JPH063526A - Illuminating device - Google Patents
Illuminating deviceInfo
- Publication number
- JPH063526A JPH063526A JP4159403A JP15940392A JPH063526A JP H063526 A JPH063526 A JP H063526A JP 4159403 A JP4159403 A JP 4159403A JP 15940392 A JP15940392 A JP 15940392A JP H063526 A JPH063526 A JP H063526A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- plate
- transparent 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.)
- Withdrawn
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- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
- Optical Elements Other Than Lenses (AREA)
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は液晶表示装置等の表示の
視認性を向上させるために用いる面照明装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface lighting device used for improving the visibility of a display such as a liquid crystal display device.
【０００２】面照明装置には直下型、エッジライト型
（導光式）の２方式が一般的とされているが本発明はエ
ッジライト型に関するものである。エッジライト型の面
照明装置において使用される導光板には、光を出射する
ためにその背面に拡散反射層を形成している。この拡散
反射層は、面照明装置の発光を面上一様な輝度分布とす
るため光源からの距離に応じた面積率を持つ点状また
は、網目状等の拡散反射部分を形成し、その拡散反射部
分、非拡散反射部分の比率、つまり光源からの距離に応
じた拡散反射量の比率によって発光面上の位置に関係な
く一様な輝度分布を実現している。The surface lighting device is generally of two types, a direct type and an edge light type (light guide type), but the present invention relates to the edge light type. A light guide plate used in an edge light type surface lighting device has a diffuse reflection layer formed on its back surface for emitting light. This diffuse reflection layer forms a point-like or mesh-like diffuse reflection portion having an area ratio according to the distance from the light source in order to make the light emission of the surface lighting device have a uniform luminance distribution on the surface, and diffuse the light. A uniform luminance distribution is realized irrespective of the position on the light emitting surface by the ratio of the reflection part and the non-diffuse reflection part, that is, the ratio of the diffuse reflection amount according to the distance from the light source.
【０００３】従来、この拡散反射層は白色塗料やガラス
ビーズ入り塗料を印刷しその光拡散効果によって光を拡
散させ、光の全反射条件によって伝搬してきた光を前記
条件外とし出射光としていた。しかし、使用者の要求か
ら装置の薄型化が進み導光板が薄くなるに従いその印刷
誤差による面積率の狂いによって面照明装置の発光面に
生じる輝度ムラが顕著に現れ、特性の良い面照明装置を
得るには高精度な印刷技術を必要とし、生産性の向上、
低価格化を阻害していた。Conventionally, this diffuse reflection layer is printed with a white paint or a paint containing glass beads to diffuse the light by its light diffusion effect, and the light propagated under the condition of total reflection of light is out of the above conditions and is used as the outgoing light. However, as the device becomes thinner and the light guide plate becomes thinner due to the user's request, the unevenness of the brightness caused on the light emitting surface of the surface lighting device becomes noticeable due to the deviation of the area ratio due to the printing error, and the surface lighting device with good characteristics is provided. High-precision printing technology is required to obtain
It hindered price reduction.
【０００４】更に高輝度化を図るためには各部の反射
率、透過率等の光学特性を向上する必要があり、上記拡
散反射層についても同様に光学特性の向上、即ち、高輝
度化の新たなる手段が望まれている。In order to further increase the brightness, it is necessary to improve the optical characteristics such as reflectance and transmittance of each part. Similarly, the above-mentioned diffuse reflection layer also has improved optical characteristics, that is, a new method for increasing the brightness. A means to become is desired.
【０００５】[0005]
【従来の技術】従来のエッジライト型照明装置の構造を
図９に示す。同図において、１は導光板であり、主に透
明なアクリル樹脂からなり、その裏面には同図（ｂ）に
示すようなスクリーン印刷等の手法によって形成された
白色塗料等の光拡散性の塗料からなるドット２ａを有す
る拡散反射層２が形成されている。また同図（ａ）に示
すように拡散反射層２上には反射板３が設けられ、導光
板１の反対面には拡散板４が設けられている。2. Description of the Related Art The structure of a conventional edge light type lighting device is shown in FIG. In the figure, 1 is a light guide plate, which is mainly made of a transparent acrylic resin, and has a back surface on which a light-diffusing material such as white paint formed by a method such as screen printing shown in FIG. A diffuse reflection layer 2 having dots 2a made of paint is formed. Further, as shown in FIG. 3A, a reflection plate 3 is provided on the diffuse reflection layer 2, and a diffusion plate 4 is provided on the opposite surface of the light guide plate 1.
【０００６】５は蛍光管を用いた光源であり、その外周
には光源光を効率良く導光板１内に入射させるためアル
ミ、Ａｇ等の反射カバー６が配置されている。そして光
源５から出射した光は反射カバー６によって導光板１の
端面部分に集光され導光板１内に入射する。この入射し
た光は全反射の法則に従い臨界角内において導光板１内
を伝搬して行く。この伝搬光は前記全反射の条件が崩さ
れないかぎり外部出射光とはならないため上述した拡散
反射層２による拡散反射によって外部出射光となる。Reference numeral 5 denotes a light source using a fluorescent tube, and a reflection cover 6 made of aluminum, Ag, or the like is arranged on the outer periphery of the light source 5 in order to make the light source light efficiently enter the light guide plate 1. Then, the light emitted from the light source 5 is condensed on the end face portion of the light guide plate 1 by the reflection cover 6 and enters the light guide plate 1. The incident light propagates in the light guide plate 1 within the critical angle according to the law of total reflection. This propagating light does not become externally emitted light unless the condition of total reflection is broken, so that it becomes externally emitted light by the diffuse reflection by the diffuse reflection layer 2 described above.
