JPH03214191A - Plane light emitting device - Google Patents
Plane light emitting deviceInfo
- Publication number
- JPH03214191A JPH03214191A JP2009300A JP930090A JPH03214191A JP H03214191 A JPH03214191 A JP H03214191A JP 2009300 A JP2009300 A JP 2009300A JP 930090 A JP930090 A JP 930090A JP H03214191 A JPH03214191 A JP H03214191A
- Authority
- JP
- Japan
- Prior art keywords
- light
- plate
- light source
- light guide
- emitting device
- 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.)
- Granted
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 238000000149 argon plasma sintering Methods 0.000 claims description 10
- 238000009792 diffusion process Methods 0.000 abstract description 8
- 230000031700 light absorption Effects 0.000 abstract description 3
- 230000003287 optical effect Effects 0.000 abstract 4
- 238000000034 method Methods 0.000 description 13
- 238000007639 printing Methods 0.000 description 5
- 238000007650 screen-printing Methods 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004925 Acrylic resin Substances 0.000 description 2
- 229920000178 Acrylic resin Polymers 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 239000000113 methacrylic resin Substances 0.000 description 2
- 238000010422 painting Methods 0.000 description 2
- 239000004417 polycarbonate Substances 0.000 description 2
- 229920000515 polycarbonate Polymers 0.000 description 2
- 229920005668 polycarbonate resin Polymers 0.000 description 2
- 239000004431 polycarbonate resin Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000005020 polyethylene terephthalate Substances 0.000 description 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 2
- 229920005990 polystyrene resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、デイスプレィとして薄形の電飾照明、及び、
薄形軽量のランプトップパソコン、ワープロ、液晶ＴＶ
のバックライト等に利用できる面発光装置に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to thin electric lighting as a display, and
Thin and lightweight lamp top computer, word processor, LCD TV
The present invention relates to a surface emitting device that can be used as a backlight, etc.
従来の技術
従来、この種の面発光装置としては２種の構造のものが
知られている。一つはボトムライト方式の発光装置で照
明板下部に光源を配置して下面より光を照射するもの（
例えば、特公昭５９−８８０９号）であり、もう一つは
エツジライト方式の発光装置で導光板側部に光源を配置
して側面より光を照射するもの（例えば、特開昭６３−
６２１０４号）である。2. Description of the Related Art Conventionally, two types of structures have been known as this type of surface emitting device. One is a bottom light type light emitting device, which places a light source at the bottom of the lighting board and emits light from the bottom (
For example, Japanese Patent Publication No. 59-8809), and the other is an edge-light type light emitting device in which a light source is placed on the side of a light guide plate and light is emitted from the side (for example, Japanese Patent Publication No. 63-88).
No. 62104).
発明が解決しようとする課題
Ｉ、かじながら、上記ボトムライト方式の発光装置では
、該発光装置の厚みを薄くするとつまり光源と光拡散板
の距離を短くすると光源の光が周辺に届きにくくなり、
発光装置としては光源上部は明るく周囲は暗いという輝
度ムラが発生する一方、上記発光装置の輝度を高くする
とそ。７１Ｊｌ造り厚くなるという欠点がある。Problem I that the invention aims to solve: In the above-mentioned bottom light type light emitting device, when the thickness of the light emitting device is made thinner, that is, when the distance between the light source and the light diffusing plate is shortened, the light from the light source becomes difficult to reach the surrounding area.
As a light emitting device, uneven brightness occurs where the upper part of the light source is bright and the surrounding area is dark, but if the brightness of the light emitting device is increased, this will occur. 71Jl has the disadvantage of being thicker.
一方、Ｌ記エッノライト方式の発光装置では、該発光装
置の厚みを薄くすることはできるが、その構造上、線光
源が導光仮に面した半分の光しかｆｌｌ用できないため
、先ロスが多く低輝度になるといっｆこ欠点かある。On the other hand, in the case of a light emitting device using the L enolite method, although the thickness of the light emitting device can be reduced, due to its structure, only half of the light that the linear light source faces toward the light guide can be used as a full light, so there is a lot of loss at the front. There are some drawbacks when it comes to brightness.
従って、本発明の目的は、上記問題を解決することにあ
って、輝度を高くすることができるとともに、その構造
の厚みを薄くすることができる面発光装置を提供するこ
とにある。Therefore, an object of the present invention is to provide a surface emitting device that can increase the brightness and reduce the thickness of its structure in order to solve the above problems.
