JPH08327807A - Surface light source device - Google Patents
Surface light source deviceInfo
- Publication number
- JPH08327807A JPH08327807A JP7155263A JP15526395A JPH08327807A JP H08327807 A JPH08327807 A JP H08327807A JP 7155263 A JP7155263 A JP 7155263A JP 15526395 A JP15526395 A JP 15526395A JP H08327807 A JPH08327807 A JP H08327807A
- Authority
- JP
- Japan
- Prior art keywords
- light
- reflector
- guide plate
- light source
- dots
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Optical Elements Other Than Lenses (AREA)
Abstract
Description
【0001】[0001]
【0001】[0001]
【0002】[0002]
【産業上の利用分野】本発明は、液晶表示装置などのバ
ックライトに用いる面状光源装置ならびにその製法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a planar light source device used for a backlight such as a liquid crystal display device and a method for manufacturing the same.
【0003】[0003]
【0002】[0002]
【0004】[0004]
【従来の技術】従来から、光源より出射した光を導光板
によつて表示板の表示部に導くバックライト照明の面状
光源装置としてはいろいろと提案されているが、その一
例として、図8〜図9に示すようなものが知られてい
る。すなわち、この面状光源装置は、ガラス、アクリル
樹脂、ポリカーボネイト樹脂などの透光性材料からな
り、その一側面端部が光入射部1とされた導光板2と、
この導光板2の光入射部1に近接して設けられた冷陰極
管などの筒状の光源3と、導光板2の表面に張り合わせ
た乳色半透明のポリエチレンテレフタレートフイルムな
どの散乱板4と、導光板2の裏面に設けられた光反射体
5と、この光反射体5に接して設けられた白色ポリエチ
レンテレフタレートフイルムからなる反射板6とから構
成されている。2. Description of the Related Art Conventionally, various types of planar light source devices for backlight illumination have been proposed in which light emitted from a light source is guided to a display section of a display plate by a light guide plate. ~ A thing as shown in Drawing 9 is known. That is, this planar light source device is made of a light-transmissive material such as glass, acrylic resin, or polycarbonate resin, and has a light guide plate 2 whose one side end is a light incident portion 1.
A cylindrical light source 3 such as a cold cathode tube provided in the vicinity of the light incident portion 1 of the light guide plate 2, and a scattering plate 4 such as a milk-color translucent polyethylene terephthalate film attached to the surface of the light guide plate 2. A light reflector 5 provided on the back surface of the light guide plate 2 and a reflector 6 made of white polyethylene terephthalate film provided in contact with the light reflector 5.
【0005】[0005]
【0003】光反射体5は、図9のように、多数の小径
から大径までの印刷ドット7を分散したもので形成され
てる(なお、以下の説明では、裏面の印刷ドット7全体
を示す時、これを光反射体5と称する)。導光板2の光
入射部1に近い部分には小径の印刷ドット7が配され
て、光入射部1から離れるにしたがって、径が順次大き
きくなる印刷ドット7が列状に配置されている。As shown in FIG. 9, the light reflector 5 is formed by dispersing a large number of small-sized to large-sized printed dots 7 (in the following description, the entire printed dots 7 on the back surface are shown. This is sometimes referred to as the light reflector 5). Small-diameter print dots 7 are arranged in a portion of the light guide plate 2 close to the light incident portion 1, and the print dots 7 are arranged in a row in which the diameter is gradually increased with increasing distance from the light incident portion 1.
【0006】[0006]
【0004】この導光板2の表面の多数の印刷ドット7
の形成は、透明ビビクルに酸化チタン、酸化亜鉛、酸化
カルシウム、酸化バリウム、硫酸バリウム等の光散乱性
微粉末を乳白色半透明の印刷インキを用い、スクリーン
印刷などの印刷法によつておこなわれる。A large number of printing dots 7 on the surface of the light guide plate 2.
The formation of is carried out by a printing method such as screen printing using a milk white translucent printing ink containing light scattering fine powder such as titanium oxide, zinc oxide, calcium oxide, barium oxide or barium sulfate in a transparent vehicle.
【0007】[0007]
【0005】このような光反射体5の印刷ドット7を設
けることによって、導光板2の光入射部1から入射した
光は、光入射部1から離れるにしたがつて大径の印刷ド
ット7によつて多く拡散されることになり、散乱板4の
全表面から均一な光量を放射する面状光源装置となる。By providing the printed dots 7 of the light reflector 5 as described above, the light incident from the light incident part 1 of the light guide plate 2 is converted into the large-sized printed dots 7 as the light is separated from the light incident part 1. Therefore, a large amount of light is diffused, and the surface light source device emits a uniform amount of light from the entire surface of the scattering plate 4.