【０００７】この出射された光は拡散板４によって更に
拡散され面照明としての輝度均一性を向上する。さらに
導光板１裏面側においては反射板３によって拡散板４か
ら、および拡散反射層２からの裏面への漏れ光を発光面
１ａへ反射し高輝度を図っている。なお前記の拡散反射
層２は発光面１ａ上において光源５に近いほど輝度が高
くなる傾向を防ぐため、種々の条件によって決定された
パターンとして形成されていることは周知である。The emitted light is further diffused by the diffusion plate 4 to improve the brightness uniformity as surface illumination. Further, on the rear surface side of the light guide plate 1, the leakage light from the diffusion plate 4 to the rear surface by the reflection plate 3 and from the diffusion reflection layer 2 is reflected to the light emitting surface 1a to achieve high brightness. It is well known that the diffuse reflection layer 2 is formed as a pattern determined by various conditions in order to prevent the brightness on the light emitting surface 1a from becoming higher as it gets closer to the light source 5.
【０００８】[0008]
【発明が解決しようとする課題】上記従来のエッジライ
ト型照明装置において、光源からの光を拡散する拡散反
射層２は、印刷手法によって形成されるため、輝度の均
一性を左右する拡散反射層の面積に誤差が生じ易く生産
性（歩留り）の低下を招く要因となっている。また、そ
の塗料による光吸収は導光板内の多重反射によって増大
し高輝度化を阻害している。In the above-mentioned conventional edge light type illuminating device, since the diffuse reflection layer 2 for diffusing light from the light source is formed by a printing method, the diffusion reflection layer which influences the uniformity of the brightness. Is likely to cause an error in the area, which is a factor of lowering productivity (yield). In addition, the light absorption by the paint is increased by multiple reflections in the light guide plate, which hinders high brightness.
【０００９】更に、光源光は導光板入射後、全て出射光
となることが光利用効率の点からも有利であるのに対
し、従来の拡散反射層による拡散では反射光の方向を制
御できないため導光板内の伝搬光の量を制御できず光源
側へ回帰させるか、あるいは複数の光源を持つものであ
れば他方の光源側へ光を到達させることになり高輝度化
を阻害している。Further, it is advantageous from the viewpoint of light utilization efficiency that the light source light is all emitted light after entering the light guide plate, whereas the conventional diffused reflection layer cannot control the direction of reflected light. The amount of propagating light in the light guide plate cannot be controlled and the light is returned to the light source side, or if the light source has a plurality of light sources, the light reaches the other light source side, which hinders high brightness.
【００１０】本発明は、高輝度で、且つ生産性の良い面
照明装置を実現しようとする。The present invention is intended to realize a surface lighting device having high brightness and good productivity.
【００１１】[0011]
【課題を解決するための手段】本発明は照明装置に於い
ては、少なくとも導光板１１と、その側面に配置された
光源１２とを具備して成る照明装置において、上記導光
板１１は、その光を出射する面に光拡散板２１が配設さ
れ、他方の面には略三角形状の凹部１４が線状あるいは
点状に形成され、さらに該面には該導光板１１より屈折
率の大きい材料で凹部１４を埋めるように透明層１６が
形成され、さらに該透明層１６の外表面には反射板１８
が配置あるいは一体化されて成ることを特徴とする。According to the present invention, there is provided an illuminating device comprising at least a light guide plate 11 and a light source 12 arranged on a side surface thereof, wherein the light guide plate 11 is A light diffusing plate 21 is disposed on the surface that emits light, and substantially triangular recesses 14 are formed on the other surface in a linear or dot shape, and the surface has a higher refractive index than the light guide plate 11. A transparent layer 16 is formed so as to fill the recess 14 with a material, and a reflective plate 18 is formed on the outer surface of the transparent layer 16.
Are arranged or integrated.
【００１２】また、本発明の照明装置に於いては、少な
くとも導光板１１と、その側面に配置された光源１２と
を具備して成る照明装置において、上記導光板１１は、
その光を出射する面に略三角形状の凹部３４が線状ある
いは点状に形成され、さらに該面には該導光板１１より
屈折率の大きい材料で凹部３４を埋めるように透明層３
６が形成され、さらに該透明層３６の外表面には光拡散
板３８が配設され、他方の面には反射板３２が設けられ
て成ることを特徴とする。Further, in the illuminating device of the present invention, in the illuminating device comprising at least the light guide plate 11 and the light source 12 arranged on the side surface thereof, the light guide plate 11 is:
A substantially triangular concave portion 34 is formed in a linear or dot shape on the light emitting surface, and the transparent layer 3 is formed on the surface so as to fill the concave portion 34 with a material having a refractive index higher than that of the light guide plate 11.
6, a light diffusion plate 38 is provided on the outer surface of the transparent layer 36, and a reflection plate 32 is provided on the other surface.
【００１３】また、本発明の照明装置に於いては、少な
くとも導光板１１と、その側面に配置された光源１２と
を具備して成る照明装置において、上記導光板１１は、
その光を出射する面に略三角形状の凹部３４が線状ある
いは点状に形成され、さらに該面には該導光板１１より
屈折率の大きい材料で凹部３４を埋めるように透明層３
６が形成され、さらに該透明層３６の外表面には光拡散
板３８が配設され、他方の面には略三角形状の凹部１４
が線状あるいは点状に形成され、さらに該面には該導光
板１１より屈折率の大きい材料で凹部１４を埋めるよう
に透明層１６が形成され、さらに該透明層１６の外表面
には反射板１８が配置あるいは一体化されて成ることを
特徴とする。またそれに加えて、前記導光板１１の面積
が最も大である２面の一方又は両方が傾斜していること
を特徴とする。Further, in the illuminating device of the present invention, in the illuminating device comprising at least the light guide plate 11 and the light source 12 arranged on the side surface thereof, the light guide plate 11 is:
A substantially triangular concave portion 34 is formed in a linear or dot shape on the light emitting surface, and the transparent layer 3 is formed on the surface so as to fill the concave portion 34 with a material having a refractive index higher than that of the light guide plate 11.
