JP2002196151A - Light guide plate - Google Patents

Light guide plate

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Publication number
JP2002196151A
JP2002196151A JP2000393852A JP2000393852A JP2002196151A JP 2002196151 A JP2002196151 A JP 2002196151A JP 2000393852 A JP2000393852 A JP 2000393852A JP 2000393852 A JP2000393852 A JP 2000393852A JP 2002196151 A JP2002196151 A JP 2002196151A
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JP
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Patent type
Prior art keywords
light
guide plate
light guide
surface
side surface
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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
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JP2000393852A
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Japanese (ja)
Inventor
Junji Miyashita
純司 宮下
Original Assignee
Citizen Electronics Co Ltd
株式会社シチズン電子
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    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
    • G02B6/00Light guides
    • G02B6/0001Light guides specially adapted for lighting devices or systems
    • G02B6/0011Light guides specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016Grooves, prisms, gratings, scattering particles or rough surfaces

Abstract

PROBLEM TO BE SOLVED: To improve the problem of the luminance of illuminating light which is generated from a light guide plate becomes ununiform, depending on the place when a light-emitting source, such as an LED is arranged extremely close to the light guide plate in order to raise luminance of illuminating light in a surface illuminant source of an edge light system.
SOLUTION: In the light guide plate 1, which is composed of a plate-like translucent material and which exits surface illuminating light 15 from the main surface 1b to an object 7 to be illuminated by changing the optical path of light from the light-emitting source 2 arranged facing the side surface, projecting and recessing parts are provided in the side surface 1c of the light guide plate facing the light-emitting source 2.
COPYRIGHT: (C)2002,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】この発明は例えば液晶パネルを背面より照射する面状光源に用いられる導光板に関する。 TECHNICAL FIELD The present invention is for example about light guide plate used in a planar light source for illuminating from the back of the liquid crystal panel.

【0002】 [0002]

【従来の技術】近年、ブック型のワードプロセッサやコンピュータ、又は携帯電話機、携帯TVのような小型、薄型の情報機器の表示装置として、薄型でしかも見易いバックライト機構を有する液晶表示装置が用いられている。 In recent years, book-type word processor or computer, or a cellular phone, compact such as a portable TV, a display device of a thin information devices, liquid crystal display device is used with Backlight for reading mechanism also only a thin there. このようなバックライト機構としては、液晶パネルを背後から全面にわたり照射する面状光源が用いられており、この面状光源としては蛍光ランプ又はLED(発光ダイオード)よりなる発光源と、その光束を液晶パネルに照射する面状の光束に変換する導光板よりなるものが一般的である。 As such a backlight mechanism, a planar light source for irradiating the entire surface of the liquid crystal panel from behind is used and a light emitting source consisting of a fluorescent lamp or LED (light emitting diode) as the planar light source, the light flux made from the light guide plate to convert the surface light beam to be irradiated to the liquid crystal panel is generally used. この中で、特に近年は、更なる小型、 In this, especially in recent years, a further compact,
薄型化と長寿命化を目的として発光源としてLED等を用いた面状光源が多く使用されるようになってきている。 LED planar light source using the like have come to be widely used as a light emitting source for the purpose of thinning and long life.

【0003】図6はこのようなうなLED等の発光源を複数個、導光板の側面に配してなるエッジライト方式の面状光源において従来知られているものの構成を示す図であり、(a)は上面図、(b)は(a)におけるA− [0003] Figure 6 is a diagram showing the structure of those conventionally known in the surface light source of the edge light type formed by arranging light emitting source, such as such will Do LED plurality, the side surface of the light guide plate, ( a) is a top view, in (b) is (a) A-
A断面図である。 A is a cross-sectional view.

【0004】図6において、110は面状光源であり、 [0004] In FIG. 6, 110 is a surface light source,
導光板101と発光源として3個のLED102を有している。 3 has a LED102 as a light emitting source and the light guide plate 101. 導光板101は無色透明なプラスチック材等の透光部材よりなる板状で略直方体形状をしており、その一方の主面を光出射面101bとし、該光出射面101 The light guide plate 101 has a substantially rectangular parallelepiped plate-like made of a transparent member such as a colorless transparent plastic material, the major surface of the one light emitting surface 101b, the light exit surface 101
bと対向する面には、発光源からの光を前記光出射面1 The b and opposing surfaces, the light emitting surface light from the light emitting source 1
01bに向けて反射させるための手段として、その表面に複数の微小なシボ又は複数個の半球状ドット等を有する光反射面101aが形成されている。 As a means for reflecting toward the 01b, the light reflection surface 101a is formed with a plurality of small grain or a plurality of hemispherical dots or the like on the surface thereof. 光出射面101 Light emitting surface 101
bは鏡面仕上げされている。 b are mirror-finished. 101c、101d、10 101c, 101d, 10
1e、101fは導光板101の側面であり、鏡面仕上げされている。 1e, 101f is a side of the light guide plate 101, is mirror finished. 3個のLED102はLED基板103 Three of LED102 the LED substrate 103
に支持されて導光板101の1つの側面101cに対向する位置に配設されている。 Is disposed at a position facing is supported on one side 101c of the light guide plate 101 to the.

