JPH03245123A - Panel light source device - Google Patents
Panel light source deviceInfo
- Publication number
- JPH03245123A JPH03245123A JP2041003A JP4100390A JPH03245123A JP H03245123 A JPH03245123 A JP H03245123A JP 2041003 A JP2041003 A JP 2041003A JP 4100390 A JP4100390 A JP 4100390A JP H03245123 A JPH03245123 A JP H03245123A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- light
- tube axis
- diffusing plate
- light receiving
- 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
- 230000004907 flux Effects 0.000 claims abstract description 33
- 239000006185 dispersion Substances 0.000 claims description 28
- 230000007423 decrease Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 4
- 239000012780 transparent material Substances 0.000 abstract description 2
- -1 acryl Chemical group 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000002834 transmittance Methods 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は面光源装置に係り、特に均一な面光源を得るた
めの構造に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a surface light source device, and particularly to a structure for obtaining a uniform surface light source.
山光源装置は、液晶表示素子、アクティブマトリクスを
用いた液晶表示素子等の照明に用いられる。The mountain light source device is used for illuminating a liquid crystal display element, a liquid crystal display element using an active matrix, and the like.
従来、均一な面光源を得ることができる面光源装置とし
て、例えば実開昭６３−１７７８７８号公報に示すもの
が知ら九でいる。この構造は、光源の前方に拡散板が配
設されており、光源と拡散板間に半透過膜が配役さ九て
いる。また光源として放電型のｔ光管を用いるので、中
央部が明るく（輝度が高＜）、両端の電極部分に行くに
従って暗＜ ｆｘる（輝度が低下する）。そこで、前記
半透過膜は、輝度の高い中央部の一部の光を両端部分に
向くように反射する形状と々っている。Conventionally, as a surface light source device capable of obtaining a uniform surface light source, there is one known, for example, as shown in Japanese Utility Model Application Publication No. 177878/1983. In this structure, a diffuser plate is disposed in front of a light source, and a semi-transparent film is placed between the light source and the diffuser plate. Furthermore, since a discharge-type t-light tube is used as a light source, the central part is bright (brightness <fx), and it becomes dark <fx (brightness decreases) toward the electrode portions at both ends. Therefore, the semi-transparent film has a shape that reflects a portion of the light in the central portion where the brightness is high toward both end portions.
上記従来技術は、ｊｔ源として、中央部のｌＩＬ度が高
く、両端の輝度が低い蛍光管を用いた場合には効果があ
る。しかし、光源の管軸に沿った輝度がほぼ均一な、例
えば端部を利用しｔ、Ｈい長い光源を用いた場合には何
ら意味をむさない。即ち、光源の管軸から離れた方向に
ついての輝度σ）均一化の点については伺ら配属がされ
ておらず、上記従来技術によっては拡散板の面全体につ
いて均一に面光源が得られないとＬ・う問題があった。The above-mentioned conventional technology is effective when a fluorescent tube having a high IIL degree at the center and low luminance at both ends is used as the jt source. However, if a long light source with substantially uniform brightness along the tube axis of the light source is used, for example, using the end portion, then this is meaningless. In other words, no consideration has been given to the uniformity of the brightness σ in the direction away from the tube axis of the light source, and it is not possible to obtain a uniform surface light source over the entire surface of the diffuser plate using the above-mentioned conventional technology. L. There was a problem.
本発明の目的は、拡散板の面全体について均一な輝度が
得られる面光源装置を提供することにある。An object of the present invention is to provide a surface light source device that can provide uniform brightness over the entire surface of a diffuser plate.
上記目的を連成するために、光源と受光拡散板間に、光
源の管軸に対応した部分の反射が大きく、管軸より離れ
るに従って透過光が増える形状の光束分散部材を光源の
管軸に沿って設けたものである。In order to achieve the above objectives, a light flux dispersion member is placed between the light source and the light receiving/diffusing plate, and the part corresponding to the tube axis of the light source has a large reflection and the transmitted light increases as the distance from the tube axis increases. It was placed along the line.
光源の管軸上部の光は、殆んど光束分散部材により反射
されて受光拡散板へ透過しｆ、ｃい。この光束分散部材
より反射した光源の管軸上部の光は、光源を収納する容
器自体または容器に設けられた反射板によって、管軸よ
り離れた方向の受光拡散板上へ分散される。また光束分
散部材の形状により、光＃０管軸より離れるに従って光
束分散部材の透過光は増える。この２つの作用により、
光源の管軸より離れた方向における受光拡散面の暗さは
改善される。Most of the light from the upper part of the tube axis of the light source is reflected by the light beam dispersing member and transmitted to the light receiving diffuser plate. The light above the tube axis of the light source reflected from the light flux dispersion member is dispersed onto the light receiving diffuser plate in a direction away from the tube axis by the container itself that houses the light source or a reflecting plate provided on the container. Furthermore, due to the shape of the light flux dispersion member, the amount of light transmitted through the light flux dispersion member increases as the distance from the light #0 tube axis increases. Due to these two effects,
The darkness of the light receiving and diffusing surface in the direction away from the tube axis of the light source is improved.