【0008】[0008]
【0006】[0006]
【0009】[0009]
【発明が解決しようとする課題】上記の面状光源装置で
は、光反射体5の印刷ドット7の形成をスクリーン印刷
などの印刷法で行うため、ドット形成上に問題がおこ
る。80〜300μmまでの印刷を行うため目ズマリ、
ハミ出し等のトラブルが発生し精度を確保することが困
難である。また、このような印刷法では、印刷中にゴミ
などの異物が混入することがあり、光拡散の均一性がさ
またげられることになる。In the above-described planar light source device, since the print dots 7 of the light reflector 5 are formed by a printing method such as screen printing, there is a problem in dot formation. Since the printing is performed up to 80-300 μm,
It is difficult to secure accuracy due to problems such as peeling. Further, in such a printing method, foreign matter such as dust may be mixed in during printing, which impedes the uniformity of light diffusion.
【0010】[0010]
【0007】また、平面の均一な発光をさせるためには
印刷ドットの径の大小をどの様に配置するかにノウハウ
が必要となり、印刷ドットの分布を決めるための実験に
時間を必要とする。Further, knowing how to arrange the diameters of the printing dots in order to uniformly emit light on a plane requires know-how, and time is required for an experiment for determining the distribution of the printing dots.
【0011】[0011]
【0008】本発明は上記の点に鑑みてなされたもの
で、液晶表示装置などのバックライト照明に適用する面
状光源装置の導光板の構造ならびその製法に関するもの
であり、光源からの光を減衰させることなく均一に拡散
するための光拡散体の形状を高精度に再現することを目
的としている。The present invention has been made in view of the above points, and relates to a structure and a manufacturing method of a light guide plate of a planar light source device applied to backlight illumination of a liquid crystal display device or the like. The purpose is to accurately reproduce the shape of a light diffuser for uniform diffusion without attenuation.
【0012】[0012]
【0009】[0009]
【0013】[0013]
【課題を解決するための手段】請求項1記載の発明は、
透光性の材料よりなる導光板の少なくとも一側面端部を
光入射部とし、この導光板の一面に光反射が可能な光反
射体が設けられた面状光源装置において、前記光反射体
が円錐形ドットから構成されていることを特徴とする。According to the first aspect of the present invention,
In a planar light source device in which at least one side face end of a light guide plate made of a translucent material is used as a light incident part, and a light reflector capable of reflecting light is provided on one surface of the light guide plate, the light reflector is It is characterized by being composed of conical dots.
【0014】[0014]
【0010】請求項2記載の発明は、前記光反射体の円
錐形ドットの頂角の角度が80〜100°に構成されて
いることを特徴とする。The invention according to claim 2 is characterized in that the apex angle of the conical dots of the light reflector is set to 80 to 100 °.
【0015】請求項3の発明は、前記光反射体の円錐形
ドットの頂角の先端が球状に加工されていることを特徴
とする。The invention of claim 3 is characterized in that the tip of the apex angle of the conical dot of the light reflector is processed into a spherical shape.
【0016】請求項4の発明は、前記光反射体の円錐形
ドットが凸状に形成されていることを特徴とする。The invention of claim 4 is characterized in that the conical dots of the light reflector are formed in a convex shape.
【0017】請求項5の発明は、前記光反射体の円錐形
ドットが凹状に形成されていることを特徴とする。According to a fifth aspect of the present invention, the conical dots of the light reflector are formed in a concave shape.
【0018】請求項6の発明は、前記光反射体の円錐形
ドットが鏡面に形成されていることを特徴とする。The invention of claim 6 is characterized in that the conical dots of the light reflector are formed on a mirror surface.
【0019】請求項7の発明は、前記光反射体の円錐形
ドットが成型加工で形成されていることを特徴とする。The invention of claim 7 is characterized in that the conical dots of the light reflector are formed by molding.
【0020】請求項8の発明は、前記光反射体の円錐形
ドットが導光板と一体成型加工されていることを特徴と
する請求項1記載の面状光源装置。According to an eighth aspect of the present invention, the planar light source device according to the first aspect is characterized in that the conical dots of the light reflector are integrally formed with the light guide plate.
【0021】請求項9の発明は、前記光反射体の円錐形
ドットがレーザ加工されていることを特徴とする。According to a ninth aspect of the present invention, the conical dots of the light reflector are laser-processed.
【0022】請求項10の発明は、前記導光板の円錐形
ドットが形成された面と反対側面に溝を形成したことを
特徴とする。A tenth aspect of the present invention is characterized in that a groove is formed on a side surface of the light guide plate opposite to a surface on which the conical dots are formed.
【0023】[0023]
【0011】[0011]
【0024】[0024]
【作用】上記構成の面状光源装置では、導光板の一側面
より入射した光は円錐形状ドットで反射させ、各方向に
光を反射することにより、導光板全面に光を導き、散乱
板4の全表面から均一に光は放射され、面全体から均一
な光量の光を放射する。In the planar light source device having the above structure, the light incident from one side surface of the light guide plate is reflected by the conical dots, and the light is reflected in each direction to guide the light to the entire surface of the light guide plate, and the scattering plate 4 Light is radiated uniformly from all surfaces, and a uniform amount of light is radiated from the entire surface.