【0005】図示しない駆動回路より所定の電流がLE [0005] predetermined current from the drive circuit (not shown) LE
D102に供給されるとLED102は所定の色の光を発光、出射する。 When fed to D102 LED 102 is emitting light of a predetermined color is emitted. LED102からの出射光は前記側面101cから導光板101に入り、図6(b)に示すように(大部分の光は)上面である光出射面101bで全反射、下面である光反射面101aでは全反射又は乱反射を繰り返しながら、図6(a)に示すように側面10 The light emitted from LED102 enters the light guide plate 101 from the side surface 101c, as shown in FIG. 6 (b) (most of the light) totally reflected on the light exit surface 101b is a top, a light reflecting surface 101a is a bottom in while repeating total reflection or irregular reflection, side 10 as shown in FIG. 6 (a)
1d又は101f、又は101eに向かって進行し、これらの側面で反射されて他の側面に向かって進行し、その進行の経路が広く導光板内に伝播される。 1d or 101f, or proceeds toward 101e, is reflected by these aspects and proceeds toward the other side, the path of the progress is propagated widely the light guide plate. このような伝播の際、導光板101の底面である光反射面101a During such propagation, the light reflecting surface 101a is a bottom of the light guide plate 101
に設けられたシボ等により反射又は屈折した光が導光板の上面である光出射面101bから照明光105として外部に出射する。 It reflected or refracted light is emitted to the outside as illumination light 105 from the light emitting surface 101b which is the upper surface of the light guide plate by graining or the like provided. 外部に出射した照明光105は(b) Illumination light 105 emitted to the outside (b)
に示すように液晶パネル107を背後から照明する。 Illuminating the liquid crystal panel 107 from behind as shown in FIG.

【0006】 [0006]

【発明が解決しようとする課題】ここで、照明光105 THE INVENTION Problems to be Solved] Here, the illumination light 105
の明るさを上げるには図6に示すように、LED102 To increase the brightness of the as shown in FIG. 6, LED 102
と導光板101の距離(d)を極力小さくすることが望ましい。 It is desirable to minimize the distance of the light guide plate 101 (d) is a. 距離を小さくするほどLED102に対する導光板101の立体角が増え、導光板101に入射するL Distance solid angle of the light guide plate 101 is increased for LED102 smaller the, L entering the light guide plate 101
ED102の光束が増えるからである。 The luminous flux of ED102 is because increases. しかしながら、 However,
前記の距離dを小さくして行くと次のような問題を生ずる。 When going to reduce the distance d results in the following problems.

【0007】LED102の発光の対向側面101cへ入射した光は屈折により当該対向側面を透過し導光板1 [0007] Light incident on the opposite sides 101c of the LED102 the emission transmitted through the opposite side by the refractive light guide plate 1
01内に出射する。 It is emitted in the 01. この際、入射角θ1と出射角θ2の関係は、空気の屈折率は1であるので導光板の屈折率をn2としたとき、スネルの定理により sinθ1×1= sinθ2×n2 ・・・・・(1) の関係があり、プラスチック材等よりなる導光板101 At this time, the relationship between the incident angle θ1 and an exit angle θ2, when the refractive index of the light guide plate and the refractive index of air is 1 and the n2, sinθ1 × 1 = sinθ2 × n2 ····· according to Snell's theorem (1) There are relationships, the light guide plate 101 made of plastic material or the like
の屈折率n2は例えば1.53であり、空気の屈折率1 Is the refractive index n2 of example 1.53, the refractive index 1 of air
より大であるから、(1)式より出射角θ2は入射角θ Because it is larger, (1) the incident angle exit angle θ2 is from the equation θ
1よりも小となる。 It becomes smaller than 1. ここで、出射角θ2は導光板101 Here, the exit angle θ2 indicates a light guide plate 101
の屈折率n2で決まる臨界角θc例えば39?(入射角θ1=90?の場合の出射角θ2に相当)を超えることはない。 The critical angle θc for example 39 determined by the refractive index n2? Does not exceed (corresponding to the angle of incidence .theta.1 = 90? Exit angle θ2 in the case of). 本例の場合、LED102の指向性、導光板との隙間等のため、図6(a)に示すようにLED102 In this example, because such a gap between LED102 directional, light guide plate, as shown in FIG. 6 (a) LED102
から入光側面101cに対する実質的な入射光s1の入射の領域はLED102に対向する部分の近傍の部分となり、入射角θ1の最大値は90?よりも若干小さくなる。 Region of incidence of the substantial incident light s1 against incident side 101c from become part of the vicinity of a portion facing the LED 102, the maximum value of the incident angle θ1 is slightly smaller than 90?. よって出射光の出射角θ2は臨界角θcより小さい値の範囲に制限される。 Therefore the emission angle θ2 of the outgoing light is limited to a range of the critical angle θc smaller value. このようにして、導光板101 In this way, the light guide plate 101
内部における光の伝播のルートは側面101cの近傍においては、側面101cのうちLED102に対向部の近傍の部分から臨界角θcより小さい角度で扇状に開いた扇形部分G内に限られてしまう。 Route of light propagation inside in the vicinity of the side surface 101c, is limited from the portion in the vicinity of the facing portion to LED102 of the side surfaces 101c to the critical angle θc smaller angles in the sectors in G opened in a fan shape. よって図6(a)に示すように、導光板101の側面101cの近傍には、 Accordingly, as shown in FIG. 6 (a), in the vicinity of the side surface 101c of the light guide plate 101,
前記扇形部分Gに隣接して光の伝播ルートが存在しない三角形状の広い空白部分Hを生ずる。 The adjacent sector parts G produces a wide blank portion H of triangular propagation route does not exist in the light. そして、この空白部分Hにおいては、底面101aにおけるシボ等はあるが、直接の照明光(105)の出射はなく、前記扇形部分Gからの回り込みこみにより生じた2次的な出射光が照明光となる。 Then, in this blank portion H, albeit grain or the like in the bottom 101a, no emission of direct illumination light (105), the secondary emitted light produced by the crowded sneak from the sectors G illumination light to become. 従って空白部分の照明光の輝度は扇形部分の照明光の輝度よりも大幅に低下し照明光の輝度の不均一を生ずる。 Therefore the luminance of the illumination light blank portion than the luminance of the illumination light of the sector portion is greatly reduced resulting in unevenness in the luminance of the illumination light.

