JP3356458B2 - Flat light source device - Google Patents
Flat light source deviceInfo
- Publication number
- JP3356458B2 JP3356458B2 JP10638992A JP10638992A JP3356458B2 JP 3356458 B2 JP3356458 B2 JP 3356458B2 JP 10638992 A JP10638992 A JP 10638992A JP 10638992 A JP10638992 A JP 10638992A JP 3356458 B2 JP3356458 B2 JP 3356458B2
- Authority
- JP
- Japan
- Prior art keywords
- light source
- guide plate
- light
- light guide
- source 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.)
- Expired - Fee Related
Links
Landscapes
- Liquid Crystal (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、例えば液晶表示装置
に使用して好適な平面光源装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat light source device suitable for use in, for example, a liquid crystal display device.
【０００２】[0002]
【従来の技術】近年、ワ−ドプロセッサ−，パ−ソナル
コンピュ−タなどの表示装置に透過型あるいは半透過型
の液晶表示装置が多用されている。このような液晶表示
装置における照明方法として、一般に液晶表示板の背面
直下に光源を配設する方法と、液晶表示板の背面直下に
光源を配設しないで液晶表示板の略側面に光源を配設
し、アクリルなどの導光板を用いて面状発光照明を作り
出す方法とが知られている。後者の方法は、例えば特開
昭６１−９９１８７号や特開昭６３−６２１０４号など
に周知の方法である。2. Description of the Related Art In recent years, transmissive or semi-transmissive liquid crystal display devices have been frequently used for display devices such as word processors and personal computers. As a method of illuminating such a liquid crystal display device, a method of arranging a light source directly below the rear surface of the liquid crystal display panel and a method of arranging the light source substantially on the side surface of the liquid crystal display plate without disposing the light source immediately below the rear surface of the liquid crystal display panel are generally used. There is known a method of producing a planar light emitting illumination using a light guide plate made of acrylic or the like. The latter method is a method known in, for example, JP-A-61-99187 and JP-A-63-62104.
【０００３】この後者の平面光源装置は、従来、図４に
示すように構成され、図中の符号１は光を伝達する平板
状の透明な導光板である。この導光板１の４辺の少なく
とも１辺に近接して光源２が設けられ、この光源２を覆
うように反射鏡３が設けられている。更に、導光板１の
一面（出射側）には所定間隔をおいて拡散板４が配設さ
れ、他面（出射側とは反対の面）には複数の反射ドット
５が設けられると共に、所定間隔をおいて反射板６が配
設されている。The latter flat light source device is conventionally configured as shown in FIG. 4, and reference numeral 1 in the drawing denotes a flat transparent light guide plate for transmitting light. A light source 2 is provided near at least one of the four sides of the light guide plate 1, and a reflecting mirror 3 is provided so as to cover the light source 2. Further, a diffusing plate 4 is provided at a predetermined interval on one surface (an emission side) of the light guide plate 1, and a plurality of reflection dots 5 are provided on another surface (an opposite side to the emission side). Reflectors 6 are arranged at intervals.
【０００４】[0004]
【発明が解決しようとする課題】動作時には、光源２か
ら出射した光（矢印）は導光板１の内部を全反射を繰り
返しながら進行するが、この進行する光を反射ドット５
で反射し、導光板１，拡散板４を通して外部に出射させ
ている。ところが、外部に均等に拡散させるために拡散
板４が必要であり、更に反射光を出射方向に戻すために
反射板６も必要であり、構造複雑にして部品点数が多
く、高輝度化，薄形化の実現に支障を来たしていた。こ
の発明は、上記事情に鑑みなされたもので、部品点数を
削減し、構造単純にして高輝度化，薄形化を図った平面
光源装置を提供することを目的とする。In operation, light (arrow) emitted from the light source 2 travels inside the light guide plate 1 while repeating total reflection.