【0025】[0025]
【0012】[0012]
【0026】[0026]
【実施例】以下、本発明の実施例を図面により説明す
る。図1〜図5は本発明の第1実施例を示すもので、
又、図6〜図7は第2実施例を示すものである。共通部
は図8〜9の従来の実施例と同ー符号を付してある。Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention,
6 to 7 show the second embodiment. Common parts are designated by the same reference numerals as those of the conventional embodiment shown in FIGS.
【0027】[0027]
【0013】図1は第1実施例の面状光源装置の斜視
図、図2は側面図である。図3(a)は図1の導光板の
裏面の光反射体のパターンの例を示す斜視図である、図
3(b)は光反射体の凹状円錐形ドットの断面形状図で
ある。FIG. 1 is a perspective view of the surface light source device of the first embodiment, and FIG. 2 is a side view. FIG. 3A is a perspective view showing an example of a pattern of a light reflector on the back surface of the light guide plate of FIG. 1, and FIG. 3B is a sectional shape view of a concave conical dot of the light reflector.
【0028】図4(a)は本発明の原理を説明をする図
で、導光板による光反射の側面図、図4(b)は同じく
本発明の原理を説明をする図で、導光板の端部を分割し
た場合の光反射を説明する側面図である。図5(a)は
凹状円錐ドットでの光反射を示す平面図、図5(b)は
凹状円錐ドットでの光反射を示す側面図、図5(c)は
凹状円錐ドットでの光反射を示す斜視図である。FIG. 4A is a diagram for explaining the principle of the present invention, a side view of the light reflection by the light guide plate, and FIG. 4B is a diagram for explaining the principle of the present invention. It is a side view explaining the light reflection when an edge part is divided. 5 (a) is a plan view showing light reflection at a concave conical dot, FIG. 5 (b) is a side view showing light reflection at a concave conical dot, and FIG. 5 (c) is a side view showing light reflection at a concave conical dot. It is a perspective view shown.
【0029】図6(a)は第2実施例の導光板の表面に
溝を形成した時の斜面図、図6(b)は導光板の凹状円
錐ドットと溝を示す断面図である。図7(a)は導光板
表面の溝無し状態での光の反射の説明図、図7(b)は
溝部による光の屈折の説明図、図7(c)は溝部による
光の屈折の説明図であり溝部越に凹状円錐ドットを見た
図である。FIG. 6A is a perspective view of the light guide plate of the second embodiment when grooves are formed on the surface thereof, and FIG. 6B is a sectional view showing concave conical dots and grooves of the light guide plate. FIG. 7A is an explanatory diagram of light reflection in the state where there is no groove on the surface of the light guide plate, FIG. 7B is an explanatory diagram of light refraction by the groove portion, and FIG. 7C is an explanation diagram of light refraction by the groove portion. It is a figure and it is the figure which looked at the concave cone dot over a groove part.
【0030】[0030]
【0014】本発明の第1実施例を図面により説明す
る。本発明の面状光源装置は,図1〜2に示すように、
透光性材料からなり、その一側面の端部が光入射部1で
ある導光板2と、この導光板2の光入射部1に近接して
設けられた冷陰極管などの筒状の光源3と、導光板2の
裏面にに設けられた光反射体5すなわち多数の凹状円錐
ドット8と、この光反射体5に接して設けられて白色シ
ートなどからなる反射板6、導光板2の表面に接した散
乱板4から構成されている。なお、以下の説明では、導
光板2の裏面の円錐ドット8全体を示す時、これを光反
射体5と称する。A first embodiment of the present invention will be described with reference to the drawings. The surface light source device of the present invention, as shown in FIGS.
A light guide plate 2 made of a light-transmissive material and having an end on one side thereof serving as a light entrance part 1, and a cylindrical light source such as a cold cathode tube provided in the vicinity of the light entrance part 1 of the light guide plate 2. 3, the light reflector 5 provided on the back surface of the light guide plate 2, that is, a large number of concave conical dots 8, the reflector 6 formed in contact with the light reflector 5 and formed of a white sheet, and the light guide plate 2. The scattering plate 4 is in contact with the surface. In the following description, when the entire conical dot 8 on the back surface of the light guide plate 2 is shown, this is referred to as a light reflector 5.