以下、本発明の一実施例倉第１図及び第２図により説明
する。内＠ＶＣ光源１を収納した反射箱２の上面には受
光拡散板３か配設されている。また光源工と受光拡散板
３間には、アクリルやボリカーボネットなどの透明な材
料よりなる光束分散部材４が光源１の管軸に沿って配設
されている。光束分散部材４の形状は、光源工の管軸に
対応した部分が受光拡散板３０面とほぼ９０°に近い角
度に形成され、光束分散損失４の材餉によって決る臨界
角より犬きくとり、はぼ全反射するようにたっテオリ、
光源１の管軸から離れるに促って受光拡散板３０面に平
行に近づけた曲面状となっている。Hereinafter, one embodiment of the present invention will be explained with reference to FIGS. 1 and 2. A light-receiving diffuser plate 3 is disposed on the upper surface of the reflection box 2 that houses the VC light source 1. Further, a light flux dispersion member 4 made of a transparent material such as acrylic or polycarbonate is arranged between the light source and the light receiving and diffusing plate 3 along the tube axis of the light source 1. The shape of the light flux dispersion member 4 is such that the part corresponding to the tube axis of the light source is formed at an angle close to 90° with the light receiving diffuser plate 30, and the shape is larger than the critical angle determined by the material of the light flux dispersion loss 4. It was just like a total reflection,
The curved surface becomes parallel to the light receiving and diffusing plate 30 as it moves away from the tube axis of the light source 1.
従って、光＠ｒ１の最も明るい管軸の真上における光は
、光束分散部材４により殆んど全反射され、光源工の管
軸に対応した受す拡散板３グ）部分の輝度は減せられる
。また前記０ように光束分散部材４により反射された反
射箱２の斜ｌＴｉ１２ａで反射され、光源１の管軸より
離れた方向の受光拡散板３上に分散される。Therefore, the brightest light @r1 directly above the tube axis is almost completely reflected by the light beam dispersion member 4, and the brightness of the receiving diffuser plate 3) corresponding to the tube axis of the light source is reduced. It will be done. Further, as described above, the light beam is reflected by the light flux dispersing member 4, is reflected by the oblique lTi 12a of the reflection box 2, and is dispersed onto the light receiving diffuser plate 3 in the direction away from the tube axis of the light source 1.
また光束分散部材４は、光＃１の管軸から離れるに従っ
て受光拡散板３に平行に近づいた形状であるので、光源
１の管軸から離れるに従って光束分散部材４の透過光は
多くなり、明るくなる。In addition, the light flux dispersion member 4 has a shape that becomes parallel to the light reception/diffusion plate 3 as it moves away from the tube axis of light #1, so as it moves away from the tube axis of the light source 1, the amount of light transmitted through the light flux dispersion member 4 increases, making it brighter. Become.
これら２つの作用により、受光拡散板３上は、光源１の
管軸に直角な方向においても均一な面輝度が得られる。Due to these two effects, uniform surface brightness can be obtained on the light receiving and diffusing plate 3 even in the direction perpendicular to the tube axis of the light source 1.
また図示の実施例においては、光束分散部材４の幅は、
光ｙ＃１より大きいか、受光拡散板３の下全面にｒｊら
ないように形成されている。これにより、光源１から離
れた受光拡散板３の場所での光束分散部材４による光束
分散損失かべらない。また光束分散部材４と受光拡散板
３０間には空間５を設けている。このように空間５を設
けると、光束分散部材４による光束分散むらの空間拡大
効果が図れ、光束分散部材４の設計容易化及び受光拡散
板３面上の輝度均一化が達成される。In the illustrated embodiment, the width of the light beam dispersion member 4 is
It is larger than the light y#1 or is formed on the entire lower surface of the light receiving and diffusing plate 3 so as not to rj. Thereby, the light flux dispersion loss due to the light flux dispersion member 4 at the location of the light receiving and diffusing plate 3 that is distant from the light source 1 is not increased. Further, a space 5 is provided between the light flux dispersion member 4 and the light receiving and diffusing plate 30. By providing the space 5 in this way, the effect of spatially enlarging the unevenness of the light flux dispersion by the light flux dispersion member 4 can be achieved, and the design of the light flux dispersion member 4 can be facilitated and the brightness on the surface of the light receiving and diffusing plate 3 can be made uniform.
しかしながら、受光拡散板３面上での要求輝度むらレベ
ルが低い場合や、受光拡散板３に拡散効果の高いものと
して透過率の低いもの、もしくは板厚の大きいものが使
える時には、光束分散部材４の効果を高めるために前記
空間５はｆｌ＜でもよい。However, when the required level of luminance unevenness on the surface of the light receiving diffuser plate 3 is low, or when a material with low transmittance or a material with a large plate thickness is used as the light receiving diffuser plate 3 to have a high diffusion effect, the light flux dispersing member 4 In order to enhance the effect, the space 5 may be fl<.