課題を解決するための手段
上記目的を達成するために、本発明は、エツジライト方
式の面発光装置において、線光源を導光体で挟むように
構成し、導光体を通る光だけでなく、」二足線光源から
導光体を透過しない光をも有効に利用することにより、
輝度をより高めるように構成した。すなわち、線光源の
両側に透明導光体を配置するとともに該導光体の上方に
光拡散板を配置し、上記光拡散板の下面に、照度分布に
ほぼ比例する面積分布を打セる光吸収部を形成し、上記
導光体の裏面に上記線光源から遠ざかるに−っれてその
面積か次第に大きくなるように光拡散透過部を形成する
とともに、」−記導光体の」−記光拡散透過部を形成し
た裏面に光散乱反射板を配置するように構成した。Means for Solving the Problems In order to achieve the above object, the present invention is an edge light type surface emitting device in which a linear light source is sandwiched between light guides, and the light not only passes through the light guide, but also ” By effectively utilizing the light that does not pass through the light guide from the bipedal light source,
Constructed to further increase brightness. That is, transparent light guides are arranged on both sides of a linear light source, and a light diffusing plate is arranged above the light guide, and light is distributed on the lower surface of the light diffusing plate in an area distribution approximately proportional to the illuminance distribution. an absorbing portion is formed, and a light diffusing and transmitting portion is formed on the back surface of the light guide so that its area gradually increases as it moves away from the linear light source, and A light scattering and reflecting plate was arranged on the back surface on which the light diffusing and transmitting portion was formed.
上記構成においては、ｈ ＋ｆ’導光体の表面に光拡散
部を形成するように構成することもてきる。In the above configuration, a light diffusing portion may be formed on the surface of the h +f' light guide.
また、上記構成においては、上記光拡散透過部はドツト
状またはストライプ状に形成されるようにすることもで
きる。Further, in the above structure, the light diffusing and transmitting portion may be formed in a dot shape or a stripe shape.
発明の作用・効果
上記構成によれば、Ｌ配線光源の下方向より出た光は上
記散乱部により光拡散板の表面側に反射され、その表面
から照射される。また、線光源の上方向より出た光は一
ト記光吸収部により均一化された後、光拡散板の表面よ
り照射される。また、線光源の横方向すなわち線光源の
長平方向と直交する方向より出た光は上記導光体内を透
過して上記導光体の裏面の鏡面状反射部と光拡散透過部
とにより光拡散板の表面側に導かれ、その表面から照射
される。すなわち、上記線光源より横方向に出た光は、
各光源の近傍では、上記光源より照射された光のうち大
部分の光か透明導光体内部で入射角と反射角が等しく全
反射を繰り返し、導光体の中央付近へ導かれろ。一方、
残りの光が、面積的には小さい光拡散透過部で拡散して
直接的にまたは光拡散透過部を透過し、導光体裏面の光
散乱反射板で反射して間接的に導光体の表面側に導かれ
、その表面から照射される。また、上記光源から遠い部
分では、大部分の光が面積的に大きい光拡散透過部で直
接または間接的に導光体の表面側へ導かれ、その表面か
ら照射される一方、残りの光か導光体内部で入射角と反
射角が等しく全反射を繰り返して導光体の側部付近へ導
かれる。従って、線光源より横方向に照射された光のお
いては、光源近傍の光量の強い部分の光を上記光源から
遠い部分の光量の弱い部分に導くことができ、全体とし
て光のロスが少なく非常に高輝度で均一な面光源を形成
することになる。すなわち、アルミニラ１４蒸着などの
鏡面を利用して光を反射させるのではなく、導光体の内
部の全反射を利用して光束を変化さけるため、光ロスか
少なく非常に高輝度て均一な面光源が得られる。Effects of the Invention According to the above configuration, the light emitted from the lower side of the L-wire light source is reflected by the scattering portion toward the surface side of the light diffusing plate, and is irradiated from the surface. Further, the light emitted from above the linear light source is made uniform by the light absorbing section, and then is irradiated from the surface of the light diffusing plate. In addition, light emitted from the lateral direction of the linear light source, that is, from the direction orthogonal to the longitudinal direction of the linear light source, passes through the light guide and is diffused by the specular reflection part and the light diffusion transmitting part on the back surface of the light guide. The light is guided to the surface of the plate and irradiated from that surface. In other words, the light emitted from the linear light source in the horizontal direction is
In the vicinity of each light source, most of the light emitted from the light source undergoes total internal reflection within the transparent light guide with equal angles of incidence and reflection, and is guided to the vicinity of the center of the light guide. on the other hand,
The remaining light is diffused by the light diffusing and transmitting part, which is small in terms of area, and passes through the light diffusing and transmitting part either directly or through the light diffusing and transmitting part, and is reflected by the light scattering and reflecting plate on the back of the light guide and indirectly affects the light guide. It is guided to the surface side and irradiated from that surface. In addition, in the area far from the light source, most of the light is guided directly or indirectly to the surface side of the light guide through the large-area light diffusing and transmitting part, and is irradiated from the surface, while the remaining light is Inside the light guide, the incident angle and the reflection angle are equal, and the light undergoes repeated total reflection and is guided to the vicinity of the side of the light guide. Therefore, in the case of light irradiated laterally from a line light source, the light in the area where the light intensity is strong near the light source can be guided to the area where the light intensity is weak in the area far from the light source, resulting in less light loss as a whole. A very high brightness and uniform surface light source is formed. In other words, rather than reflecting light using a mirror surface such as Aluminum 14 vapor deposited, it uses total internal reflection inside the light guide to avoid changes in the luminous flux, resulting in a very bright and uniform surface with little light loss. A light source is obtained.
