを実
施例１と同様の透明アクリル板にラミネートして導光板
を作成した。Next, an emulsion type acrylic adhesive (trade name SK Dyne RE-2 manufactured by Soken Kagaku Co., Ltd.) was applied to the printed side of the acrylic film on which this light diffusion layer pattern was printed to a dry film thickness of 1.
After coating the entire surface to a thickness of 0 μm and drying, this was laminated to the same transparent acrylic plate as in Example 1 to create a light guide plate.
実施例４
厚さ１００μｍのポリエチレンテレフタレートフィルム
（商品名ルミラーＴ−６０東しく株）製）上に、実施例
２と同様の光拡散性感光性組成物を実施例２と同様に塗
布、乾燥後、２００ Ｌ／ｉｎｃｈの網点よりなる光拡
散層ネガパターンを原稿として露光、現像して光拡散層
パターンを形成させた。Example 4 A light-diffusing photosensitive composition similar to that in Example 2 was applied onto a 100 μm thick polyethylene terephthalate film (trade name Lumirror T-60 manufactured by Toshiku Co., Ltd.) in the same manner as in Example 2, and after drying. , 200 L/inch halftone dots was exposed and developed as an original to form a light diffusion layer pattern.
次にこの光拡散層パターンを形成したフィルムを、実施
例３と同様にして透明アクリル板にラミネートして導光
板を作成した。Next, the film with the light diffusion layer pattern formed thereon was laminated onto a transparent acrylic plate in the same manner as in Example 3 to create a light guide plate.
比較例１
実施例１と同様の透明アクリル板に、２０Ｌ／ｉｎｃｈ
の網点より成る光拡散層パターンをシルクスクリーン印
刷して導光板を作成した。Comparative Example 1 A transparent acrylic plate similar to Example 1 was coated with 20L/inch
A light guide plate was created by silk screen printing a light diffusion layer pattern consisting of halftone dots.
比較例２
比較例１と同様に透明アクリル板に６０ Ｌ／ｉｎｃｈ
の網点より成る光拡散層パターンをシルクスクリーン印
刷し導光板を作成した。Comparative Example 2 Same as Comparative Example 1, 60 L/inch was applied to a transparent acrylic plate.
A light guide plate was created by silk screen printing a light diffusion layer pattern consisting of halftone dots.
上記実施例１〜４および比較例１．２による各導光板に
ついて、拡散層パターンの面積か最小である端面ＩＣに
、周囲を反射フィルム６で覆った冷陰極管５を設置し、
導光板の拡散層パターンを形成した面１ａに反射フィル
ム４を貼りあわせて、第２図に示すような面状光源装置
を作成した。For each of the light guide plates according to Examples 1 to 4 and Comparative Example 1.2, a cold cathode tube 5 whose periphery was covered with a reflective film 6 was installed on the end face IC where the area of the diffusion layer pattern was the smallest,
A reflective film 4 was bonded to the surface 1a of the light guide plate on which the diffusion layer pattern was formed, to produce a planar light source device as shown in FIG.
この面状光源装置について、拡散層パターンか目視によ
り識別できるかを判定し、さらに拡散層パターンが識別
できたものについては、拡散層バターンが識別できなく
なるような拡散フィルムを導光板の光出射面２ｂ上にの
せて、各導光板による平均輝度を色彩色度計Ｃ５−１０
０（ミノルタカメラ（株）製）にて測定した。For this planar light source device, it is determined whether the diffusion layer pattern can be visually identified, and if the diffusion layer pattern can be identified, a diffusion film is placed on the light exit surface of the light guide plate so that the diffusion layer pattern cannot be identified. 2b, and measure the average brightness from each light guide plate using a colorimeter C5-10.
0 (manufactured by Minolta Camera Co., Ltd.).
結果を表１に示した。尚、表中、網点線数はＬ／ｉｎｃ
ｈである。The results are shown in Table 1. In addition, in the table, the number of halftone lines is L/inc
It is h.
表１
＊１は拡散フィルム１００ＲＰＵ （（株）きもと製）
を使用
＊２は拡散フィルム７５ＰＢ（（株）きもと製）を使用
表１の結果より明かなように、従来法による導光板では
パターンが視認されてしまい、このパターンを消すため
に拡散フィルムを導光板の出射面に設ける必要があった
。このため拡散フィルムの透過率によって輝度が低下し
てしまった。Table 1 *1 is a diffusion film 100RPU (manufactured by Kimoto Co., Ltd.)
*2 uses a diffusion film 75PB (manufactured by Kimoto Co., Ltd.) As is clear from the results in Table 1, a pattern is visible on the light guide plate using the conventional method, and in order to erase this pattern, a diffusion film is used. It was necessary to provide it on the output surface of the light plate. For this reason, the brightness decreased due to the transmittance of the diffusion film.
一方、本発明による導光板の場合には拡散フィルムの必
要がな充分な輝度であった。On the other hand, the light guide plate according to the present invention had sufficient brightness without the need for a diffusion film.
［発明の効果コ
以上の実施例からも明らかなように本発明の面状光源用
導光板は、印刷法、写真法等を利用して導光板に適当な
光拡散層パターンを有する光拡散層を設けたので、面状
光源に適用した場合に他の拡散板を使用する必要がなく
、薄型で輝度の高い照明が得られる。[Effects of the Invention] As is clear from the above embodiments, the light guide plate for a planar light source of the present invention has a light diffusion layer that has an appropriate light diffusion layer pattern on the light guide plate using a printing method, a photographic method, etc. Therefore, when applied to a planar light source, there is no need to use another diffuser plate, and thin, high-brightness illumination can be obtained.