【0031】[0031]
【0015】導光板2の材料にはガラス、アクリル樹
脂、ポリカーボネイト樹脂等の透光性材料が使われる。
この導光板2の裏面に設けられた光反射体5は、図3
(a)〜(b)に示すように多数の凹状円錐ドット8が
面全体に設けられたものからなり、列状に複数列に等間
隔に配置されている。このように凹状円錐ドット8を全
面に設けることによつて、導光板2の光入射部1から入
射した光は図5(a)〜(c)に矢印で示すように反射
され、各方向に光を放射することになり、散乱板4の全
表面から光が均一に放射され、面全体から均一な光量の
光を放射することになる。As the material of the light guide plate 2, a translucent material such as glass, acrylic resin or polycarbonate resin is used.
The light reflector 5 provided on the back surface of the light guide plate 2 is shown in FIG.
As shown in (a) and (b), a large number of concave conical dots 8 are provided on the entire surface and are arranged in a plurality of rows at regular intervals. By providing the concave conical dots 8 on the entire surface in this manner, the light incident from the light incident portion 1 of the light guide plate 2 is reflected as shown by the arrows in FIGS. Since light is emitted, the light is uniformly emitted from the entire surface of the scattering plate 4, and a uniform amount of light is emitted from the entire surface.
【0032】[0032]
【0016】図4(a)〜(b)は本発明の原理を説明
する図である。図4(a)に示すように光源より出た光
は導光板2の端部の45°にカットした場合はL巾方向
に100%反射される。図4(b)は端部45°の反射
面をk巾にn等分しW巾の範囲に等間隔に広げて配置す
ると反射光の巾LをWに一様に広げることが出来る。こ
の時の反射光量はk*n=Lとなる。4A and 4B are views for explaining the principle of the present invention. As shown in FIG. 4A, when the light emitted from the light source is cut at 45 ° at the end portion of the light guide plate 2, 100% is reflected in the L width direction. In FIG. 4B, if the reflecting surface at the end 45 ° is divided into n equal parts of k width and the parts are arranged at equal intervals in the range of W width, the width L of the reflected light can be evenly expanded to W. The amount of reflected light at this time is k * n = L.
【0033】[0033]
【0017】本発明はこの原理を利用したもので、この
全反射プリズムの45°反射面を分割し凹状円錐形ドッ
ト6の光反射体にした。凹状円錐形ドット8の反射面B
と面に配置した凹状円錐形ドット8の数で凹状円錐形ド
ット8の直径が算出される。この時の反射光量は反射B
*凹状円錐形ドット8の数=Lとなり、Lに近似となる
ように凹状円錐形ドット8の数と直径を決め面全体に配
置すれば良いになる。The present invention utilizes this principle, and the 45 ° reflection surface of this total reflection prism is divided into a light reflector of concave conical dots 6. Reflective surface B of concave conical dot 8
The diameter of the concave conical dots 8 is calculated by the number of the concave conical dots 8 arranged on the plane. The amount of reflected light at this time is reflected B
* The number of concave conical dots 8 = L, and the number and diameter of the concave conical dots 8 are determined so as to approximate L, and it is sufficient to arrange them on the entire surface.
【0034】[0034]
【0018】図5(a)〜(c)に示すごとく凹状円錐
形ドット8の反射面Bに当った光は矢印方向Hに反射さ
れる、反射面B以外に当った光は導光板2内部の凹状円
錐形ドット8と導光板2の平面で反射を繰り返し凹状円
錐形ドット8の反射面Bに当たり矢印方向Hに反射され
るまで進んでいく、この結果光量の減衰の少ない反射が
次々と他の凹状円錐形ドット8に進むため高効率の平面
発光が可能になる。このように、この凹状円錐形ドット
8による光反射は入射光の量と相関関係があり、設計段
階で発光面の光量の試算が可能である。As shown in FIGS. 5A to 5C, the light hitting the reflecting surface B of the concave conical dot 8 is reflected in the direction H of the arrow, and the light hitting other than the reflecting surface B is inside the light guide plate 2. The concave conical dots 8 and the plane of the light guide plate 2 repeatedly reflect until they hit the reflecting surface B of the concave conical dots 8 and are reflected in the direction H of the arrow. Since it goes to the concave conical dot 8 of FIG. As described above, the light reflection by the concave conical dots 8 has a correlation with the amount of incident light, and the light amount of the light emitting surface can be estimated at the design stage.
【0035】[0035]
【0019】この凹状円錐ドット8は以下示す条件で試
作され、その成果は実験により確認され、頂角は80〜
100°で光反射は最良の結果が得られた。This concave conical dot 8 was prototyped under the following conditions, and the results were confirmed by experiments.
At 100 ° the light reflection gave the best results.