6 is formed, a light diffusing plate 38 is disposed on the outer surface of the transparent layer 36, and a substantially triangular recess 14 is formed on the other surface.
Are formed in a linear or dot shape, and a transparent layer 16 is formed on the surface so as to fill the recess 14 with a material having a refractive index larger than that of the light guide plate 11, and the outer surface of the transparent layer 16 is further reflective. The plate 18 is arranged or integrated. In addition to that, one or both of the two surfaces having the largest area of the light guide plate 11 are inclined.
【００１４】また、本発明の液晶表面装置に於いては、
上記照明装置４０と液晶表示パネル４１とを組み合わせ
て成ることを特徴とする。この構成を採ることにより、
高輝度で、且つ生産性の良い照明装置、及び該照明装置
を用いた液晶表示装置が得られる。In the liquid crystal surface device of the present invention,
The lighting device 40 and the liquid crystal display panel 41 are combined. By adopting this configuration,
It is possible to obtain a lighting device having high brightness and good productivity, and a liquid crystal display device using the lighting device.
【００１５】[0015]
【作用】本発明では、導光板１１の表面に線状又は点状
に設けた略三角形状の凹部に高屈折率層を形成したこと
により、光源１２から導光板１１内に入射した光は、屈
折及び反射を起こし、プリズム効果によって入射角度に
よらずほぼ一定の角度範囲に出射される。また反射効果
は屈折率差による反射および反射板による反射であるた
め、光吸収を低減でき、従って高輝度化が可能となる。In the present invention, the light having entered the light guide plate 11 from the light source 12 is formed by forming the high refractive index layer in the substantially triangular concave portion provided in the surface of the light guide plate 11 in the form of a line or a dot. Refraction and reflection occur, and the light is emitted in a substantially constant angle range regardless of the incident angle due to the prism effect. Further, since the reflection effect is the reflection due to the difference in the refractive index and the reflection due to the reflection plate, it is possible to reduce the light absorption, and thus it is possible to increase the brightness.
【００１６】[0016]
【実施例】図１は本発明の第１の実施例を示す図であ
り、（ａ）は断面図、（ｂ）は（ａ）図のＢ部拡大図、
（ｃ）は（ａ）図のＣ部拡大図、（ｄ）は（ａ）図のＤ
部拡大図である。同図においては、１１は導光板、１２
は該導光板の側面に配置された光源である。該光源１２
は例えば管径４ｍｍの冷陰極管が用いられ、その周囲に
は反射カバー１３が設けられている。反射カバー１３
は、厚さ０．５ｍｍのＡｌ板で形成され、その内面には
（ｂ）図の如く、厚さ１０００ÅのＡｇ薄膜反射層１３
ａを形成し、さらにその上に厚さ１００μｍのＰＥＴ樹
脂コートを保護層１３ｂとして施し、高反射性と耐久性
を持たせ、光源１２から出射された光を導光板１１の側
面に集光し、効率良く導光板内に入射させるようになっ
ている。1A and 1B are views showing a first embodiment of the present invention, in which FIG. 1A is a sectional view, FIG. 1B is an enlarged view of a portion B in FIG.
(C) is an enlarged view of part C of (a), and (d) is D of (a).
FIG. In the figure, 11 is a light guide plate, and 12
Is a light source arranged on the side surface of the light guide plate. The light source 12
For example, a cold cathode tube having a tube diameter of 4 mm is used, and a reflective cover 13 is provided around the cold cathode tube. Reflective cover 13
Is formed of an Al plate having a thickness of 0.5 mm, and the inner surface thereof has a thickness of 1000 Å as shown in FIG.
a is formed, and a PET resin coat having a thickness of 100 μm is further formed thereon as a protective layer 13b so as to have high reflectivity and durability, and the light emitted from the light source 12 is condensed on the side surface of the light guide plate 11. , Is made to enter the light guide plate efficiently.
【００１７】導光板１１には厚さ４ｍｍの透明なアクリ
ル樹脂板が用いられ、その一方の面（裏面）に（ｃ）図
に示すような頂角θが９０°の略三角形状の凹部１４が
光源１２の冷陰極管の線状方向と平行に線状（又は点
状）に形成されている。そして該凹部１４の配置は凹部
がある部分と無い部分の面積比率を次式となるようにし
ている。なお下式は従来用いられている実験式である。 面積率＝〔（−２．４２×１０-5×Ｌ2 ＋４．４２×１
０-3×Ｌ＋０．４）2〕-1 但し、Ｌ：光源からの距離 なお、上式は導光板１１端部から中央までの範囲に適応
させるもので、中央から対称に両端部までの範囲を設定
している。A transparent acrylic resin plate having a thickness of 4 mm is used for the light guide plate 11, and one surface (rear surface) of the concave portion 14 having a substantially triangular shape with an apex angle θ of 90 ° as shown in FIG. Are formed in a linear shape (or a dot shape) in parallel with the linear direction of the cold cathode tube of the light source 12. The arrangement of the recesses 14 is such that the area ratio of the portions with and without the recesses is expressed by the following equation. The following formula is an empirical formula used conventionally. Area ratio = [(-2.42 x 10 -5 x L 2 + 4.42 x 1
0 −3 × L + 0.4) 2 ] −1 where L is the distance from the light source Note that the above formula applies to the range from the end of the light guide plate 11 to the center, and the range from the center to both ends symmetrically. Is set.