【0008】このように、従来のエッジライト方式の面状光源に使用する導光板においては、導光板より出射する照明光の明るさを上げるために、LED等の発光源を導光板に極力近接させると、上記のような照明光の輝度の不均一の問題を生ずる。 [0008] Thus, in the light guide plate used in the surface light source of a conventional edge light type, in order to increase the brightness of the illumination light emitted from the light guide plate, as close as possible to the light emitting source such as an LED to the light guide plate If it is, causing luminance non-uniformity problems of the above-described illumination light. 本発明はかかる問題を改善することを課題とするものである。 The present invention is directed to an object to improve such problems. すなわち、本発明は、 That is, the present invention is,
LED等の発光源を導光板に極力近接させた状態で、照明光の輝度を十分に均一とすることのできる面状光源の導光板を提供すること目的とする。 In a state where the light emitting source as much as possible as close to the light guide plate such as an LED, an object is to provide a light guide plate of the planar light source which can be a sufficiently uniform luminance of illumination light.

【0009】 [0009]

【課題を解決するための手段】上記の課題を解決するためにその第1の手段として本発明は、板状の透光材よりなり、その側面に対向して配された発光光源からの光を光路変換してその主面からから照明対象物に対し面状の照明光を出射する導光板において、前記発光光源と対向する導光板の側面に、凹凸を設けたことを特徴とする。 The present invention as the first means for solving the above problems BRIEF SUMMARY OF THE INVENTION is made of a plate-shaped transmissive material, the light from the light emitting source disposed in facing relation to the side surface the by optical path conversion in the light guide plate for emitting planar illumination light to illuminate an object from the main surface thereof, the side surface of the light guide plate facing the light emission source, characterized in that a concavo-convex.

【0010】上記の課題を解決するためにその第2の手段として本発明は、前記第1の手段において、前記導光板の側面に設けた凹凸は複数の均一なプリズムよりなることを特徴とする。 [0010] The present invention as the second means in order to solve the above problems, in the first means, unevenness provided on a side surface of the light guide plate is characterized by comprising a plurality of uniform prisms .

【0011】上記の課題を解決するためにその第3の手段として本発明は、前記第2の手段において、前記プリズムは導光板の厚み方向又はこれと斜交する方向に伸びていることを特徴とする。 [0011] wherein the present invention as a third means to solve the aforementioned problem, in the second means, wherein said prism extends in the thickness direction or its oblique direction of the light guide plate to.

【0012】上記の課題を解決するためにその第4の手段として本発明は、前記第1の手段において、前記導光板の側面に設けた凹凸は導光板の厚み方向又はこれと斜交する方向に伸びている断面が円弧状の複数の溝または突起であることを特徴とする。 [0012] The present invention as the fourth means for solving the aforementioned problem, the first in one unit, irregularities provided on a side surface of the light guide plate thickness direction or its oblique direction of the light guide plate wherein the is has a cross section extending in an arc shape of a plurality of grooves or projections.

【0013】上記の課題を解決するためにその第5の手段として本発明は、前記第1の手段において、前記導光板の側面に設けた凹凸は均一又は不均一なシボであることを特徴とする。 The present invention as the fifth means for solving the aforementioned problem, in the first means, unevenness provided on a side surface of the light guide plate and characterized by a uniform or non-uniform grain to.

【0014】上記の課題を解決するためにその第6の手段として本発明は、前記第1の手段乃至第5の手段のいずれかにおいて、前記発光光源と導光板との距離は導光板の厚さの(1/2)以下であることを特徴とする。 The present invention as the sixth means for solving the above problems is characterized in, in one of the first means to the fifth means, the distance between the light emitting source and the light guide plate has a thickness of the light guide plate and characterized in that the the (1/2) or less.

【0015】上記の課題を解決するためにその第7の手段として本発明は、前記第1の手段乃至第6の手段のいずれかにおいて、前記発光光源は1個又は複数個のLE The present invention as the seventh means for solving the above problems is characterized in, in one of the first means or the sixth means, wherein the light emitting source is one or more of LE
Dよりなることを特徴とする。 Characterized by comprising from D.

【0016】上記の課題を解決するためにその第8の手段として本発明は、前記第7の手段において、前記複数個のLEDには発光色の異なるLEDが含まれることを特徴とする。 [0016] The present invention as the eighth means for solving the aforementioned problem, in the seventh means, said a plurality of LED, characterized in that contain different LED emission colors.

【0017】 [0017]

【発明の実施の形態】以下に、図面に基づいて本発明の第1の実施の形態に係る面状光源について説明する。 BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the planar light source will be described according to the first embodiment of the present invention with reference to the accompanying drawings. 図1は本実施の形態に係る導光板を用いたエッジライト方式の面状光源の構成を示す図であり、(a)は上面図、 Figure 1 is a diagram showing a configuration of a planar light source of the edge light method using the light guide plate according to the present embodiment, (a) shows the top view,
(b)は(a)のA−A断面図である。 (B) is an A-A sectional view of (a). 図1において、 In Figure 1,
10は面状光源であり、導光板1と発光源として3個のLED2を有している。 10 is a planar light source, a three LED2 are light guide plate 1 and the light emitting source. 導光板1は透光性を有するプラスチック材等よりなり、板状で略直方体形状をしており、その一方の主面である上面1bは鏡面仕上げがなされ光出射面となっている。 The light guide plate 1 is made of plastic material or the like having a light transmitting property has a substantially rectangular parallelepiped plate-like, upper surface 1b is a major surface of one of which has a light emission surface is made mirror-finished. 上面1bと対向する下面1a Top 1b opposite to the lower surface 1a
には、発光源であるLED2から導光板1内に入った光を前記上面1bに向けて反射させるための手段として、 , The light entering the light-emitting source LED2 from the light guide plate 1 is as a means for reflecting toward the top surface 1b,
その表面に複数の微小なシボ又は複数個の半球状ドット等が設けられ、下面1aは光反射面となっている。 A plurality of fine grain or a plurality of hemispherical dots or the like is provided on the surface, the lower surface 1a has a light reflecting surface. 7は液晶パネルであり、導光板1の上面1bと対向する位置に配置されている。 7 is a liquid crystal panel, is disposed on the upper surface 1b opposite to the position of the light guide plate 1.