【0036】[0036]
【0020】頂 角 :80〜100° 底面の直径 :約450μm 高さ :約225μm ドットのピッチ:1.2mm 導光板寸法 :200mm*150mm*3mm(幅
*奥行*厚さ)Vertical angle: 80 to 100 ° Bottom diameter: Approx. 450 μm Height: 225 μm Dot pitch: 1.2 mm Light guide plate dimension: 200 mm * 150 mm * 3 mm (width * depth * thickness)
【0037】[0037]
【0021】又、この凹状円錐形ドット8の頂角の先端
部分を球状に加工、さらには、凹状円錐形ドット8の全
面を鏡面仕上げすることにより光の減衰はより少なくな
り、より精度の高い光反射ができる。Further, by processing the tip end portion of the apex angle of the concave conical dot 8 into a spherical shape, and further by mirror-finishing the entire surface of the concave conical dot 8, the attenuation of light is reduced and the accuracy is higher. Can reflect light.
【0038】[0038]
【0022】この凹状円錐形ドット8の加工は面全体に
均一な形状、寸法にすることが要求されるため成型、レ
ーザ加工等でおこなわれる。又、導光板2の成型と同時
に一体成型でおこなうこともできる。The processing of the concave conical dots 8 is performed by molding, laser processing or the like because it is required that the entire surface has a uniform shape and size. Further, the light guide plate 2 and the light guide plate 2 can be integrally molded at the same time.
【0039】[0039]
【0023】このように、この第1実施例によれば、導
光板2の一側面より入射した光を導光板2の裏面の光反
射体5の凹状円錐形ドット8で反射する構成にしたた
め、光量の減衰の少ない光反射を行い、照射面全面の光
度を均一にすることができる。又、設計段階で発光面の
光量の計算が可能で実験時間や設備が節約できる。さら
に、この実施例では凹状円錐形ドットで説明している
が、凸状円錐形ドットでも光の反射に関しては同様の効
果があり、応用できる事は勿論である。As described above, according to the first embodiment, since the light incident from one side surface of the light guide plate 2 is reflected by the concave conical dots 8 of the light reflector 5 on the back surface of the light guide plate 2, By performing light reflection with little attenuation of light quantity, it is possible to make the luminous intensity uniform over the entire irradiation surface. In addition, the amount of light emitted from the light emitting surface can be calculated at the design stage, which saves experiment time and equipment. Further, in this embodiment, the concave conical dots are used for explanation, but the convex conical dots have similar effects with respect to light reflection and can be applied.
【0040】[0040]
【0024】次に、本発明の第2実施例について説明す
る。これは導光板2の表面に溝9を図6(a)〜(b)
のごとく形成したものである。この溝の効果は、第1実
施例で説明したように、導光板2の一側面より入射した
光は導光板2の裏面の光反射体の凹状円錐形ドット8で
反射され、散乱板4の全表面から光が均一に放射される
が、この導光板2の表面の溝9を形成したことにより、
裏面の凹状円錐形ドット8により反射された光を分割す
ることができ、光は一層拡散され、照射面の全面をより
均一に照射することがでる。又、同時に導光板2の表面
の溝9を形成することにより凹状円錐形ドット8の反射
面B以外で反射された光をさらに角度を変え反射するこ
とが可能になり反射光をより反射面に集光する効果があ
る。Next, a second embodiment of the present invention will be described. This is because the groove 9 is formed on the surface of the light guide plate 2 as shown in FIGS.
It is formed like. As described in the first embodiment, the effect of this groove is that the light incident from one side surface of the light guide plate 2 is reflected by the concave conical dots 8 of the light reflector on the back surface of the light guide plate 2, and the light of the scattering plate 4 is changed. Light is uniformly emitted from all surfaces, but by forming the grooves 9 on the surface of the light guide plate 2,
The light reflected by the concave conical dots 8 on the back surface can be split, the light is more diffused, and the entire illuminated surface can be illuminated more uniformly. Further, by forming the groove 9 on the surface of the light guide plate 2 at the same time, it is possible to further change the angle and reflect the light reflected by the concave conical dots 8 other than the reflecting surface B, so that the reflected light is further reflected. Has the effect of collecting light.
【0041】[0041]
【0025】溝9が無い場合の光路は図7(a)のよう
に、入射光は円錐形ドット8によって反射され表面に当
り屈折するが反対方向に曲がるだけで光の拡散は少な
い。図7(b)のように溝9で屈折した時は表面に当る
部分により反射部光路が変化し、光はより反射面Bに集
光される。図7(c)は表面の溝9越に円錐形ドット8
を見た時の反射面Bの図で、反射面Bがプリズム効果に
より左右に分割されることができ、光はより拡散され、
平面発光がより可能になる。なお、溝の形状は次の条件
で確認実験を行ない、最良の結果が得られた。As shown in FIG. 7A, the optical path without the groove 9 is such that the incident light is reflected by the conical dot 8 and hits the surface to be refracted, but the light is only diffused in the opposite direction, and the diffusion of the light is small. When the light is refracted in the groove 9 as shown in FIG. 7B, the optical path of the reflecting portion is changed by the portion that contacts the surface, and the light is more focused on the reflecting surface B. FIG. 7C shows the conical dot 8 over the groove 9 on the surface.