【００１８】そして凹部１４が形成された面には、その
凹部１４を雌型とした場合の雄型となる凸部１５を一表
面に形成したポリカーボネイト樹脂からなる透明板１６
が導光板１１と同等の屈折率を有するアクリレート系透
明性の紫外線硬化型接着剤１７で一体となるように接着
されている。またこの透明板１６の外表面には厚さ約１
０００ÅのＡｇ薄膜反射層１８が形成され、さらにその
上にＰＥＴ樹脂で厚さ約１００μｍの保護層１９が形成
されているA transparent plate 16 made of a polycarbonate resin is provided on the surface on which the concave portion 14 is formed, and a convex portion 15 which is a male type when the concave portion 14 is a female type is formed on one surface.
Are bonded together with an acrylate-based transparent UV-curable adhesive 17 having a refractive index equivalent to that of the light guide plate 11. The outer surface of the transparent plate 16 has a thickness of about 1
A 000Å Ag thin film reflection layer 18 is formed, and a protective layer 19 of PET resin having a thickness of about 100 μm is further formed thereon.
【００１９】さらに導光板１１の他方の面（発光面２
０）には、該面２０から裏面に配置された凹部１４が視
認できないように隠蔽し、且つ輝度の均一性を向上させ
る目的から厚さ０．２５ｍｍで、その表面をシボ加工に
よって凹凸面としたポリカーボネイト樹脂フィルム（Ｇ
Ｅ社製レキサン８Ｂ３６）２１ａ，２１ｂを２枚重ねた
光拡散板２１が配置されている。Further, the other surface of the light guide plate 11 (light emitting surface 2
0) has a thickness of 0.25 mm for the purpose of concealing the concave portion 14 disposed on the back surface from the surface 20 so as not to be visible, and improving the uniformity of brightness, and the surface thereof is formed into an uneven surface by a texturing process. Polycarbonate resin film (G
A light diffusing plate 21 in which two Lexans 8B36) 21a, 21b manufactured by Company E are stacked is arranged.
【００２０】このように構成された本実施の作用を次に
説明する。先ず、光源１２から出射して導光板１１に入
射した光は従来と同様に全反射の法則に従い反射を繰り
返し導光板１１内を伝搬して行く。そしてこの光が凹部
１４に入射すると、該凹部１４が空気中に置いたプリズ
ムと同様の構造となっているため内部にて屈折、反射を
起こした後、発光面２０に対して垂直な方向から略±４
５°の範囲内に集光された図２のような特性を持つ出射
光となる。この出射光は導光板の表面１１ａに対しても
４５°以内となるため、本実施例の全反射条件 φc ＝ｓｉｎ-1（Ｎ1 ／Ｎ2 ）≒４２° 但し：空気の屈折率Ｎ1 ＝１ 導光板の屈折率Ｎ2 ＝１．４９１ から前記出射光のほとんどは発光面２０への直接出射光
となる。The operation of the present embodiment thus configured will be described below. First, the light emitted from the light source 12 and incident on the light guide plate 11 is repeatedly reflected and propagates in the light guide plate 11 according to the law of total reflection as in the conventional case. Then, when this light enters the concave portion 14, the concave portion 14 has a structure similar to that of a prism placed in the air, so that the light is internally refracted and reflected, and then from a direction perpendicular to the light emitting surface 20. Approximately ± 4
The emitted light has the characteristics as shown in FIG. 2 and is condensed within the range of 5 °. Since this emitted light is also within 45 ° with respect to the surface 11a of the light guide plate, the total reflection condition of the present embodiment φ c = sin −1 (N 1 / N 2 ) ≈42 ° where: Refractive index N of air 1 = 1 Because of the refractive index N 2 = 1.491 of the light guide plate, most of the emitted light is directly emitted to the light emitting surface 20.
【００２１】但し、一部については、臨界角内であるか
ら発光面２０への出射光とはならないが伝搬光となり輝
度の均一性を向上させる効果を担っている。このように
して得られた発光面２０上の出射光は前述した凹部１４
が面積率によって配置しているため，マクロ的には位置
によらずほぼ一定となる。However, a part of the light is not a light emitted to the light emitting surface 20 because it is within the critical angle, but it becomes a propagating light and has an effect of improving the uniformity of luminance. The emitted light on the light emitting surface 20 obtained in this manner is the same as the concave portion 14 described above.
Since they are arranged according to the area ratio, they are almost constant regardless of the position in terms of macro.
【００２２】以上の本実施例によれば光源１２からの光
の大部分が凹部１４のプリズム効果により発光面２０か
ら出射されるため従来に比して輝度は向上する。また導
光板の製造は構造上から一般的な樹脂成形技術を主とす
るため容易となり生産性の向上が可能となる。According to the present embodiment described above, most of the light from the light source 12 is emitted from the light emitting surface 20 by the prism effect of the recess 14, so that the brightness is improved as compared with the conventional case. In addition, the manufacturing of the light guide plate is easy because the structure is generally made of a general resin molding technique, and the productivity can be improved.
【００２３】図３は本発明の第２の実施例を示す断面図
である。本実施例は基本的には前実施例と同様であり、
異なるところは、光源１２を１個とし、該導光板の光源
の配置されていない方の端面に反射板としてアルミ蒸着
テープ２２を貼り付け、該反射板による反射光が疑似的
に光源と仮定できる構成としたことである。本実施例に
よれば前実施例と同様な効果が得られる。FIG. 3 is a sectional view showing a second embodiment of the present invention. This embodiment is basically the same as the previous embodiment,
The difference is that one light source 12 is provided, and aluminum vapor deposition tape 22 is attached as a reflector to the end surface of the light guide plate on the side where the light source is not arranged, and the light reflected by the reflector can be assumed to be a pseudo light source. That is the structure. According to this embodiment, the same effect as the previous embodiment can be obtained.