【0018】1c、1d、1e、1fは導光板1の4つの側面であり、入光側面1cに対向してはLED2が配置されている。 [0018] 1c, 1d, 1e, 1f is the four side surfaces of the light guide plate 1, is to face the light incident side surface 1c are arranged LED2. 3個のLEDが側面1cとの距離dが極めて短くなる位置にLED基板3に支持されて配設されており、前記距離dは、導光板の厚さをtとしたとき、 Three LED is disposed is supported by the LED board 3 at a distance d is very short position with the side surface 1c, the distance d when the thickness of the light guide plate was t,
d<(t/2)となっている。 d <has become a (t / 2). 図1に示す例においてはd=t/4 程度となっている。 And has a d = t / 4 about in the example shown in FIG. このような近接配置としたのは、導光板1から出射する照明光の明るさを上げるためであり、このためには、LED102と導光板1 To that such a close arrangement is for increasing the brightness of the illumination light emitted from the light guide plate 1, for this purpose, LED 102 and the light guide plate 1
01の距離(d)を極力小さくすることが望ましい。 It is desirable that the 01 distance (d) is as small as possible. 距離を小さくするほどLEDに対する導光板1の立体角が増え、導光板1に入射するLED2の光束が増えるからである。 Distance solid angle of the light guide plate 1 to the LED is increased the smaller is because LED2 of the light beam incident on the light guide plate 1 is increased.

【0019】図2は図1のB部の拡大図であり、(a) [0019] Figure 2 is an enlarged view of a B portion of FIG. 1, (a)
は上面図、(b)は入光側面1cの斜視図である。 It is a top view, (b) is a perspective view of a light incident side surface 1c. 図2 Figure 2
に示すように、導光板1の入光側面1cには導光板の厚み方向に走る複数のプリズム状の凸部1c1が均一に分布して凹凸が形成されている。 As shown in, the light incident side surface 1c of the light guide plate 1 irregularities plurality of prismatic protrusions 1c1 are uniformly distributed running in the thickness direction of the light guide plate is formed. ここで、凸部1c1と凸部1c1の間は導光板1の厚味方向に略並行な複数の尺状の平面部1c2となっている。 Here, between the protrusions 1c1 and the convex portion 1c1 has a substantially parallel plurality of elongated flat portion 1c2 in the thickness direction of the light guide plate 1. 側面1cのこれら凹凸1c1、1c2の表面は鏡面仕上げとなっている。 The surface of these irregularities 1c1,1c2 side 1c has become a mirror finish. 図1 Figure 1
に示す導光板1の他の側面1d、1e、1fはそれぞれ、上面1bに略垂直な凹凸のない平面よりなり、それらの表面は鏡面仕上げされている。 Each other aspects 1d, 1e, 1f the light guide plate 1 shown in consists substantially vertical without unevenness plane on the upper surface 1b, their surfaces are mirror-finished.

【0020】上記の構成において、図示しない駆動回路よりLED2に所定の電流が供給されるとLED2は所定の色、例えば略白色の光を発光、出射する。 [0020] In the above configuration, LED2 when a predetermined current is supplied to the LED2 from the drive circuit (not shown) a predetermined color, for example, emit substantially white light, it is emitted. LEDからの出射光は前記入光側面1cから導光板1に入り、図1(b)に示すように(大部分の光は)上面である光出射面1bで全反射、下面である光反射面1aでは全反射又は乱反射を繰り返しながら、後述の図3にも示すように、側面1d又はf、又はeに向かって進行し、一部がこれらの側面で反射される等して、その進行の経路が広く導光板内に伝播される。 Light emitted from the LED enters from the light incident side surface 1c to the light guide plate 1, (most of the light) as shown in FIG. 1 (b) total reflection on the light exit surface 1b is a top, light reflection is a bottom while repeating total reflection or irregular reflection in the surface 1a, as shown in FIG. 3 described later, and proceeds toward the side surface 1d or f, or e, and the like part is reflected in these aspects, the progressive path is propagated widely the light guide plate. このような伝播の際、導光板1の下面1aである光反射面に設けられた多数のドット状窪み又は半球状ドット等よりなるシボにより反射又は屈折した光が導光板の上面1bである光出射面から照明光15として外部に出射する。 During such propagation, light light reflected or refracted by a number of dot-like depressions or grain consisting hemispherical dots or the like provided on the light reflecting surface is a bottom 1a of the light guide plate 1 is a top 1b of the light guide plate emitted to the outside as illumination light 15 from the exit surface. 外部に出射した照明光1 Illumination light emitted to the outside 1
5は図1(b)に示すように液晶パネル7を背後から照明する。 5 illuminates the liquid crystal panel 7 from behind, as shown in FIG. 1 (b).