従って、上記構成によれば、」二足線光源の光を無駄な
く全て利用することにより、装置の厚みが薄く高輝度な
面発光装置か得られる。すなわち、面発光装置全体の厚
みをエノンライト方式と同じように薄くできるため、非
常にコンパクトでかつ軽量なものとなり、また上記線光
源の光束を上下左右全て無駄なく均一に表示面に導くこ
とができるため、従来に無い非常に高輝度のものが得ら
れる。Therefore, according to the above configuration, by utilizing all the light from the bipedal light source without wasting it, a surface emitting device with a small thickness and high brightness can be obtained. In other words, the overall thickness of the surface emitting device can be made as thin as the Enon light method, making it extremely compact and lightweight, and the luminous flux of the above-mentioned linear light source can be uniformly guided to the display surface without wasting any waste. Therefore, it is possible to obtain extremely high brightness that has not been seen before.
実施例
以下に、本発明にかかる実施例を第１〜７図に基づいて
詳細に説明する。EXAMPLES Below, examples according to the present invention will be explained in detail based on FIGS. 1 to 7.
本実施例にがかる面発光装置は、第１．２．３図に示す
ように、線光源１の両側に透明な導光体として導光板２
を配置するとともに、上記導光板２の上方に光拡散板３
を配置し、該光拡散板３の下面に、照（９）分布にほぼ
比例する面積分布を有する光吸収部６を形成ずろ一方、
上記導光板２の裏面に、上記光源１．１から遠ざかるに
つれてその面積か次第に大きくなるように形成した光拡
散透過部５．．５を形成するとともに、上記導光板２の
上記光拡散透過部５．・・、５を形成した裏面に光散乱
反射板７を配置するように大略構成した。As shown in FIG. 1.2.3, the surface emitting device according to this embodiment has light guide plates 2 as transparent light guides on both sides of a linear light source 1.
A light diffusing plate 3 is placed above the light guide plate 2.
is arranged, and a light absorbing portion 6 having an area distribution approximately proportional to the light distribution (9) is formed on the lower surface of the light diffusing plate 3.
A light diffusing and transmitting section 5. formed on the back surface of the light guide plate 2 so that its area gradually increases as it moves away from the light source 1.1. ．． 5, and the light diffusing and transmitting portion 5 of the light guide plate 2. .
に記光拡牧板３は、導光板２を透過してきた線光源ｌか
らの光をさらに拡散し、面発光装置の発光面となるもの
である。この光拡散板３の材料としては、光拡散性を有
するメタクリル樹脂板、アクリル樹脂板、ポリスチレン
樹脂板、ポリカーボネイト樹脂板、または、塩化ビニル
樹脂板を用いるか、表面に拡散剤をコーティングしたポ
リエチレ〉・テレフタレー）（ＰＥＴ）、ポリカーボネ
ート（ＰＣ）、または、合成紙等を用いるか、あるいは
、表面を物理的に粗面化した合成樹脂板、テレフタル酸
ポリエチレン、または、ポリカーボネートなとよりなる
板材を厚み０．０２５〜４ｍｍにて用い、その裏面には
各種印刷法または転写法等にて光吸収部６を形成する。The light diffusing plate 3 further diffuses the light from the linear light source l that has passed through the light guide plate 2, and serves as a light emitting surface of the surface emitting device. The material of the light diffusing plate 3 is a methacrylic resin board, an acrylic resin board, a polystyrene resin board, a polycarbonate resin board, a vinyl chloride resin board, or a polyethylene coated with a diffusing agent on the surface.・Use PET, polycarbonate (PC), synthetic paper, etc., or use a board made of synthetic resin board with a physically roughened surface, polyethylene terephthalate, or polycarbonate, etc. A thickness of 0.025 to 4 mm is used, and the light absorbing portion 6 is formed on the back surface by various printing methods or transfer methods.