第１図は本発明の面状光源用導光板の一実施例を示す断
面図、第２図は本発明の他の実施例の面状光源用導光板
を用いた面状光源を示す断面図、第３図は本発明の面状
光源用導光板の光拡散層パターンを拡大した図である。
１・・・・・・透明板
２・・・・・・光拡散層
２“・・・・・パターン
２ａ・・・・光射出面
２ｃ・・・・入射面
３・・・・・・可撓性フィルム
４・・・・・・光源FIG. 1 is a sectional view showing one embodiment of a light guide plate for a planar light source according to the present invention, and FIG. 2 is a sectional view showing a planar light source using a light guide plate for a planar light source according to another embodiment of the present invention. , FIG. 3 is an enlarged view of the light diffusion layer pattern of the light guide plate for a planar light source according to the present invention. 1...Transparent plate 2...Light diffusion layer 2''...Pattern 2a...Light exit surface 2c...Incidence surface 3...Possible Flexible film 4...Light source
Claims (1)
る面を光射出面とする透明板と、該透明板の光射出面あ
るいは光射出面の反対面に設けられた光拡散層とから成
る導光板において、前記光拡散層は１００Ｌ／ｉｎｃｈ
〜３００Ｌ／ｉｎｃｈの網点から成る光拡散パターンを
有し且つ該光拡散パターンの面積が前記透明板を透過す
る光の光量が少なくなるに従って大きくなるように形成
されていることを特徴とする面状光源用導光板。 ２、前記光拡散層のパターンが、印刷法によって形成さ
れていることを特徴とする請求項１記載の面状光源用導
光板。 ３、前記光拡散層のパターンが、感光性組成物を用いて
写真法によって形成されていることを特徴とする請求項
１記載の面状光源用導光板。 ４、前記光拡散層が、あらかじめパターンを印刷法によ
って形成させた可撓性フィルムを貼り付けることによっ
て形成されることを特徴とする請求項１記載の面状光源
用導光板。 ５、光拡散層が、あらかじめパターンを感光性組成物を
用いた写真法によって形成させた可撓性フィルムを貼り
付けることによって形成されることを特徴とする請求項
１記載の面状光源用導光板。[Claims] 1. A transparent plate having at least one end surface as an incident surface and a surface perpendicular to the incident surface as a light exit surface, and a light exit surface of the transparent plate or a surface opposite to the light exit surface. In the light guide plate comprising a light diffusing layer, the light diffusing layer has a rate of 100 L/inch.
A surface having a light diffusion pattern consisting of halftone dots of ~300 L/inch, and the area of the light diffusion pattern increasing as the amount of light transmitted through the transparent plate decreases. Light guide plate for shaped light sources. 2. The light guide plate for a planar light source according to claim 1, wherein the pattern of the light diffusion layer is formed by a printing method. 3. The light guide plate for a planar light source according to claim 1, wherein the pattern of the light diffusion layer is formed by a photographic method using a photosensitive composition. 4. The light guide plate for a planar light source according to claim 1, wherein the light diffusion layer is formed by pasting a flexible film on which a pattern has been formed in advance by a printing method. 5. The planar light source guide according to claim 1, wherein the light diffusion layer is formed by pasting a flexible film on which a pattern has been formed in advance by a photographic method using a photosensitive composition. light board
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2331271A JPH04199001A (en) | 1990-11-29 | 1990-11-29 | Light guide plate for planar light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2331271A JPH04199001A (en) | 1990-11-29 | 1990-11-29 | Light guide plate for planar light source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04199001A true JPH04199001A (en) | 1992-07-20 |
Family
ID=18241827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2331271A Pending JPH04199001A (en) | 1990-11-29 | 1990-11-29 | Light guide plate for planar light source |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04199001A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06109925A (en) * | 1992-09-16 | 1994-04-22 | Internatl Business Mach Corp <Ibm> | Optical film and liquid crystal display device using above described optical film |
| JPH06230375A (en) * | 1993-01-29 | 1994-08-19 | Stanley Electric Co Ltd | Dot pattern forming method for light transmission plate |
| JPH0673733U (en) * | 1993-03-25 | 1994-10-18 | 恵和商工株式会社 | Light reflection sheet material |
| KR100381703B1 (en) * | 1993-11-05 | 2003-08-21 | 가부시키가이샤 엔프라스 | Surface light source device |
-
1990
- 1990-11-29 JP JP2331271A patent/JPH04199001A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06109925A (en) * | 1992-09-16 | 1994-04-22 | Internatl Business Mach Corp <Ibm> | Optical film and liquid crystal display device using above described optical film |
| JPH06230375A (en) * | 1993-01-29 | 1994-08-19 | Stanley Electric Co Ltd | Dot pattern forming method for light transmission plate |
| JPH0673733U (en) * | 1993-03-25 | 1994-10-18 | 恵和商工株式会社 | Light reflection sheet material |
| KR100381703B1 (en) * | 1993-11-05 | 2003-08-21 | 가부시키가이샤 엔프라스 | Surface light source device |
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