In the figure of the reflection surface B when seeing, the reflection surface B can be divided into right and left by the prism effect, and the light is more diffused,
Flat emission becomes more possible. The groove shape was checked under the following conditions, and the best result was obtained.
【0042】[0042]
【0026】半径 :800〜1000μm 溝巾 :500〜700μm 深さ :5〜10μm 溝のピッチ:1000〜1200μmRadius: 800 to 1000 μm Groove width: 500 to 700 μm Depth: 5 to 10 μm Groove pitch: 1000 to 1200 μm
【0043】[0043]
【0027】また、この溝の加工は円錐形ドット8と同
様に導光板の表面全体に均一な形状で形成することが要
求されるため、成型、レーザ加工等の方法でおこなわれ
る。又、円錐形ドット8と同時に一体成型、さらには、
導光板2全体の成型と時に円錐形ドット8と共に一体成
型でおこなうことも可能である。Further, since the groove is required to be formed in a uniform shape on the entire surface of the light guide plate as in the case of the conical dot 8, molding or laser processing is used. In addition, the conical dot 8 is integrally molded at the same time,
It is also possible to mold the entire light guide plate 2 and, at times, integrally mold it with the conical dots 8.
【0044】[0044]
【0028】[0028]
【0045】[0045]
【発明の効果】以上述べてきたように、本発明によれ
ば、導光板の一側面より入射した光を、導光板の裏面の
円錐形ドットで反射し、又、導光板表面の溝に設けた光
拡散体で効率良く反射、拡散をおこなうため、光量の減
衰の少ない光反射、拡散をより高い精度で行い、照射面
の光の強度を均一に行うことができ、液晶表示装置など
のバックライト照明に顕著な効果がある。又、設計段階
で発光面の光量の試算が可能で実験時間や設備が節約で
きるのが特徴である。As described above, according to the present invention, the light incident from one side surface of the light guide plate is reflected by the conical dots on the back surface of the light guide plate, and is provided in the groove on the surface of the light guide plate. Since the light diffuser efficiently reflects and diffuses the light, the light can be reflected and diffused with less attenuation of the light intensity with higher accuracy, and the intensity of the light on the irradiation surface can be made uniform. It has a noticeable effect on light lighting. In addition, it is a feature that the trial calculation of the light quantity of the light emitting surface is possible at the design stage, and the experiment time and equipment can be saved.
【図面の簡単な説明】[Brief description of drawings]
【図1】第1実施例の面状光源装置の斜視図である。FIG. 1 is a perspective view of a planar light source device according to a first embodiment.
【図2】図1の面状光源装置の側面図である。FIG. 2 is a side view of the planar light source device of FIG.
【図3】図3(a)は図1の導光板の裏面の光反射体の
パターンの例を示す斜視図である、図3(b)は光拡散
体の凹状円錐形ドットの断面形状図である。3 (a) is a perspective view showing an example of a pattern of a light reflector on the back surface of the light guide plate of FIG. 1, and FIG. 3 (b) is a sectional shape view of a concave conical dot of a light diffuser. Is.
【図4】図4(a)は導光板による光反射の原理を説明
をする側面図、図4(b)は同じく原理を説明をする図
で、導光板の端部を分割した場合の光反射を説明する側
面図である。FIG. 4 (a) is a side view for explaining the principle of light reflection by the light guide plate, and FIG. 4 (b) is a diagram for explaining the same principle. Light when the end of the light guide plate is divided. It is a side view explaining reflection.
【図5】図4(a)は凹状円錐ドットでの光反射を示す
平面図、図4(b)は凹状円錐ドットでの光反射を示す
側面図、図4(c)は凹状円錐ドットでの光反射を示す
斜視図。5 (a) is a plan view showing light reflection on a concave conical dot, FIG. 4 (b) is a side view showing light reflection on a concave conical dot, and FIG. 4 (c) is a concave cone dot. The perspective view which shows the light reflection of.
【図6】図6(a)は第2実施例の導光板の表面に溝を
形成した時の斜面図である、図6(b)は導光板の凹状
円錐ドットと溝を示す断面図である。FIG. 6 (a) is a perspective view when a groove is formed on the surface of the light guide plate of the second embodiment, and FIG. 6 (b) is a sectional view showing the concave conical dot and groove of the light guide plate. is there.
【図7】図7(a)は第2実施例の導光板表面の溝での
光の反射の説明図、図7(b)は溝部による光の屈折の
説明図、図7(c)は溝による光の屈折の説明図であ
り、溝部越に凹状円錐ドットを見た図である。7A is an explanatory view of light reflection at a groove on the surface of the light guide plate of the second embodiment, FIG. 7B is an explanatory view of light refraction at the groove portion, and FIG. It is an explanatory view of refraction of light by a groove, and is a figure which saw a concave conical dot over a groove part.