この光吸収部６は、上記線光源！の照度分布にほぼ比例
する面積分布を存するように形成される。上記光吸収部
６の代わりに光反射部を同様に形成しても同じような作
用・効果を奏するようにしてもよい。This light absorption section 6 is the above-mentioned linear light source! The area distribution is approximately proportional to the illuminance distribution. A light reflecting section may be similarly formed in place of the light absorbing section 6 to achieve similar effects and effects.
上記各導光板２は平板よりなり、第２図に拡大して示す
ように、」二足線光源ｌの両側に、すなわち該線光源ｌ
の長手軸に直交する断面における両側に、線光源１を挟
むように夫々配置する。上記透明導光板２の材料として
は、ガラス、メタクリル樹脂板、アクリル樹脂板、ポリ
スチレン樹脂板、ポリカーボネイト樹脂板、または、塩
化ビニル樹脂板等で、透明性が良く光線透過率が良いも
のを用い、その厚みは２〜３０ｍｍか好ましい。Each of the light guide plates 2 is a flat plate, and as shown in an enlarged view in FIG.
A linear light source 1 is placed on both sides of the cross section perpendicular to the longitudinal axis of the light source 1 . The material of the transparent light guide plate 2 is glass, methacrylic resin plate, acrylic resin plate, polystyrene resin plate, polycarbonate resin plate, vinyl chloride resin plate, etc., which has good transparency and light transmittance. The thickness is preferably 2 to 30 mm.
一方、上記各導光板２の裏面には、上記光＃、１から遠
ざかるにつれてその面積が次第に大きくなるようなドツ
ト状グラデーンヨンの光拡散透過部５、・１５をマッド
インキでスクリーン印刷法にて形成する。この光拡散透
過１１１！Ｓ５．・・・、５は、第２図に示すように、
円形であって、その径寸法を変えることによって面積を
変化させる。Ｌ記各光拡散透過部５は炭酸カルシウム、
酸化チタン、ソリ力などの光拡散性を存する顔料を含む
インキをグラヒア印刷、オフセブト印刷、スクリーン印
刷などの印刷法まｆコは転写法なとにて形成する。上記
光源ｌよりこの光拡散透過部５．・、５に到達した光は
、ここで拡散し、導光板２の表側に向かったり、導光板
２のさらに光源１から離れた方向なと多方向に向かう。On the other hand, on the back surface of each of the light guide plates 2, dot-shaped gradation light diffusion/transmission parts 5, 15 are formed using mud ink using a screen printing method, the area of which gradually increases as the distance from the light #1 increases. do. This light diffusion transmission 111! S5. ..., 5, as shown in Figure 2,
It is circular, and its area can be changed by changing its diameter. Each light diffusing and transmitting part 5 in L is made of calcium carbonate,
An ink containing a pigment having light diffusive properties such as titanium oxide and warp is formed using a printing method such as graphia printing, offset printing, or screen printing, or a transfer method. From the light source 1, this light diffuses and transmits part 5. The light that has reached the light guide plate 2 is diffused here and goes in multiple directions, such as toward the front side of the light guide plate 2 and further away from the light source 1 of the light guide plate 2.
旧記光拡散透過部５．・、５は円形のト・ト状に形成し
たが、円形に限らず任意の形状でドツト状に形成しても
よいとともに、ストライプ状に形成してしよい。また、
第７図に示すように菱影としてもよい。Old light diffusion transmitting section 5. . . , 5 are formed in a circular dot shape, but the shape is not limited to a circle, but may be formed in an arbitrary dot shape, or may be formed in a stripe shape. Also,
It may also be a diamond shadow as shown in FIG.