And is emitted to the outside through the light guide plate 1 and the diffusion plate 4. However, the diffusing plate 4 is required to uniformly diffuse the light to the outside, and the reflecting plate 6 is also required to return the reflected light to the emission direction. It was hindering the realization of the shape. SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a planar light source device that has a reduced number of components, a simple structure, and high brightness and a small thickness.
【０００５】[0005]
【課題を解決するための手段】この発明は、光を伝達す
る平板状の透明な導光板と、この導光板の４辺の少なく
とも１辺に近接して設けられた光源と、この光源を覆う
反射鏡とを具備してなる平面光源装置において、上記導
光板の出射側の面と出射側と反対側の面のうち出射側の
面のみに、透明塗料に透明微粒子が混入された複数のド
ット状の透過散乱手段が所定間隔に形成されてなること
を特徴とする平面光源装置である。また、この発明は、
光を伝達する平板状の透明な導光板と、この導光板の４
辺の少なくとも１辺に近接して設けられた光源と、この
光源を覆う反射鏡とを具備してなる平面光源装置におい
て、上記導光板の出射側の面と出射側と反対側の面のう
ち出射側の面のみに、不規則な凹凸で複数のドット状の
透過散乱手段が所定間隔に形成されていることを特徴と
する平面光源装置である。 SUMMARY OF THE INVENTION According to the present invention, there is provided a flat transparent light guide plate for transmitting light, a light source provided near at least one of four sides of the light guide plate, and a cover for the light source. in the planar light source device comprising; and a reflection mirror, only the surface of the exit side of the opposite surface to the surface and the exit side of the exit side of the light guide plate, a plurality of transparent fine particles in the transparent paint is mixed de
That the transmission and scattering means in the form of dots are formed at predetermined intervals.
A flat light source device according to claim. In addition, the present invention
A flat transparent light guide plate for transmitting light;
A light source provided near at least one of the sides;
A flat light source device comprising a reflector for covering the light source;
Between the light-exiting surface and the light-exiting surface of the light guide plate.
Only a plurality of dot-shaped irregular irregularities
Characterized in that the transmission scattering means are formed at predetermined intervals.
This is a flat light source device.
【０００６】[0006]
【作用】この発明によれば、導光板の出射側の面と出射
側と反対側の面のうち出射側の面のみに、透明塗料に透
明微粒子が混入された複数のドット状の透過散乱手段、
または不規則な凹凸で複数のドット状の透過散乱手段が
所定間隔に形成されているので、光が外部に射出するこ
となく散乱特性が向上する。その結果、従来、用いられ
ていた拡散板、反射ドットおよび反射板が不要となり、
部品点数が削減され、構造単純にして高輝度化、薄型化
を図ることが出来る。According to the present invention, only the surface of the light guide plate on the emission side and the surface opposite to the emission side are transparent to the transparent paint.
A plurality of dot-shaped transmission scattering means mixed with bright fine particles ,
Or a plurality of dot-shaped transmission and scattering means with irregular irregularities
Since they are formed at predetermined intervals, the scattering characteristics are improved without emitting light to the outside. As a result, the diffusion plate, reflection dots and reflection plate that have been used conventionally become unnecessary,
The number of parts can be reduced, and the structure can be simplified, and high luminance and thinness can be achieved.
【０００７】[0007]
【実施例】以下、図面を参照して、この発明の一実施例
を詳細に説明する。An embodiment of the present invention will be described below in detail with reference to the drawings.
【０００８】この発明による平面光源装置は図１に示す
ように構成され、従来例（図４）と同一箇所は同一符号
を付すことにする。即ち、図中の符号１は光を伝達する
平板状の透明は導光板である。この導光板１の４辺の少
なくとも１辺に近接して光源２が設けられ、この光源２
を覆うように反射鏡３が設けられている。更に、導光板
１の出射側の面と出射側と反対側の面のうち出射側の面
のみには、光を外部に射出させるための透過散乱手段で
ある複数の透過散乱ドット７が互いに所定の間隔をおい
て形成されている。A flat light source device according to the present invention is configured as shown in FIG. 1, and the same portions as those in the conventional example (FIG. 4) are denoted by the same reference numerals. That is, reference numeral 1 in the drawing denotes a flat transparent light guide plate for transmitting light. A light source 2 is provided near at least one of the four sides of the light guide plate 1.