【００２４】図４は本発明の第３の実施例を示す図で、
（ａ）は断面図、（ｂ）は（ａ）図のＢ部拡大図、
（ｃ）は（ａ）図のＣ部拡大図である。本実施例は指向
性の高い照明光が得られる構成であり、基本的構成は第
１の実施例における導光板を表裏逆の配置としたもので
ある。即ち導光板１１の裏面は平面とし、その上にＡｇ
薄膜反射層３２を約１０００Åの厚さで形成し、更に外
表面には厚さ約１００μｍのＰＥＴ樹脂を保護層３３と
して形成している。FIG. 4 is a diagram showing a third embodiment of the present invention.
(A) is a cross-sectional view, (b) is an enlarged view of part B in (a),
(C) is an enlarged view of part C of FIG. The present embodiment has a configuration in which illumination light with high directivity can be obtained, and the basic configuration is that the light guide plates in the first embodiment are arranged upside down. That is, the back surface of the light guide plate 11 is a flat surface and Ag is
The thin film reflection layer 32 is formed to a thickness of about 1000Å, and a PET resin having a thickness of about 100 μm is formed as a protective layer 33 on the outer surface.
【００２５】導光板１１の発光面１１ａには略三角形状
の凹部３４を第１の実施例と同様に線状に配置し、該面
に該凹部３４を雌型とした場合の雄型となる凸部３５を
一表面に形成したポリカーボネイト樹脂からなる透明板
３６を、導光板１１と同等の屈折率を有するアクリレー
ト系透明性の紫外線硬化型接着剤３７にて接着一体化し
ている。さらに透明板３６の上には、厚さ０．２５ｍｍ
で、その表面をシボ加工によって凹凸面としたポリカー
ボネイト樹脂フィルム（ＧＥ社製レキサン８Ａ１３）を
光拡散板３８として配置し、前記凹部３４がなす線状模
様を若干穏蔽するとともに輝度の均一化を図っている。
なお本実施例では凹部３４の形状を（ｂ）図に示すよう
に頂角θｂを７０°とした略三角形状とした。A substantially triangular recess 34 is linearly arranged on the light emitting surface 11a of the light guide plate 11 in the same manner as in the first embodiment, and the recess 34 is formed into a female shape on the surface, which is a male shape. A transparent plate 36 made of a polycarbonate resin having a convex portion 35 formed on one surface is bonded and integrated with an acrylate-based transparent ultraviolet curable adhesive 37 having a refractive index equivalent to that of the light guide plate 11. Furthermore, on the transparent plate 36, a thickness of 0.25 mm
Then, a polycarbonate resin film (Lexan 8A13 manufactured by GE Co., Ltd.), the surface of which has an uneven surface by texture processing, is arranged as the light diffusing plate 38, and the linear pattern formed by the concave portion 34 is somewhat moderated and the brightness is made uniform. I am trying.
In this embodiment, the concave portion 34 has a substantially triangular shape with an apex angle θb of 70 ° as shown in FIG.
【００２６】このように構成された本実施例は、第１の
実施例と同様にプリズム効果が得られる。さらに本実施
例にあっては出射光の大半が発光面１１ａに対して垂直
な方向に対して約±１２°の範囲の指向性光が得られ
る。上記指向性光はレンズ等の光学手法を容易に施すこ
とができ、特に液晶表示装置への適用においては、レン
ズによる集光を行い表示面上の各ドットにある開口部分
へ効率良く入射させることが可能となる。これにより液
晶表示装置内の光利用の効率の向上、高輝度化、薄型
化、省電力化が図れる。また指向性光を液晶パネルを通
過したのちに拡散する手法を用いれば視覚に係わらず良
好な表示特性を得ることができる。In this embodiment thus constructed, the prism effect can be obtained as in the first embodiment. Further, in this embodiment, most of the emitted light is directional light in the range of about ± 12 ° with respect to the direction perpendicular to the light emitting surface 11a. The above-mentioned directional light can be easily subjected to an optical method such as a lens, and particularly when applied to a liquid crystal display device, it is condensed by the lens and is efficiently incident on the opening portion in each dot on the display surface. Is possible. As a result, the efficiency of light utilization in the liquid crystal display device can be improved, the brightness can be increased, the thickness can be reduced, and the power can be saved. Further, if a method of diffusing directional light after passing through the liquid crystal panel is used, good display characteristics can be obtained regardless of the visual sense.
【００２７】図５は本発明の第４の実施例を示す図であ
り、（ａ）は断面図、（ｂ）は（ａ）図のＢ部拡大図、
（ｃ）は（ａ）のＣ部拡大図である。同図において図１
及び図４と同一部分は同一符号を付して示した。本実施
例は図１に示す第１の実施例と図４に示す第３の実施例
とを組み合わせたものである。即ち、導光板１１の裏面
は第１の実施例と同様な構成を用い、発光面側は第３の
実施例を用いている。従って本実施例の効果は第１、第
３の実施例の効果を併せ持っている。5A and 5B are views showing a fourth embodiment of the present invention, wherein FIG. 5A is a sectional view, FIG. 5B is an enlarged view of part B of FIG.
(C) is an enlarged view of C part of (a). In FIG.
The same parts as those in FIG. 4 are indicated by the same reference numerals. This embodiment is a combination of the first embodiment shown in FIG. 1 and the third embodiment shown in FIG. That is, the back surface of the light guide plate 11 has the same structure as that of the first embodiment, and the light emitting surface side thereof has the third embodiment. Therefore, the effects of this embodiment have the effects of both the first and third embodiments.