【0021】上記の照明の際、LEDから出射した光の大部分は導光板1の側面1cに達する。 [0021] During the illumination, most of the light emitted from the LED reaches the side surface 1c of the light guide plate 1. これは、上記のように、LED2と側面1cの距離dは極力小さくなっているので、前記出射光は十分広い立体角の範囲で側面1cに達するからである。 This is because, as described above, the distance d LED2 and the side surface 1c so becomes as small as possible, the emitted light because to reach the side surface 1c in the range of sufficiently wide solid angle. 本実施の形態における導光板1の材料は例えばポリカーボネイトありこの場合、屈折率は 1.53 であり、臨界角θcは略 θc=39 When the material of the light guide plate 1 in the present embodiment, there are for example polycarbonate this, the refractive index is 1.53, the critical angle .theta.c is substantially .theta.c = 39
?である。 ? A. 図2に示すように、側面1cに達した光線のうち、平面部1c2に対し入射する光線s1についての挙動は、すでに図6を用いて説明した従来の導光板の場合と略同様であり、説明を省略する。 As shown in FIG. 2, among the light rays reaching the side surface 1c, the behavior of the light rays s1 incident the plane portion 1c2 is approximately similar to the case of the conventional light guide plate as described previously using FIG. 6, description thereof will be omitted. 次に入光側面1c Then the light incident side 1c
の凸部1c1に入射する光線s2の挙動について説明する前に、入射角θ1の変化に伴う出射角θ2の変化の傾向につき一般的な説明をする。 Before describing the behavior of light rays s2 incident on the convex portion 1c1 of the general explained tendency of change in the output angle θ2 due to the change of the incident angle .theta.1. 空気中から本例の導光板のように屈折率が1より高い部材に対し光の入射がなされた場合、入射角θ1が小さいものについて出射角θ2 When the incident light refractive index with respect to higher than 1 member as the light guide plate of the present example from the air is made, exit angle θ2 about what the angle of incidence θ1 is small
との差である屈折の曲がり Δθ=θ1―θ2 は小さく、出射光は入射光の延長に近い方向にある。 Bends Δθ = θ1-θ2 of refraction which is the difference between the small and the emitted light is in the direction close to the extension of the incident light. 一方、入射角θ1が大きくなると屈折の曲がりである前記のΔθ On the other hand, said Δθ which is bending of refraction and the incident angle θ1 is increased
は大きくなり、出射光は入射光の延長から内側に向けて大きく傾斜した角度をとる。 Becomes large, the outgoing light taking large oblique angle toward the inside from the extension of the incident light. この理由は(1)式に示したスネルの原理により説明できる。 The reason can be explained by the principle of Snell shown in equation (1). すなわち、(1)式によれば、入射角θ1が90?のときは曲がりの角度 That is, according to (1), the angle of the bend when the incident angle θ1 is 90? Of
Δθ=θ1―θ2 は 90?―θc(臨界角)となり例えば略 Δθ=50?となるが、入射角θ1が減少すると、曲がりの角度Δθも減少し、入射角θ1が0?に近づけば曲がりの角度Δθも0?に近づく。 Δθ = θ1-θ2 is 90? -θc (critical angle) and will for example be approximately [Delta] [theta] = 50?, The incident angle .theta.1 is reduced, also reduces the angle [Delta] [theta] of the bend, bend it closer to the angle of incidence .theta.1 is 0? also of the angle Δθ closer to 0?.

【0022】ここで、入光側面1cの凸部1c1のプリズム面に入射したs2光線については、その面の傾斜角αの効果により、従来よりも出射角θ2を効果的に増大することができる。 [0022] Here, for s2 light beam incident on the prism surface of the projection 1c1 light entrance side 1c, may be due to the effect of the inclination angle α of the surface, increasing the output angle θ2 effectively than conventional . この理由は、入射光s2の入射角について前記平面部1c2を基準とした入射角θ1が比較的大であっても、前記プリズム面における実際の入射角θ1eは θ1e=θ1―α となり、θ1よりもかなり減少するので、上記した原理により、曲がりの角度Δ This is because, even at relatively large incident angle .theta.1 relative to the said plane portion 1c2 for the angle of incidence of the incident light s2, the actual angle of incidence Shita1e in the prism surface θ1e = θ1-α, and the more .theta.1 since also significantly reduced by the principle described above, the angle of the bend Δ
θも減少し、出射光の方向は入射光s2の延長に近い方向となるからである。 Also reduced theta, the direction of emitted light because a direction close to the extension of the incident light s2. よって、前記プリズム面の傾斜角αを適切に設定すれば、平面部1c2の面を基準とした出射角θ2を臨界角θcを超える範囲にまで十分に増大させることができる。 Therefore, by appropriately setting the inclination angle α of the prism surface can be increased sufficiently the output angle θ2 relative to the plane of the planar portion 1c2 to a range exceeding the critical angle .theta.c. 以上を要約すれば、本実施の形態においては、入光側面1c設けたプリズム状の凸部1c In summary of the above, in this embodiment, prism-shaped protrusions 1c provided incident side 1c
1におけるプリズム面の傾斜の効果により、入光側面1 The effect of the inclined prism surface in 1, light incident side 1
cに入射する入射角θ1が大きい光線に対しても出射角θ2を従来よりも増大させ、結果として入光側面1c全体に関し、導光板1内部への出射光の角度範囲を従来よりも大幅に増大させることができる。 Also increases the output angle θ2 than conventional to light rays incident angle θ1 is larger incident on c, relates entire light incident side surface 1c as a result, the angular range of light emitted to the light guide plate 1 inside significantly than the conventional it can be increased. なお、プリズム状の凸部1c1から内部に入射した光線は、入射面であるプリズムの面が導光板1の厚味方向に略並行に伸びているので、屈折により上下に分散して、ただちに導光板1 Incidentally, light beam incident on the inside of the prism-shaped protrusions 1c1, since the surface of the prism is incident surface extending substantially parallel to the thickness direction of the light guide plate 1, and dispersed vertically by refraction, immediately guide light plate 1
外に出てしまうことは少なく、導光板1内を広く伝播した状態で照明光に変換される。 It is rare that travel outside, is converted into illumination light while widely propagated in the light guide plate 1. このような効果はプリズム面が導光板の厚味方向に斜交している場合でも得られることがある。 Such effect is sometimes prism surface can be obtained even if the obliquely intersects the thickness direction of the light guide plate.