【図8】従来の実施例の面状光源装置の一例の断面図で
ある。FIG. 8 is a sectional view of an example of a conventional planar light source device.
【図9】図8の導光板の裏面の光反射体のパターンの平
面図である。9 is a plan view of a pattern of a light reflector on the back surface of the light guide plate of FIG.
1:光入射部 2:導光板 3:光源(陰極管等) 4:散乱板 5:光反射体 6:反射板 7:印刷ドット 8:凹状円錐形ドット 9:導光板の表面の溝 1: Light incident part 2: Light guide plate 3: Light source (cathode tube etc.) 4: Scattering plate 5: Light reflector 6: Reflector plate 7: Printing dot 8: Concave conical dot 9: Groove on the surface of the light guide plate
Claims (10)
も一側面端部を光入射部とし、この導光板の一面に光反
射が可能な光反射体が設けられた面状光源装置におい
て、前記光反射体が円錐形ドットから構成されているこ
とを特徴とする面状光源装置。1. A planar light source device in which at least one side end of a light guide plate made of a translucent material is used as a light incident part, and a light reflector capable of reflecting light is provided on one surface of the light guide plate, A planar light source device, wherein the light reflector is composed of conical dots.
度が80〜100°に形成されていることを特徴とする
請求項1記載の面状光源装置。2. The planar light source device according to claim 1, wherein the conical dots of the light reflector have an apex angle of 80 to 100 °.
端が球状に加工されていることを特徴とする請求項1記
載の面状光源装置。3. The planar light source device according to claim 1, wherein the tip of the apex angle of the conical dot of the light reflector is processed into a spherical shape.
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
装置。4. The planar light source device according to claim 1, wherein the conical dots of the light reflector are formed in a convex shape.
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
装置。5. The planar light source device according to claim 1, wherein the conical dots of the light reflector are formed in a concave shape.
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
装置。6. The planar light source device according to claim 1, wherein the conical dots of the light reflector are formed on a mirror surface.
で形成されていることを特徴とする請求項1記載の面状
光源装置。7. The planar light source device according to claim 1, wherein the conical dots of the light reflector are formed by molding.
一体成型されていることを特徴とする請求項1記載の面
状光源装置。8. The planar light source device according to claim 1, wherein the conical dots of the light reflector are integrally molded with the light guide plate.
工されていることを特徴とする請求項1記載の面状光源
装置。9. The planar light source device according to claim 1, wherein the conical dots of the light reflector are laser-processed.
た面と反対側面に溝を形成したことを特徴とする請求項
1記載の面状光源装置。10. The planar light source device according to claim 1, wherein a groove is formed on a side surface of the light guide plate opposite to a surface on which the conical dots are formed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7155263A JPH08327807A (en) | 1995-05-30 | 1995-05-30 | Surface light source device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7155263A JPH08327807A (en) | 1995-05-30 | 1995-05-30 | Surface light source device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08327807A true JPH08327807A (en) | 1996-12-13 |
Family
ID=15602096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7155263A Pending JPH08327807A (en) | 1995-05-30 | 1995-05-30 | Surface light source device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08327807A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999006881A1 (en) * | 1997-07-31 | 1999-02-11 | Hitachi, Ltd. | Liquid crystal display |
JPH11109136A (en) * | 1997-10-06 | 1999-04-23 | Kimoto & Co Ltd | Light guide plate for surface light source |
FR2832811A1 (en) * | 2001-11-28 | 2003-05-30 | Saint Gobain | Transparent textured plate with high optical transmittance e.g. for LCD back light, has at least one face textured with geometric relief patterns formed of pyramids or cones |
KR100386734B1 (en) * | 1999-10-14 | 2003-06-09 | 아사히 가세이 가부시키가이샤 | Light-conducting plate and method of producing the same |
KR20050079257A (en) * | 2004-02-05 | 2005-08-10 | 윤태중 | Backlight unit combined light division lgp with direction alignment reflector |
KR100590926B1 (en) * | 1999-12-24 | 2006-06-19 | 비오이 하이디스 테크놀로지 주식회사 | Light guiding plate for back light unit |
JP2007080789A (en) * | 2005-09-16 | 2007-03-29 | New Industry Research Organization | Light guide |
CN1318865C (en) * | 2002-12-20 | 2007-05-30 | 鸿富锦精密工业(深圳)有限公司 | Light board and light source system |