【００２８】図６は本発明の第５の実施例を示す断面図
である。同図において図１と同一部分は同一符号を付し
て示した。本実施例は基本的には第１の実施例と同様で
あり、異なるところは、導光板１１の上面を傾斜面とし
て光の利用効率を向上したことである。FIG. 6 is a sectional view showing the fifth embodiment of the present invention. In the figure, the same parts as those in FIG. 1 are designated by the same reference numerals. This embodiment is basically the same as the first embodiment, except that the upper surface of the light guide plate 11 is an inclined surface to improve the light utilization efficiency.
【００２９】図７は本発明の第６の実施例を示す断面図
である。同図において図４と同一部分は同一符号を付し
て示した。本実施例は基本的には第３の実施例と同様で
あり、異なるところは、導光板１１の下面を傾斜面とし
て光の利用効率を向上したことである。なお本実施例及
び前実施例においては凹部の形成されていない面を傾斜
面としたが、凹部を有する面を傾斜面としても良く、そ
の場合も導光板の入射端面から対向対面への直接到達光
をも有効利用できるものである。FIG. 7 is a sectional view showing a sixth embodiment of the present invention. In the figure, the same parts as those in FIG. 4 are designated by the same reference numerals. This embodiment is basically the same as the third embodiment, except that the lower surface of the light guide plate 11 is an inclined surface to improve the light utilization efficiency. In the present embodiment and the previous embodiment, the surface in which the concave portion is not formed is the inclined surface, but the surface having the concave portion may be the inclined surface, and in this case also, it is possible to directly reach the facing facing surface from the incident end surface of the light guide plate. Light can also be used effectively.
【００３０】図８は本発明の照明装置を液晶表示装置の
面照明装置に適用した実施例を示す図である。本実施例
は本発明の照明装置４０を液晶パネル部４１と組み合わ
せて鋼板製の化粧カバー４２で一体化したもので、高輝
度化、軽量化、薄型化、省電力化を実現したものであ
る。なお、液晶パネル部４１を駆動する回路部等は液晶
パネル部として示し、説明は省略した。また図は照明装
置４０として第１の実施例を用いているが、他の実施例
を用いることができることは勿論である。FIG. 8 is a diagram showing an embodiment in which the lighting device of the present invention is applied to a surface lighting device of a liquid crystal display device. In this embodiment, the lighting device 40 of the present invention is combined with a liquid crystal panel portion 41 and integrated with a decorative cover 42 made of a steel plate, which realizes high brightness, weight reduction, thinning, and power saving. . It should be noted that the circuit section or the like for driving the liquid crystal panel section 41 is shown as a liquid crystal panel section, and description thereof is omitted. Further, although the drawing uses the first embodiment as the illuminating device 40, it goes without saying that other embodiments can be used.
【００３１】以上の各実施例において、各部の材料を指
定したが、これに限定されるものではなく、例えば導光
板にポリスチレン、ポリカーボネイト等他の透明体を適
用する、あるいは反射板として白色塗料やＡｌ、Ａｕ、
Ｃｒ等の金属層を適用しても良い。また、導光板上に形
成した略三角形状の凹部の形状も所望の特性に応じて設
計されるものであるから、種々の角度を設定することが
できる。つまり、本発明は一般照明、看板用照明等の用
途や、使用する光源および装置形状に限定されず、要は
光を入射させた透明板の表面に凹部を形成し、該凹部を
有する面に該透明板よりも高屈折率な層を設けることに
よりプリズム効果を得、光を制御する手段を提供するも
のである。In each of the above embodiments, the material of each part is designated, but the material is not limited to this. For example, another transparent material such as polystyrene or polycarbonate is applied to the light guide plate, or white paint or a reflective plate is used. Al, Au,
A metal layer such as Cr may be applied. Further, since the shape of the substantially triangular recess formed on the light guide plate is also designed according to desired characteristics, various angles can be set. That is, the present invention is not limited to applications such as general lighting, signboard lighting, and the like, and the light source and device shape to be used. In short, a recess is formed on the surface of a transparent plate on which light is incident, and By providing a layer having a higher refractive index than the transparent plate, a prism effect is obtained and a means for controlling light is provided.
【００３２】[0032]
【発明の効果】本発明に依れば、出射光となる導光板内
の反射光の角度までも制御でき、塗料等の光吸収を排除
できるため高輝度、高生産性の面照明装置を得ることが
できるばかりでなく、前記効果とともに薄型化が可能と
なる。さらに、設計によっては高指向性の照明光を得る
こともできる。According to the present invention, even the angle of the reflected light in the light guide plate which becomes the emitted light can be controlled and the absorption of light such as paint can be eliminated, so that a surface illuminating device of high brightness and high productivity can be obtained. Not only can it be achieved, but also thinning can be achieved along with the above effects. Furthermore, depending on the design, it is possible to obtain illumination light with high directivity.
【図１】本発明の第１の実施例を示す図で、（ａ）は断
面図、（ｂ）は（ａ）図のＢ部拡大図、（ｃ）は（ａ）
図のＣ部拡大図（ｄ）は（ａ）図のＤ部拡大図である。1A and 1B are views showing a first embodiment of the present invention, in which FIG. 1A is a sectional view, FIG. 1B is an enlarged view of part B in FIG. 1A, and FIG.
The enlarged view of the C section in the figure (d) is an enlarged view of the D section in the (a) figure.
【図２】本発明の第１の実施例に用いた導光板の略三角
形状の凹部による反射光角度特性を示す図である。FIG. 2 is a diagram showing an angle characteristic of reflected light by a substantially triangular recess of the light guide plate used in the first embodiment of the present invention.