【0023】図3は本第1の実施の形態における導光板1の内部の光伝播路の分布状態を示す上面図である。 [0023] FIG. 3 is a top view showing the distribution of light propagation path of the light guide plate 1 in the first embodiment the present. 入射光は実質的には図6に示す従来の面状光源と同様にL Incident light as in the conventional surface light source is substantially as shown in FIG. 6 L
EDの対向部の近傍の範囲において導光板1に入射するので、光伝播路11sの出発する際の領域の幅は従来と同様であるが、光伝播路11sの出発の際の方向は、上記した原理により、その角度範囲が臨界角θcを超えて従来よりもかなり広い角度範囲にとなっている。 Is incident on the light guide plate 1 in a range in the vicinity of the facing portion of the ED, the width of the area when the starting of the light propagation path 11s is the same as the conventional, the direction at the time of starting the light propagation path 11s is the by the principle that the angular range is in the fairly wide range of angles than the conventional above the critical angle .theta.c. よって、側面1c近傍の光伝播路11sの存在領域G1は従来よりも広がっている。 Therefore, the existence region G1 of the light propagation path 11s near side 1c is wider than the prior art. 存在領域G1の側方には光伝播路11sが存在せず、直接には照明光(15)が出射しない空白領域H1があるが、図6に示す従来の導光板の場合よりも、存在領域が広がった分だけ空白領域は大幅に縮小している。 On the side of the existing area G1 is absent light propagation path 11s, but directly is blank region H1 where the illumination light (15) is not emitted, than in conventional light guide plate shown in FIG. 6, the existence region blank area only has spread minute has been greatly reduced. なお、空白領域H1においてもその底面にはシボがあり、存在領域G1の底面のシボによる光の散乱に起因する2次的な回り込みを受けて、空白領域H1においても、その底面のシボの作用で間接的には照明光を出射する。 Note that there is grain is also on its bottom surface in the blank area H1, receives by grain of the bottom of the existing region G1 sneak a secondary due to scattering of light, even in the blank area H1, the action of the grain of the bottom surface in the indirect emits illumination light. ただし、従来のように空白領域が広いと、その中央部を含む大部分で大幅に輝度が低下し、輝度の顕著な不均一をもたらしていた。 However, when the blank area as in the prior art is wide, greatly reduces the luminance in a large portion including the central portion, it has resulted in significant non-uniformity of brightness. しかしながら、本実施の形態においては、空白領域H1の広さは従来よりも十分に狭く、回りこみによる照明光の輝度は存在領域G1の輝度に比してあまり低下していない。 However, in this embodiment, the width of the blank area H1 is sufficiently narrower than the conventional, not much reduced luminance of the illumination light by wraparound than the luminance of the existence region G1. よって、導光板1の入光側面1cの近傍においても、照明光15の輝度は実質的に均一となる。 Therefore, even in the vicinity of the light incident side surface 1c of the light guide plate 1, the luminance of the illumination light 15 becomes substantially uniform.

【0024】従って、本第1の実施の形態によれば、照明光を明るくするために、LEDを導光板の側面に極めて近接して配置した場合、導光板から出射する照明光の輝度の均一性を従来よりも効果的に高めることができる。 [0024] Therefore, according to the first embodiment, in order to brighten the illumination light, when placed in close proximity to LED on the side of the light guide plate, uniform brightness of the illumination light emitted from the light guide plate sex and can be effectively enhanced than before. これにより、照明されるパネルの表示品質を高めることができる。 This can increase the display quality of the illuminated panels. なお、本第1の実施の形態においては、発光源として複数個のLEDを用いたが、本発明はこれに限らず、導光板の形状によっては1個のLEDのみを用いた場合でも、同様の効果が得られる。 Incidentally, in the present first embodiment, even when it is used a plurality of LED as a light emitting source, the present invention is not limited to this, depending on the shape of the light guide plate using only one LED, similar effect can be obtained. また、複数個のLEDの発光色は同一色に限らず、R、G、B等異なった発光色のものであっても、混色による照明光の輝度の均一性が従来よりも向上する。 Also, emission color of the plurality of LED is not limited to the same color, R, G, even those such as different emission colors B, the uniformity of luminance of illumination light by color mixing can be improved than before.

【0025】以下に、図面に基づいて本発明の第2の実施の形態に係る導光板について説明する。 [0025] Hereinafter, the light guide plate according to a second embodiment of the present invention will be described with reference to the drawings. 図4は本第2 Figure 4 is the second
の実施の形態に係る導光板を用いたエッジライト方式の面状光源の入光側面の近傍の構成を示す部分的拡大図であり、(a)は上面図、(b)は入光側面の斜視図である。 Of a partial enlarged view showing the configuration of a vicinity of the light incident side of the surface light source of the edge light method using the light guide plate according to the embodiment, (a) shows the top view, (b) is the incident side surface it is a perspective view. なお、本第2の実施の形態に係る面状光源全体の構成および部材の記号は、前記光入射側面を除き図1に示した面状光源の場合と同様である。 The symbol of the second embodiment of the surface light source the overall configuration and components of the embodiment are similar to those of the planar light source shown in FIG. 1 except the light incident side. 図4に示すように導光板1の入光側面1cには導光板の厚み方向に伸びる断面が円弧状の複数の溝1c3が略均一に分布して設けられている。 Section extending in the thickness direction of the light guide plate is provided to be substantially uniformly distributed plurality of arc-shaped grooves 1c3 to the light incident side surface 1c of the light guide plate 1 as shown in FIG. 溝1c3と溝1c3の間は平面部1c4となっている。 Between the grooves 1c3 and the groove 1c3 has a flat portion 1C4.

【0026】図4(a)に示すように、LED2から入光側面1cに達した光のうち、溝1c3の底部および、 As shown in FIG. 4 (a), of the light reaching the light incident side surface 1c from the LED2, the bottom of the groove 1c3 and,
平面部1c4を透過、屈折するものの挙動は図6に示す従来例で説明した入射光の同様であり説明を省略する。 Transmitting the flat portion 1C4, the behavior of which refractive is the same incident light described in the conventional example shown in FIG. 6 omitted.
溝1c3の側部に入射する光線に関しては入射面の傾斜の効果により、すでに第1の実施形態において説明したのと基本的には同様の原理により、平面部1c4を基準とした見た出射角の角度範囲を臨界角を超えて従来よりも大幅に広げることができる。 By the effect of the inclination of the incident plane with respect to light beams incident on the side of the groove 1c3, the already same principles of the basically described in the first embodiment, the emission angle as viewed relative to the flat portion 1c4 it is possible to widen the angular range significantly than conventionally above the critical angle. なお、溝1c3から導光板1の内部に出射した光線は、入射面である溝の面が導光板の厚味方向に略並行となっているので、ただちに屈折により、上下に散乱して導光板1外に出てしまうことは少なく、導光板1内を広く伝播した状態で照明光に変換される。 Note that light rays emitted inside the groove 1c3 of the light guide plate 1, since the surface of the groove is an incident surface are substantially parallel to the thickness direction of the light guide plate immediately refraction by, scattered by the light guide plate in the vertical it is rare that would appear to 1 out, is converted into illumination light while widely propagated in the light guide plate 1. このようにして、本第3の実施の形態においても、図1に示した第1の実施の形態の場合と同様に、 In this manner, the present also in the third embodiment, as in the first embodiment shown in FIG. 1,
入光側面1cの近傍の導光板1内の光伝播路の存在領域(G1)を従来よりも大幅に広げ、光伝播路が存在しない空白領域(H1)を従来よりも縮小することができる。 Spread existing area of ​​the optical propagation path in the light guide plate 1 in the vicinity of the light incident side surface 1c (G1) to a greater extent than conventional blank area where light propagation path does not exist (H1) can be reduced than conventionally. よって、本第2の実施の形態も、すでに説明した第1の実施の形態と同様の効果を有する。 Therefore, the second embodiment also has the same effect as the first embodiment already described.