Is provided so as to cover. Furthermore, a plurality of transmission / scattering dots 7 which are transmission / scattering means for emitting light to the outside are provided only on the emission side surface of the light emission side of the light guide plate 1 and the surface opposite to the emission side. Are formed at intervals.
【０００９】この透過散乱ドット７は、導光板１内部を
全反射で進む光を外部に散乱させれば良いので、具体的
には図２又は図３に示すような構造になっている。即
ち、図２の場合は、導光板１の出射側の面に、透過拡散
材料例えば透明微粒子８が混入された透明塗料９を塗布
して、透過散乱ドット７としており、この透明塗料９の
屈折率は導光板１と同程度である。又、図３の場合は、
導光板１の出射側の面に不規則な凹凸１０を形成して、
透過散乱ドット７としている。尚、各図の矢印は、光源
２から射出した光の進路を示す。The transmission scattering dots 7 have a structure as shown in FIG. 2 or FIG. 3 since the light which propagates inside the light guide plate 1 by total reflection can be scattered to the outside. That is, in the case of FIG. 2, a transparent paint 9 mixed with a transparent diffusion material, for example, transparent fine particles 8, is applied to the emission side surface of the light guide plate 1 to form transmission scattering dots 7, and the transparent paint 9 is refracted. The ratio is almost the same as that of the light guide plate 1. In the case of FIG. 3,
Irregular irregularities 10 are formed on the surface of the light guide plate 1 on the emission side,
The transmission scattering dots 7 are used. Note that the arrows in each figure indicate the path of light emitted from the light source 2.
【００１０】一般に、塗料等を用いる反射拡散材料は顔
料による吸収があるが、透明塗料９に例えばプラスチッ
クやガラス等の透明微粒子８を混入した透過拡散材料は
吸収がなく、同じ入力光量ならば高輝度化が実現出来
る。このような透過拡散材料は透明微粒子８の大きさを
自由に設定出来るため、表面の凹凸を大きく保ち、従っ
て散乱特性を大きく出来る。このような効果は、図３の
凹凸１０を形成して透過散乱ドット７とした場合も、同
様に得られる。勿論、透過散乱ドット７は、図２又は図
３に示したものに限定されないことは言うまでもない。
尚、この実施例では、透過散乱ドット７を設けているの
で、従来のような拡散板，反射ドットおよび反射板は設
けていない。In general, a reflective diffusion material using a paint or the like has an absorption by a pigment, but a transmission diffusion material in which a transparent fine particle 8 such as plastic or glass is mixed in a transparent paint 9 has no absorption. Brightness can be realized. Since the size of the transparent fine particles 8 can be freely set in such a transmission / diffusion material, the surface irregularities can be kept large, and thus the scattering characteristics can be increased. Such an effect is similarly obtained when the unevenness 10 shown in FIG. It goes without saying that the transmission scattering dots 7 are not limited to those shown in FIG. 2 or FIG.
In this embodiment, since the transmission scattering dots 7 are provided, the conventional diffusion plate, reflection dot and reflection plate are not provided.
【００１１】[0011]
【発明の効果】この発明によれば、導光板の出射側の面
に透過散乱手段が互いに所定の間隔をおいて形成されて
いるので、光が外部に射出することなく散乱特性が向上
する。その結果、従来、用いられていた拡散板、反射ド
ットおよび反射板が不要となり、部品点数が削減され、
構造単純にして高輝度化、薄型化を図ることが出来る。According to the present invention, since the transmission and scattering means are formed at a predetermined distance from each other on the light-emitting surface of the light guide plate, the scattering characteristics are improved without light being emitted to the outside. As a result, the diffusion plate and reflection
No need for a kit and reflector, the number of parts is reduced,
The structure can be simplified and high brightness and thinning can be achieved.