US7270466B2 (en) | 2002-11-13 | 2007-09-18 | Samsung Electronics Co., Ltd. | Reflector for back light assembly and back light assembly using the same |
CN100351654C (en) * | 2003-02-18 | 2007-11-28 | 鸿富锦精密工业(深圳)有限公司 | A process for making printing type light conducting board |
US7488918B2 (en) | 2003-01-29 | 2009-02-10 | Hon Hai Precision Industry Co., Ltd. | Method and apparatus for manufacturing printed light guide plate |
EP2180360A2 (en) | 2008-10-27 | 2010-04-28 | Kuroda Electric Co., Ltd. | Light guide panel, method for manufacuring the same and light source unit |
WO2012005043A1 (en) * | 2010-07-08 | 2012-01-12 | シャープ株式会社 | Liquid crystal display device |
US8317386B2 (en) | 2006-07-24 | 2012-11-27 | Panasonic Corporation | Laser-lit planar illumination device and LCD using such device |
JP2013109355A (en) * | 2010-03-31 | 2013-06-06 | Sony Corp | Display, and light source device |
US11073650B2 (en) | 2016-11-08 | 2021-07-27 | Denso Corporation | Display device for vehicles |
-
1995
- 1995-05-30 JP JP7155263A patent/JPH08327807A/en active Pending
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WO1999006881A1 (en) * | 1997-07-31 | 1999-02-11 | Hitachi, Ltd. | Liquid crystal display |
US6661479B2 (en) | 1997-07-31 | 2003-12-09 | Hitachi, Ltd. | Liquid crystal display apparatus |
US6803977B2 (en) | 1997-07-31 | 2004-10-12 | Hitachi, Ltd. | Liquid crystal display apparatus |
US6958790B2 (en) | 1997-07-31 | 2005-10-25 | Hitachi, Ltd. | Liquid crystal display apparatus |
JPH11109136A (en) * | 1997-10-06 | 1999-04-23 | Kimoto & Co Ltd | Light guide plate for surface light source |
KR100386734B1 (en) * | 1999-10-14 | 2003-06-09 | 아사히 가세이 가부시키가이샤 | Light-conducting plate and method of producing the same |
KR100590926B1 (en) * | 1999-12-24 | 2006-06-19 | 비오이 하이디스 테크놀로지 주식회사 | Light guiding plate for back light unit |
FR2832811A1 (en) * | 2001-11-28 | 2003-05-30 | Saint Gobain | Transparent textured plate with high optical transmittance e.g. for LCD back light, has at least one face textured with geometric relief patterns formed of pyramids or cones |
WO2003046617A1 (en) * | 2001-11-28 | 2003-06-05 | Saint-Gobain Glass France | Textured transparent plate with high light transmission |
CN100409038C (en) * | 2001-11-28 | 2008-08-06 | 法国圣戈班玻璃厂 | Textured transparent panel having a high light transmission |
US7368655B2 (en) | 2001-11-28 | 2008-05-06 | Saint-Gobain Glass France | Textured transparent plate with high light transmission |
US7270466B2 (en) | 2002-11-13 | 2007-09-18 | Samsung Electronics Co., Ltd. | Reflector for back light assembly and back light assembly using the same |
CN1318865C (en) * | 2002-12-20 | 2007-05-30 | 鸿富锦精密工业(深圳)有限公司 | Light board and light source system |
US7488918B2 (en) | 2003-01-29 | 2009-02-10 | Hon Hai Precision Industry Co., Ltd. | Method and apparatus for manufacturing printed light guide plate |
CN100351654C (en) * | 2003-02-18 | 2007-11-28 | 鸿富锦精密工业(深圳)有限公司 | A process for making printing type light conducting board |
KR20050079257A (en) * | 2004-02-05 | 2005-08-10 | 윤태중 | Backlight unit combined light division lgp with direction alignment reflector |
JP2007080789A (en) * | 2005-09-16 | 2007-03-29 | New Industry Research Organization | Light guide |
US8317386B2 (en) | 2006-07-24 | 2012-11-27 | Panasonic Corporation | Laser-lit planar illumination device and LCD using such device |
EP2180360A2 (en) | 2008-10-27 | 2010-04-28 | Kuroda Electric Co., Ltd. | Light guide panel, method for manufacuring the same and light source unit |
JP2013109355A (en) * | 2010-03-31 | 2013-06-06 | Sony Corp | Display, and light source device |
US9268148B2 (en) | 2010-03-31 | 2016-02-23 | Sony Corporation | Light source device and stereoscopic display apparatus |
US9507159B2 (en) | 2010-03-31 | 2016-11-29 | Sony Corporation | Light source device and stereoscopic display apparatus |
JP2012018308A (en) * | 2010-07-08 | 2012-01-26 | Sharp Corp | Liquid crystal display device |
WO2012005043A1 (en) * | 2010-07-08 | 2012-01-12 | シャープ株式会社 | Liquid crystal display device |
US9086589B2 (en) | 2010-07-08 | 2015-07-21 | Sharp Kabushiki Kaisha | Liquid crystal display device |
US11073650B2 (en) | 2016-11-08 | 2021-07-27 | Denso Corporation | Display device for vehicles |
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