さらに、ト記散乱反射板７は、上記３個の導光板２．２
．２＆び光源１．１を収納するケースの導光板２，２．
２及び光源１．１に相対する面を散乱反射効率の良い白
色塗料にて塗装または印刷することにより形成する。」
−記反射板７は、上記導光板２の光＃：散透過部５．・
・、５か形成された裏面において、谷先拡散透過部５を
透過することにより導光板２の裏面側に到達する光を上
記反射板７で反射して、導光板２のさらに光源Ｉより離
れる方向に効率良く導くものである。すなわち、上記光
散乱反射板７と光拡散透過部５とが重なる部分において
、光は光拡散透過部５で拡散するだけでなく、光拡散透
過部５を通り抜けるものもある。光拡散透過部５を通り
抜けた光は光散乱反射板７で反射し、再び光拡散透過部
５に入る。光散乱反射板７では、入射角に関係なく反射
散乱する。したがって、この光は光拡散透過部５から光
散乱反射板７を介して光拡散透過部５を通過し、合計３
回拡散・散乱部分を経るので、ロスが少なく発光するこ
とになる。この反射板７は上記導光板２とは別体に形成
され、かつ、該導光板２の裏面に重ね合わせるように配
置される。よって、導光板２の光拡散透過部５が形成さ
れていない部分には密着しないようにし、該部分と反射
板７との間には少なくともわずかな隙間が形成されるよ
うにする。Furthermore, the above-mentioned scattering reflector plate 7 is connected to the three light guide plates 2 and 2.
．． 2 & light guide plate 2 of the case housing the light source 1.1.
2 and the surface facing the light source 1.1 is formed by painting or printing with a white paint having high scattering and reflection efficiency. ”
- The reflecting plate 7 is configured to reflect the light # of the light guide plate 2: the diffused transmission portion 5.・
, 5, the light that reaches the back side of the light guide plate 2 by passing through the valley diffuser transmission portion 5 is reflected by the reflecting plate 7, and further away from the light source I of the light guide plate 2. It guides you in the direction efficiently. That is, in the portion where the light scattering/reflecting plate 7 and the light diffusing/transmitting section 5 overlap, light not only diffuses in the light diffusing/transmitting section 5 but also passes through the light diffusing/transmitting section 5 . The light passing through the light diffusing and transmitting section 5 is reflected by the light scattering and reflecting plate 7 and enters the light diffusing and transmitting section 5 again. The light scattering/reflecting plate 7 reflects and scatters the light regardless of the incident angle. Therefore, this light passes through the light diffusing and transmitting part 5 from the light diffusing and transmitting part 5 via the light scattering and reflecting plate 7, and a total of 3
Since the light passes through the diffusion and scattering part twice, light is emitted with less loss. This reflecting plate 7 is formed separately from the light guide plate 2 and is arranged so as to overlap the back surface of the light guide plate 2. Therefore, the portion of the light guide plate 2 where the light diffusing and transmitting portion 5 is not formed is prevented from coming into close contact with the light guide plate 2, and at least a slight gap is formed between the portion and the reflecting plate 7.
通常は、上記導光板２としての例えばアクリル板の表面
に拡散フィルムを重ねるだけでよい。尚、北記散乱反射
板７は、上記ケースとは別の板材なとに形成したのち、
これを導光板２の裏面に配置するようにしてらよい。Normally, it is sufficient to simply overlay a diffusion film on the surface of, for example, an acrylic plate as the light guide plate 2. Incidentally, the Hokki scattering reflector plate 7 is formed on a plate material different from the above-mentioned case, and then
This may be arranged on the back surface of the light guide plate 2.
さらに、導光板２の表面全面には、線光源１からの光を
より効率良く散乱させるため、光散乱部を印刷法、転写
法、塗装法、または、コーティング法等にて形成するの
か好ましい。Furthermore, in order to more efficiently scatter the light from the linear light source 1, it is preferable to form a light scattering portion on the entire surface of the light guide plate 2 by a printing method, a transfer method, a painting method, a coating method, or the like.
上記実施例によれば、上記線光源Ｉの下方向より出た光
は、上記散乱反射板７により光拡散板３の表面側に反射
されてその表面から照射される。According to the above embodiment, the light emitted from below the linear light source I is reflected by the scattering reflection plate 7 toward the surface side of the light diffusing plate 3, and is irradiated from the surface.