【図３】本発明の第２の実施例を示す断面図である。FIG. 3 is a sectional view showing a second embodiment of the present invention.
【図４】本発明の第３の実施例を示す図で、（ａ）は断
面図、（ｂ）は（ａ）図のＢ部拡大図、（ｃ）は（ａ）
図のＣ部拡大図である。4A and 4B are views showing a third embodiment of the present invention, in which FIG. 4A is a sectional view, FIG. 4B is an enlarged view of part B of FIG. 4A, and FIG.
It is a C section enlarged view of a figure.
【図５】本発明の第４の実施例を示す図で、（ａ）は断
面図、（ｂ）は（ａ）図のＢ部拡大図、（ｃ）は（ａ）
図のＣ部拡大図である。5A and 5B are views showing a fourth embodiment of the present invention, wherein FIG. 5A is a sectional view, FIG. 5B is an enlarged view of part B of FIG. 5A, and FIG.
It is a C section enlarged view of a figure.
【図６】本発明の第５の実施例を示す断面図である。FIG. 6 is a sectional view showing a fifth embodiment of the present invention.
【図７】本発明の第６の実施例を示す断面図である。FIG. 7 is a sectional view showing a sixth embodiment of the present invention.
【図８】本発明の照明装置を液晶表示装置の面照明装置
に適用した実施例を示す断面図である。FIG. 8 is a cross-sectional view showing an embodiment in which the lighting device of the present invention is applied to a surface lighting device of a liquid crystal display device.
【図９】従来のエッジライト型照明装置の構造を示す図
で、（ａ）は断面図（ｂ）は（ａ）図の拡散反射層を示
す平面図である。FIG. 9 is a view showing a structure of a conventional edge light type illumination device, FIG. 9A is a sectional view, and FIG. 9B is a plan view showing a diffuse reflection layer of FIG. 9A.
１１…導光板 １２…光源 １３…反射カバー １４，３４…凹部 １５，３５…凸部 １６，３６…透明板 １７，３７…接着剤 １３ａ，１８，３２…Ａｇ薄膜反射層 １３ｂ，１９，３３…保護層 ２０…発光面 ２１，３８…光拡散板 ２２…アルミ蒸着テープ ４０…照明装置 ４１…液晶パネル部 ４２…化粧カバー 11 ... Light guide plate 12 ... Light source 13 ... Reflective cover 14, 34 ... Recessed portion 15, 35 ... Convex portion 16, 36 ... Transparent plate 17, 37 ... Adhesive agent 13a, 18, 32 ... Ag thin film reflective layer 13b, 19, 33 ... Protective layer 20 ... Light emitting surface 21, 38 ... Light diffusing plate 22 ... Aluminum vapor deposition tape 40 ... Lighting device 41 ... Liquid crystal panel part 42 ... Decorative cover
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｆ２１Ｖ 8/00 Ｄ 6908−3Ｋ (72)発明者 伊藤 高英 神奈川県川崎市中原区上小田中1015番地 富士通株式会社内─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 5 Identification number Internal reference number FI technical display location // F21V 8/00 D 6908-3K (72) Inventor Takahide Ito Nakahara, Kawasaki, Kanagawa 1015 Odanaka, Fujitsu Limited
Claims (5)
に配置された光源（１２）とを具備して成る照明装置に
おいて、 上記導光板（１１）は、その光を出射する面に光拡散板
（２１）が配設され、他方の面には、略三角形状の凹部
（１４）が線状あるいは点状に形成され、さらに、該面
には該導光板（１１）より屈折率の大きい材料で凹部
（１４）を埋めるように透明層（１６）が形成され、さ
らに該透明層（１６）の外表面には反射板（１８）が配
置あるいは一体化されて成ることを特徴とする照明装
置。1. A lighting device comprising at least a light guide plate (11) and a light source (12) arranged on a side surface of the light guide plate, wherein the light guide plate (11) diffuses light on a surface from which the light is emitted. A plate (21) is provided, and a substantially triangular recess (14) is formed in a linear or dot shape on the other surface, and the surface has a larger refractive index than the light guide plate (11). Illumination characterized in that a transparent layer (16) is formed so as to fill the recess (14) with a material, and a reflection plate (18) is arranged or integrated on the outer surface of the transparent layer (16). apparatus.
に配置された光源（１２）とを具備して成る照明装置に
おいて、 上記導光板（１１）は、その光を出射する面に略三角形
状の凹部（３４）が線状あるいは点状に形成され、さら
に該面には該導光板（１１）より屈折率の大きい材料で
凹部（３４）を埋めるように透明層（３６）が形成さ
れ、さらに該透明層（３６）の外表面には光拡散板（３
８）が配設され、他方の面には反射板（３２）が設けら
れて成ることを特徴とする照明装置。2. A lighting device comprising at least a light guide plate (11) and a light source (12) arranged on a side surface thereof, wherein the light guide plate (11) has a substantially triangular surface on which the light is emitted. The concave portion (34) having a shape is formed in a linear shape or a dot shape, and a transparent layer (36) is formed on the surface so as to fill the concave portion (34) with a material having a refractive index larger than that of the light guide plate (11). , And a light diffusion plate (3) on the outer surface of the transparent layer (36).
8) is provided, and a reflecting plate (32) is provided on the other surface of the lighting device.