【0027】なお、図示は省略するが、本第2の実施の形態の変形例として、断面円弧状で、導光板の厚味方向に伸びるカマボコ状の複数の凸部を有するものがある。 [0027] Although not shown, as a modification of the second embodiment, in cross section arcuate, those having a semicylindrical shape of a plurality of protrusions extending in thickness direction of the light guide plate.
この場合もカマボコ状の凸部において、広い角度範囲において入射光を透過させ、第2の実施の形態と同様の効果を得ることができる。 In semicylindrical convex portion In this case, it is possible to not transmit incident light, the same effect as the second embodiment in a wide angular range.

【0028】以下に、図面に基づいて本発明の第3の実施の形態に係る導光板について説明する。 [0028] Hereinafter, the third light guide plate according to an embodiment of the present invention will be described with reference to the drawings. 本第3の実施の形態は導光板1の入光側面に各種のシボ等の凹凸を設けた例に関するものである。 The third embodiment relates to an example having irregularities of various or the like grain on the light incident side of the light guide plate 1. 図5は第3の実施の形態に各種のシボ等の形状を示す入光側面1cの部分的な拡大斜視図であり、(a)は多数の微小な半球の窪み21を有するシボを示す図、(b)は多数の微小な半球状の凸部22を有するシボを示す図、(c)は多数の微小な角錐状の窪み23を有するシボを示す図、(d)は多数の微小な円錐状の凸部24を有するシボを示す図、(e) Figure 5 is a partial enlarged perspective view of a light incident side 1c showing the shape of various grain like the third embodiment, (a) shows the diagram showing a grain having a recess 21 of a large number of fine hemispherical , (b) is a diagram showing a grain having a large number of fine hemispherical convex portion 22, (c) is a diagram showing a grain having a large number of fine pyramid-shaped recesses 23, (d) the large number of small shows a grain having a conical protrusion 24, (e)
は多数の微小な角錐状の凸部25を有するシボを示す図である。 Is a diagram illustrating a grain having a large number of fine pyramid-shaped convex portion 25. (f)はシボとは言えないが、後述するヘアライン状の凹凸26を示す図である。 (F) is not said to be embossed is a diagram showing a hairline-like irregularities 26 described later. なお、本第3の実施の形態に係る導光板を用いた面状光源全体の構成は、前記光入射側面を除き図1に示した面状光源の場合と同様である。 Incidentally, planar light source the overall configuration using the light guide plate according to the third embodiment is similar to the case of the surface light source shown in FIG. 1 except the light incident side.

【0029】これらのシボにおいて、半球状の窪み2 [0029] In these grain, semi-spherical recess 2
1、は角錐状の窪み23に達した入射光はその窪みの内面の入射面の傾斜効果により、すでに説明したのと同様の原理で、導光板1内部への出射光の出射角を大とすることができる。 1, by tilting effect of the incident light reaching the pyramidal depressions 23 are incident surface of the inner surface of the recess that already on the same principle as described, the emission angle of light emitted to the light guide plate 1 inside Daito can do. また、半球状の凸部22、円錐状の凸部24、角錐状の凸部25に達した入射光についても入射面の傾斜効果により同様の傾向がある。 Further, the convex portion 22 of the hemispherical, conical protrusions 24, there is a similar tendency by the inclination effect of the incident surface for the incident light reaching the pyramidal protrusions 25. このようにして、かかるシボ加工がなされた入光側面1cに達した光の屈折による導光板内部への出射の出射光については、 In this way, the light emitted according graining is emitted to the inside of the light guide plate due to refraction of light reaching the light incident side surface 1c which is made,
全体として見た場合、従来は臨界角以下に制限されていた出射光の角度範囲をこれよりも大幅に広げることが可能となる。 When viewed as a whole, the prior art makes it possible to widen considerably the angular range of the emitted light are limited to the critical angle than this. よって、すでに説明したのと同様の原理により、従来よりも導光板から出射する照明光の輝度の均一化を改善することができる。 Thus, already the same principle as described, it is possible to improve the uniformity of luminance of illumination light emitted from the light guide plate than conventionally.

【0030】なお、シボの形状としてはこの他に図示は省略するが、多数の円錐状の窪みよりなるものがある。 [0030] Incidentally, the shape of the grain is not shown In addition, there is composed of a number of conical depressions.
これまで述べてきた入光側面1cのシボの形状に関しては、図5(a)、(b)、(c)、(d)、(e)に示すように、同一の寸法の凸部又は窪みが均一に配列されているものであったが、本発明に係るシボの形状はこれに限らず、不均一な寸法の凸部又は窪みが不規則に配列されている場合においても前記のシボと同様の効果を有する。 In this regard until said getting shape of grain in the incident side surface 1c has, FIG 5 (a), (b), (c), (d), (e), the protrusion of the same size or recesses Although were those are uniformly arranged, the shape of the grain according to the present invention is not limited thereto, and the said grain even when the projection or recess of non-uniform sizes are randomly arranged It has the same effect.