また、線光源１の上方向より出た光は光拡散板３の裏面
の光吸収部６により均一化された後、光拡散板３の表面
より照射される。また、線光源ｌの横方向すなわちその
長手方向と直交する方向より出た光は、上記導光板２内
を透過して次のように反射される。すなわち、各光源ｌ
の近傍では、上記光源ｌより照射された光のうち大部分
の光か透明導光板内部で入射角と反射角が等しく全反射
を繰り返し、導光板２の中央付近へ導かれる。一方、残
りの光か、面積的には小さい光拡散透過部５゜５て拡散
して直接的にまたは光拡散透過部を透過し、導光板裏面
の白色反射板７で反射して間接的に導光板２の表面側に
導かれ、その表面から照射される。また、ト記光源１か
ら遠い部分ては、大部分の光が面積”的に大きい光拡散
透過部５５で直接または間接的に導光板２の表面側へ導
かれ、その表面から照射される一方、残りの光が導光板
内部で入射角と反射角が等しく全反射を繰り返して導光
板２の側部付近へ導かれる。従って、線光源Ｉより横方
向に照射された光においては、光源近傍の光量の強い部
分の光を上記光源Ｉから遠い部分の光量の弱い部分にロ
スが少なく導くことができ、全体として光のロスが少な
く非常に高輝度で均一な面光源を形成することになる。Further, the light emitted from above the linear light source 1 is made uniform by the light absorbing section 6 on the back surface of the light diffusing plate 3, and then is irradiated from the front surface of the light diffusing plate 3. Further, light emitted from the lateral direction of the linear light source 1, that is, from the direction perpendicular to the longitudinal direction thereof, passes through the light guide plate 2 and is reflected as follows. That is, each light source l
In the vicinity of , most of the light emitted from the light source 1 undergoes total reflection inside the transparent light guide plate with equal angles of incidence and reflection, and is guided to the vicinity of the center of the light guide plate 2 . On the other hand, the remaining light is diffused through the light diffusing and transmitting section 5゜5, which is small in area, and passing through the light diffusing and transmitting section directly or indirectly by being reflected by the white reflecting plate 7 on the back of the light guide plate. The light is guided to the surface side of the light guide plate 2 and irradiated from that surface. In addition, in the part far from the light source 1, most of the light is guided directly or indirectly to the surface side of the light guide plate 2 by the light diffusing and transmitting part 55, which has a large area, and is irradiated from the surface. , the remaining light repeats total reflection inside the light guide plate with an equal angle of incidence and reflection angle, and is guided to the vicinity of the side of the light guide plate 2. Therefore, in the case of light irradiated laterally from the linear light source I, the light emitted near the light source is It is possible to guide the light in the area where the light intensity is strong to the area where the light intensity is weak in the area far from the light source I with less loss, and as a whole, a very high brightness and uniform surface light source is formed with less light loss. .
］−記構成によれば、線光源ｌより出た光を無駄なく全
て利用することにより、装置の厚みが薄くかつ高輝度な
面発光装置が得られる。すなわち、光源ｌから横方向に
照射された光に関しては、アルミニウム蒸着などの鏡面
を利用して光を反射させるのではなく、導光板２の内部
の全反射を利用して光束を変化させるため、光ロスが少
なく非常に高輝度で均一な面光源が得られる。]- According to the configuration described above, by utilizing all the light emitted from the linear light source 1 without wasting it, a surface emitting device with a thin device thickness and high brightness can be obtained. That is, regarding the light emitted in the horizontal direction from the light source 1, the luminous flux is changed using total internal reflection of the light guide plate 2, rather than reflecting the light using a mirror surface such as aluminum vapor deposition. A very high brightness and uniform surface light source with little light loss can be obtained.
なお、本発明は上記実施例に限定されるものではなく、
その他種々の態様で実施できる。例えば、ト記光吸収部
６を上記光拡散板３の裏面に形成する代わりに、上記導
光板２の上面に形成したり、上記光拡散板３の表面に形
成するようにしてもよい。また、第４図に示すように、
導光板２の線光源側に半円状湾曲凹面２ａを形成し、線
光源１の両側に上記湾曲凹面２ａ、２ａを対向するよう
に配置してもよい。この場合には、線光源１から上下に
出るほとんどの光が導光板２内を透過する。また、第５
図に示すように、湾曲凹面２ａの形状を半円状ではなく
湾曲した切欠２ｂのように形成してもよいとともに、−
枚の導光板２の下面に湾曲凹面２ｃを形成し、該湾曲凹
面２ｃ内に上記線光源１を配置するようにしてもよい。Note that the present invention is not limited to the above embodiments,
It can be implemented in various other ways. For example, instead of forming the light absorbing section 6 on the back surface of the light diffusing plate 3, it may be formed on the upper surface of the light guide plate 2 or on the surface of the light diffusing plate 3. Also, as shown in Figure 4,
A semicircular curved concave surface 2a may be formed on the linear light source side of the light guide plate 2, and the curved concave surfaces 2a, 2a may be disposed on both sides of the linear light source 1 so as to face each other. In this case, most of the light emitted vertically from the linear light source 1 passes through the light guide plate 2. Also, the fifth
As shown in the figure, the shape of the curved concave surface 2a may be formed like a curved notch 2b instead of a semicircular shape, and -
A curved concave surface 2c may be formed on the lower surface of the light guide plate 2, and the linear light source 1 may be disposed within the curved concave surface 2c.