に配置された光源（１２）とを具備して成る照明装置に
おいて、 上記導光板（１１）は、その光を出射する面に略三角形
状の凹部（３４）が線状あるいは点状に形成され、さら
に該面には該導光板（１１）より屈折率の大きい材料で
凹部（３４）を埋めるように透明層（３６）が形成さ
れ、さらに該透明層（３６）の外表面には光拡散板（３
８）が配設され、他方の面には、略三角形状の凹部（１
４）が線状あるいは点状に形成され、さらに該面には該
導光板（１１）より屈折率の大きい材料で凹部（１４）
を埋めるように透明層（１６）が形成され、さらに該透
明層（１６）の外表面には反射板（１８）が配置あるい
は一体化されて成ることを特徴とする照明装置。3. A lighting device comprising at least a light guide plate (11) and a light source (12) arranged on a side surface thereof, wherein the light guide plate (11) has a substantially triangular surface on which the light is emitted. The concave portion (34) having a shape is formed in a linear shape or a dot shape, and a transparent layer (36) is formed on the surface so as to fill the concave portion (34) with a material having a refractive index larger than that of the light guide plate (11). , And a light diffusion plate (3) on the outer surface of the transparent layer (36).
8) is provided, and the other surface has a substantially triangular recess (1
4) is formed in a linear shape or a dot shape, and a concave portion (14) made of a material having a refractive index larger than that of the light guide plate (11) is formed on the surface.
An illuminating device, characterized in that a transparent layer (16) is formed so as to fill the transparent layer (16), and a reflection plate (18) is arranged or integrated on the outer surface of the transparent layer (16).
る２面の一方又は両方が傾斜していることを特徴とする
請求項１，２または３の照明装置。4. The lighting device according to claim 1, wherein one or both of the two surfaces having the largest area of the light guide plate (11) are inclined.
（４０）と液晶表示パネル（４１）とを組み合せて成る
ことを特徴とする液晶表示装置。5. A liquid crystal display device comprising a combination of the lighting device (40) according to claim 1, 2, 3 or 4 and a liquid crystal display panel (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4159403A JPH063526A (en) | 1992-06-18 | 1992-06-18 | Illuminating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4159403A JPH063526A (en) | 1992-06-18 | 1992-06-18 | Illuminating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH063526A true JPH063526A (en) | 1994-01-14 |
Family
ID=15693013
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4159403A Withdrawn JPH063526A (en) | 1992-06-18 | 1992-06-18 | Illuminating device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH063526A (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2720089A1 (en) * | 1994-05-19 | 1995-11-24 | Ohbayashi Corp | Management system for water barrier sheet |
| JPH09184920A (en) * | 1995-12-28 | 1997-07-15 | Fujitsu Kasei Kk | Back light unit |
| JP2000214792A (en) * | 1999-01-26 | 2000-08-04 | Ohtsu Tire & Rubber Co Ltd :The | Back light unit, back light, and space sheet used for the same |
| JP2007324144A (en) * | 1995-06-27 | 2007-12-13 | Solid State Opto Ltd | Light-emitting panel assembly |
| US7537370B2 (en) | 1995-06-27 | 2009-05-26 | Solid State Opto Limited | Light emitting panel assemblies |
| US7810982B2 (en) * | 1999-02-23 | 2010-10-12 | Rambus International Ltd. | Edge-lit optical system having optical elements on two surfaces |
| US7898613B2 (en) | 2005-11-16 | 2011-03-01 | Lg Display Co., Ltd. | Backlight unit and liquid crystal display device comprising light guide panel having prism patterns |
| JP2012204139A (en) * | 2011-03-25 | 2012-10-22 | Dainippon Printing Co Ltd | Backlight and display device |
| US9625633B2 (en) | 2003-06-23 | 2017-04-18 | Rambus Delaware Llc | Light emitting panel assemblies |
-
1992
- 1992-06-18 JP JP4159403A patent/JPH063526A/en not_active Withdrawn
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2720089A1 (en) * | 1994-05-19 | 1995-11-24 | Ohbayashi Corp | Management system for water barrier sheet |
| NL1000366C2 (en) * | 1994-05-19 | 1997-07-07 | Ohbayashi Corp | Management system for a water barrier sheet. |
| JP2007324144A (en) * | 1995-06-27 | 2007-12-13 | Solid State Opto Ltd | Light-emitting panel assembly |
| US7537370B2 (en) | 1995-06-27 | 2009-05-26 | Solid State Opto Limited | Light emitting panel assemblies |
| JPH09184920A (en) * | 1995-12-28 | 1997-07-15 | Fujitsu Kasei Kk | Back light unit |
| JP2000214792A (en) * | 1999-01-26 | 2000-08-04 | Ohtsu Tire & Rubber Co Ltd :The | Back light unit, back light, and space sheet used for the same |
| US7810982B2 (en) * | 1999-02-23 | 2010-10-12 | Rambus International Ltd. | Edge-lit optical system having optical elements on two surfaces |
| US8092068B2 (en) | 1999-02-23 | 2012-01-10 | Rambus International Ltd. | Light redirecting films and film systems |
| US8845176B2 (en) | 1999-02-23 | 2014-09-30 | Rambus Delaware Llc | Light redirecting films with non-prismatic optical elements |
| US9625633B2 (en) | 2003-06-23 | 2017-04-18 | Rambus Delaware Llc | Light emitting panel assemblies |
| US9983340B2 (en) | 2003-06-23 | 2018-05-29 | Rambus Delaware Llc | Light emitting panel assemblies |
| US7898613B2 (en) | 2005-11-16 | 2011-03-01 | Lg Display Co., Ltd. | Backlight unit and liquid crystal display device comprising light guide panel having prism patterns |
| KR101277917B1 (en) * | 2005-11-16 | 2013-06-21 | 엘지디스플레이 주식회사 | Back Light Unit and Liquid Crystal Display using the same |
| JP2012204139A (en) * | 2011-03-25 | 2012-10-22 | Dainippon Printing Co Ltd | Backlight and display device |
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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: 19990831 |