【図１】この発明の一実施例に係る平面光源装置を示す
断面図。FIG. 1 is a sectional view showing a flat light source device according to an embodiment of the present invention.
【図２】この発明の平面光源装置における透過散乱手段
の一具体例を示す断面図。FIG. 2 is a cross-sectional view showing a specific example of a transmission / scattering unit in the flat light source device according to the present invention.
【図３】この発明の平面光源装置における透過散乱手段
の他の具体例を示す断面図。FIG. 3 is a sectional view showing another specific example of the transmission scattering means in the flat light source device of the present invention.
【図４】従来の平面光源装置を示す断面図。FIG. 4 is a sectional view showing a conventional flat light source device.
１…導光板、２…光源、３…反射鏡、７…透過散乱ドッ
ト。DESCRIPTION OF SYMBOLS 1 ... Light guide plate, 2 ... Light source, 3 ... Reflection mirror, 7 ... Transmission scattering dot.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭54−143094（ＪＰ，Ａ) 特開 昭58−159517（ＪＰ，Ａ) 特開 平５−196808（ＪＰ，Ａ) 特開 昭52−120797（ＪＰ，Ａ) 実開 昭59−35978（ＪＰ，Ｕ) 実開 平４−27487（ＪＰ，Ｕ) ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-143094 (JP, A) JP-A-58-159517 (JP, A) JP-A-5-196808 (JP, A) JP-A 52-159808 120797 (JP, A) Japanese Utility Model Showa 59-35978 (JP, U) Japanese Utility Model Application Hei 4-27487 (JP, U)
Claims (2)
の導光板の４辺の少なくとも１辺に近接して設けられた
光源と、この光源を覆う反射鏡とを具備してなる平面光
源装置において、 上記導光板の出射側の面と出射側と反対側の面のうち出
射側の面のみに、透明塗料に透明微粒子が混入された複
数のドット状の透過散乱手段が所定間隔に形成されてな
ることを特徴とする平面光源装置。1. A light guide plate for transmitting light, comprising: a transparent light guide plate having a flat plate shape; a light source provided in proximity to at least one of four sides of the light guide plate; and a reflecting mirror covering the light source. In the flat light source device, a plurality of dot-like transmissions in which transparent fine particles are mixed with transparent paint are formed only on the emission side surface of the emission side surface and the opposite side surface of the light guide plate. scatterer flat light source device, characterized in that is formed in a predetermined interval.
の導光板の４辺の少なくとも１辺に近接して設けられた
光源と、この光源を覆う反射鏡とを具備してなる平面光
源装置において、 上記導光板の出射側の面と出射側と反対側の面のうち出
射側の面のみに、不規則な凹凸で複数のドット状の透過
散乱手段が所定間隔に形成されていることを特徴とする
平面光源装置。2. A flat transparent light guide plate for transmitting light.
Provided near at least one of the four sides of the light guide plate.
Planar light comprising a light source and a reflecting mirror covering the light source
In the light source device, the light guide plate has an output side surface and an output side surface opposite to the output side.
Multiple dot-like transmissions with irregular irregularities only on the emission side surface
A flat light source device, wherein scattering means are formed at predetermined intervals .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10638992A JP3356458B2 (en) | 1992-04-24 | 1992-04-24 | Flat light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10638992A JP3356458B2 (en) | 1992-04-24 | 1992-04-24 | Flat light source device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05303092A JPH05303092A (en) | 1993-11-16 |
| JP3356458B2 true JP3356458B2 (en) | 2002-12-16 |
Family
ID=14432345
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10638992A Expired - Fee Related JP3356458B2 (en) | 1992-04-24 | 1992-04-24 | Flat light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3356458B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3521058B2 (en) * | 1998-06-12 | 2004-04-19 | 株式会社エンプラス | Light guide plate, side light type surface light source device and liquid crystal display device |
-
1992
- 1992-04-24 JP JP10638992A patent/JP3356458B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05303092A (en) | 1993-11-16 |
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