これらの場合には、線光源ｌから上方に出た光は導光板
２を透過する。In these cases, the light emitted upward from the linear light source 1 is transmitted through the light guide plate 2.
実例
以ドに面発光１１ｉ′置の具体ρｊを示す。２４０ ｘ
１６５＋ｎｎ＋（厚み２ｍｍ）の光拡散板としての乳
白色アクリル板の裏面にスクリーン印刷法にてアルミニ
ウム・ペーストインキを光吸収部としてドツト状グラデ
ーションにて印１Ｖ１１し、また、透明導光板２４０Ｘ
４５ｍｍ（厚み６ ｍｍ）、２４０Ｘ６５ｍｍ（厚み６
ｍｍ）の裏面にスクリーン印刷法にて光拡散透過部と
してのマントインキのパターンを形成した後、その裏面
に対向して光散乱反射板として白板を配置する。In the following example, concrete ρj of the surface emitting device 11i' is shown. 240x
On the back side of a milky white acrylic plate as a light diffusing plate of 165+nn+ (thickness 2mm), aluminum paste ink was marked with a dot-like gradation as a light absorption part using a screen printing method, and a transparent light guide plate 240X was also printed.
45mm (thickness 6mm), 240X65mm (thickness 6mm)
After forming a pattern of cloak ink as a light-diffusing and transmitting part on the back surface of the sheet (mm) using a screen printing method, a white board is placed opposite the back surface as a light-scattering and reflecting plate.
また、管長２４０ｍｍ、直径５ｍｍの冷陰極管の両側を
挟むように上記透明導光板を配置し、その上部に上記方
法にて形成した光拡散板を配置する。Further, the above transparent light guide plate was arranged so as to sandwich both sides of a cold cathode tube having a tube length of 240 mm and a diameter of 5 mm, and the light diffusing plate formed by the above method was arranged above the transparent light guide plate.
以上のようにして作成した面発光装置は、装置全体の厚
みが８ｍｍという非常に薄くて輝閲も１０００ ｃｄ／
ｎ’以上の均一で高輝度な面発光装置が得られた。The surface emitting device created as described above is extremely thin with an overall thickness of 8 mm, and has a brightness of 1000 cd/
A surface emitting device with uniform and high luminance of n' or more was obtained.
第１．２．３図は夫々本発明の一実施例にかかる面発光
装置を示す断面図、平面図及び線光源と導先板との関係
を示す要部拡大断面図、第４〜６図は線光源と導光板と
の関係を示す要部拡大断面図、第７図は他の実施例にか
かる上記装置の平面図である。
１ 線光源、２・・・導光板、３・・・光拡散板、５・
・光拡散透過部、６・先板収部、７ 光散乱反射板。Figures 1, 2 and 3 are a cross-sectional view and a plan view showing a surface emitting device according to an embodiment of the present invention, an enlarged cross-sectional view of essential parts showing the relationship between a linear light source and a guide plate, and Figures 4 to 6, respectively. FIG. 7 is an enlarged sectional view of a main part showing the relationship between a linear light source and a light guide plate, and FIG. 7 is a plan view of the above device according to another embodiment. 1 Line light source, 2... Light guide plate, 3... Light diffusing plate, 5...
・Light diffusion transmitting section, 6. Front plate housing section, 7. Light scattering reflection plate.
Claims (3)
るとともに該導光体（２）の上方に光拡散板（３）を配
置し、上記光拡散板（３）の下面に、照度分布にほぼ比
例する面積分布を有する光吸収部（６）を形成し、上記
導光体（２）の裏面に上記線光源（１）から遠ざかるに
つれてその面積が次第に大きくなるように光拡散透過部
（５）を形成するとともに、上記導光体（２）の上記光
拡散透過部（５）を形成した裏面に光散乱反射板（７）
を配置するようにしたことを特徴とする面発光装置。(1) A transparent light guide (2) is arranged on both sides of the linear light source (1), and a light diffusing plate (3) is arranged above the light guide (2), and the light diffusing plate (3) is A light absorbing portion (6) having an area distribution approximately proportional to the illuminance distribution is formed on the lower surface, and the area thereof gradually increases as the distance from the linear light source (1) increases on the back surface of the light guide (2). A light scattering/reflecting plate (7) is formed on the back surface of the light guide (2) on which the light diffusing/transmitting part (5) is formed.
A surface light-emitting device characterized in that a.
うにした請求項１に記載の面発光装置。(2) The surface emitting device according to claim 1, wherein a light diffusing portion is formed on the surface of the light guide (2).