【0031】次に図5(f)はシボとはいえないが、入光側面1cに設けられたヘアライン形状の不規則な凹部26(又は凸部であってもよい。)を示す斜視図である。 [0031] Next Although FIG 5 (f) is not a grain, irregular recess 26 of hairline shape provided on the light incident side surface 1c (a or protrusions may be.) A perspective view showing an is there. かかるヘアライン形状の凹部(又は凸部)26を有する入光側面1cも前記のシボを有する入光側面1cと基本的には同様の原理により同様の作用をなし、導光板に対し略同様の改善効果を与える。 No similar effects by similar principles to light incident side surface 1c basically incident side 1c also having said grain having recesses (or projections) 26 of such a hairline shape, substantially the same improvement with respect to the light guide plate give the effect.

【0032】 [0032]

【発明の効果】以上に説明したように、本発明によれば、エッジライト方式の面状光源において、導光板より出射する照明光の明るさを上げるために、LED等の発光源を導光板に極力近接させた場合においても、導光板から出射する照明光の輝度の均一性を従来よりも高めことが出来、これにより、照明されるパネルの表示品質を高めることができる。 As described above, according to the present invention, according to the present invention, in the surface light source of the edge light type, in order to increase the brightness of the illumination light emitted from the light guide plate, the light emitting source through the light guide plate such as an LED even when allowed to as close as possible to, the uniformity of luminance of illumination light emitted from the light guide plate can be higher than conventional, thereby, it is possible to improve the display quality of the illuminated panels.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の第1の実施の形態に係る導光板を用いた面状光源の構成を示す図である。 1 is a diagram showing the construction of a planar light source using the light guide plate according to a first embodiment of the present invention.

【図2】図1におけるB部の拡大図である。 Is an enlarged view of a portion B in FIG. 1;

【図3】図1に示す面状光源に用いる導光板の内部の光伝播路の分布状態を示す上面図である。 3 is a top view showing the inside of the distribution of light propagation path of the light guide plate used in the planar light source shown in FIG.

【図4】本発明の第2の実施の形態に係る導光板の入光側面の形状を示す図である。 4 is a diagram showing the shape of the light incident side surface of the light guide plate according to a second embodiment of the present invention.

【図5】本発明の第3の実施の形態に係る導光板の入光側面の形状を示す図である。 5 is a third diagram showing the shape of the light incident side surface of the light guide plate according to an embodiment of the present invention.

【図6】従来の導光板を用いた面状光源の構成を示す図である。 6 is a diagram showing the construction of a planar light source using the conventional light guide plate.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 導光板 1c 入光側面 1c1 プリズム状凸部 1c2、1c4 平面部 1c3 溝 2 LED 3 LED基板 7 液晶パネル 10 面状光源 11s 光伝播路 15 照明光 21、22、23,24、25 シボ 26 ヘアライン G1 存在領域 H1 空白領域 1 light guide plate 1c incident side 1c1 prismatic protrusions 1c2,1c4 flat portion 1c3 groove 2 LED 3 LED substrate 7 liquid crystal panel 10 planar light source 11s light propagation path 15 illumination 21-25 grain 26 hairline G1 existence region H1 blank area

Claims (8)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 板状の透光材よりなり、その側面に対向して配された発光光源からの光を光路変換してその主面から照明対象物に対し面状の照明光を出射する導光板において、前記発光光源と対向する導光板の側面に、凹凸を設けたことを特徴とする導光板。 1. A consists plate-shaped transmissive material, for emitting illumination light planar with respect to the optical path conversion to illuminate the object from the main surface of the light from the light emitting source disposed in facing relation to the side surface in the light guide plate, on the side surface of the light guide plate facing the light emission source, a light guide plate, characterized in that a concavo-convex.
  2. 【請求項2】 前記導光板の側面に設けた凹凸は複数の均一なプリズムよりなることを特徴とする請求項1に記載の導光板。 2. A light guide plate according to claim 1 irregularities provided on a side surface of the light guide plate is characterized by comprising a plurality of uniform prisms.
  3. 【請求項3】 前記プリズムは導光板の厚み方向又はこれと斜交する方向に伸びていることを特徴とする請求項2に記載の導光板。 Wherein said prism light guide plate according to claim 2, characterized in that extending in the thickness direction or its oblique direction of the light guide plate.
  4. 【請求項4】 前記導光板の側面に設けた凹凸は導光板の厚み方向又はこれと斜交する方向に伸びている断面が円弧状の複数の溝または突起であることを特徴とする請求項1に記載の導光板。 4. A claims, characterized in that unevenness is provided on a side surface of the light guide plate has a cross section extending in the thickness direction or its oblique direction of the light guide plate is a circular arc shape of a plurality of grooves or projections the light guide plate according to 1.
  5. 【請求項5】 前記導光板の側面に設けた凹凸は均一または不均一なシボであることを特徴とする請求項1に記載の導光板。 5. A light guide plate according to claim 1, characterized in that unevenness is provided on a side surface of the light guide plate is uniform or non-uniform grain.
  6. 【請求項6】 前記発光光源と導光板との距離は導光板の厚さの(1/2)以下であることを特徴とする請求項1乃至請求項5のいずれかに記載の導光板。 6. The light guide plate according to any one of claims 1 to 5, wherein the distance between the light emitting source and the light guide plate is less than the light guide plate thickness (1/2).
  7. 【請求項7】 前記発光光源は1個又は複数個のLED Wherein said light emitting source is one or a plurality of LED
    よりなることを特徴とする請求項1乃至請求項6のいずれかに記載の導光板。 The light guide plate according to any one of claims 1 to 6, characterized in that the more.
  8. 【請求項8】 前記複数個のLEDには発光色の異なるLEDが含まれることを特徴とする請求項7に記載の導光板。 8. The light guide plate according to claim 7, in the plurality of LED, characterized in that contain different LED emission colors.
JP2000393852A 2000-12-25 2000-12-25 Light guide plate Pending JP2002196151A (en)

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US7855827B2 (en) 2006-10-06 2010-12-21 Qualcomm Mems Technologies, Inc. Internal optical isolation structure for integrated front or back lighting
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