プ状に形成された請求項１または２のいずれかに記載の
面発光装置。(3) The surface emitting device according to claim 1 or 2, wherein the diffuse transmission portion (5) is formed in a dot shape or a stripe shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009300A JP2548416B2 (en) | 1990-01-18 | 1990-01-18 | Surface emitting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2009300A JP2548416B2 (en) | 1990-01-18 | 1990-01-18 | Surface emitting device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03214191A true JPH03214191A (en) | 1991-09-19 |
| JP2548416B2 JP2548416B2 (en) | 1996-10-30 |
Family
ID=11716624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2009300A Expired - Fee Related JP2548416B2 (en) | 1990-01-18 | 1990-01-18 | Surface emitting device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2548416B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05303095A (en) * | 1992-04-28 | 1993-11-16 | Fujitsu Ltd | Back light |
| US6883950B2 (en) | 2000-08-31 | 2005-04-26 | Hitachi, Ltd. | Plane-like lighting units and display equipment provided therewith |
| US7267471B2 (en) | 2003-09-19 | 2007-09-11 | Sharp Kabushiki Kaisha | Light guide body, lighting device, liquid crystal display device, and electronic device |
| JP2008166296A (en) * | 2008-03-10 | 2008-07-17 | Sharp Corp | Lighting apparatus |
| JP2008166295A (en) * | 2008-03-10 | 2008-07-17 | Sharp Corp | Lighting apparatus |
| US8177407B2 (en) | 2000-08-31 | 2012-05-15 | Hitachi Displays, Ltd. | Plane-like lighting units and display equipment provided therewith |
| JP2012234830A (en) * | 2008-05-02 | 2012-11-29 | Citizen Electronics Co Ltd | Planar light source, and liquid crystal display device |
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| JPS57128383A (en) * | 1981-02-02 | 1982-08-09 | Mitsubishi Electric Corp | Surface lighting apparatus |
| JPS61145979U (en) * | 1985-03-01 | 1986-09-09 | ||
| JPS6366883U (en) * | 1986-10-21 | 1988-05-06 | ||
| JPH01241590A (en) * | 1988-03-23 | 1989-09-26 | Fujitsu Ltd | Surface lighting device |
| JPH02157791A (en) * | 1988-12-09 | 1990-06-18 | Fujitsu Ltd | Surface illuminating equipment |
| JPH035726A (en) * | 1989-06-02 | 1991-01-11 | Mitsubishi Petrochem Co Ltd | Backlighting device |
-
1990
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57128383A (en) * | 1981-02-02 | 1982-08-09 | Mitsubishi Electric Corp | Surface lighting apparatus |
| JPS61145979U (en) * | 1985-03-01 | 1986-09-09 | ||
| JPS6366883U (en) * | 1986-10-21 | 1988-05-06 | ||
| JPH01241590A (en) * | 1988-03-23 | 1989-09-26 | Fujitsu Ltd | Surface lighting device |
| JPH02157791A (en) * | 1988-12-09 | 1990-06-18 | Fujitsu Ltd | Surface illuminating equipment |
| JPH035726A (en) * | 1989-06-02 | 1991-01-11 | Mitsubishi Petrochem Co Ltd | Backlighting device |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05303095A (en) * | 1992-04-28 | 1993-11-16 | Fujitsu Ltd | Back light |
| US6883950B2 (en) | 2000-08-31 | 2005-04-26 | Hitachi, Ltd. | Plane-like lighting units and display equipment provided therewith |
| US7784986B2 (en) | 2000-08-31 | 2010-08-31 | Hitachi, Ltd. | Plane-like lighting units and display equipment provided therewith |
| US8070344B2 (en) | 2000-08-31 | 2011-12-06 | Hitachi, Ltd. | Plane-like lighting units and display equipment provided therewith |
| US8177407B2 (en) | 2000-08-31 | 2012-05-15 | Hitachi Displays, Ltd. | Plane-like lighting units and display equipment provided therewith |
| US7267471B2 (en) | 2003-09-19 | 2007-09-11 | Sharp Kabushiki Kaisha | Light guide body, lighting device, liquid crystal display device, and electronic device |
| JP2008166296A (en) * | 2008-03-10 | 2008-07-17 | Sharp Corp | Lighting apparatus |
| JP2008166295A (en) * | 2008-03-10 | 2008-07-17 | Sharp Corp | Lighting apparatus |
| JP2012234830A (en) * | 2008-05-02 | 2012-11-29 | Citizen Electronics Co Ltd | Planar light source, and liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2548416B2 (en) | 1996-10-30 |
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