第３図は本発明の第２実施例を示す。本実施例に示す光
束分散部材４１は、平面折曲げの組合せで形成されてい
る。即ち、受光拡散板３面上の輝度むらレベルが低い場
合には、こりよ５ ｆｘ形状でもよい。FIG. 3 shows a second embodiment of the invention. The light flux dispersing member 41 shown in this embodiment is formed by a combination of plane bends. That is, when the level of brightness unevenness on the surface of the light receiving and diffusing plate 3 is low, a 5 fx shape may be used.
第４図は本発明の第３実施例金示す。本実施例に示す光
束分散部材４２は、外面に段差全役けて々る。このよう
な形状にすると、光源１上の光束分散性を大きくするこ
とができる。なお、段差は、光束分散部材４２の内面に
設けてもよく、また凸起または凹み形状でも同様の効果
が得られる。FIG. 4 shows a third embodiment of the present invention. The light beam dispersing member 42 shown in this embodiment has a full step on its outer surface. With such a shape, the light flux dispersion on the light source 1 can be increased. Note that the step may be provided on the inner surface of the light flux dispersion member 42, and the same effect can be obtained even if the step is formed in a convex or concave shape.
ｗ４５図は本発明の第４実施例を示す。本実施例に示す
光束分散部材４３は、すじ状またはマント状もしくは印
刷パターンなどにより光束分散部材４３の光透過性を抑
えたものである。同様Ｖ効果は、拡散板または半透明膜
品を用いても得られる。Figure w45 shows a fourth embodiment of the present invention. The light flux dispersion member 43 shown in this embodiment has a striped shape, a cloak shape, a printed pattern, or the like, so that the light transmittance of the light flux dispersion member 43 is suppressed. A similar V effect can also be obtained using a diffuser plate or a translucent membrane.
第６図は本発明の第５実施例を示す。前記各実施例に示
す光束分散部材４．４１〜４３は、左右対称の形状より
々るが、本実施例に示す光束分散部材４４は、視認方向
６が斜めの場合に最適たまうに、視認方向に傾けた形状
となっている。FIG. 6 shows a fifth embodiment of the invention. Although the light flux dispersion members 4, 41 to 43 shown in each of the above embodiments have a symmetrical shape, the light flux dispersion member 44 shown in this embodiment is most suitable when the viewing direction 6 is oblique. It has a tilted shape.
本発明によれば、光源と受光拡散板間に、光源の管軸に
対応した部分の反射が大きく、管軸より離れるに従って
透過光が増える形状の光束分散部材を光源の管軸に沿っ
て設けてたるので、光源の管軸から離れた方向において
均−ｔｉ面輝度が得られる。According to the present invention, a light flux dispersion member is provided between the light source and the light-receiving diffuser plate along the tube axis of the light source, and the light flux dispersion member has a shape in which reflection is large in a portion corresponding to the tube axis of the light source, and transmitted light increases as the distance from the tube axis increases. Therefore, uniform surface brightness can be obtained in the direction away from the tube axis of the light source.
第１図は本発明の一実施例の面光源装置の斜視図、第２
図は第１図の断面図、１ｇ３図、第４図、第５図、第６
図はそれぞれ本発明の第２、第３、第４、第５実施例の
光束分散部材の断面図である。
１・・・光源、 ３・・・受光拡散板、４．４１〜
４４・・・光束分散部材。
４：虹東哨危邪１Ａ
第
図
ネＱ２認方伺
４１〜４４：
絶東分散部才４FIG. 1 is a perspective view of a surface light source device according to an embodiment of the present invention, and FIG.
The figures are cross-sectional views of Figure 1, Figure 1g3, Figure 4, Figure 5, and Figure 6.
The figures are sectional views of light flux dispersing members according to second, third, fourth, and fifth embodiments of the present invention, respectively. 1... Light source, 3... Light receiving diffuser plate, 4.41~
44...Light flux dispersion member. 4: Nijito Shokija 1A Diagram Ne Q2 Kenhoki 41-44: Zetto Dispersion Department Sai 4
Claims (1)
て、前記光源と前記受光拡散板間に、光源の管軸に対応
した部分の反射が大きく、管軸より離れるに従つて透過
光が増える形状の光束分散部材を光源の管軸に沿つて設
けたことを特徴とする面光源装置。1. In a surface light source device in which a light-receiving diffuser plate is provided in front of the light source, the reflection between the light source and the light-receiving diffuser plate is large at a portion corresponding to the tube axis of the light source, and the transmitted light decreases as the distance from the tube axis increases. A surface light source device characterized in that a light flux dispersion member having an increasing shape is provided along a tube axis of a light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2041003A JPH03245123A (en) | 1990-02-23 | 1990-02-23 | Panel light source device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2041003A JPH03245123A (en) | 1990-02-23 | 1990-02-23 | Panel light source device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03245123A true JPH03245123A (en) | 1991-10-31 |
Family
ID=12596230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2041003A Pending JPH03245123A (en) | 1990-02-23 | 1990-02-23 | Panel light source device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03245123A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006030910A (en) * | 2004-07-21 | 2006-02-02 | Sony Corp | Back light device |
| KR100781699B1 (en) * | 2006-04-19 | 2007-12-03 | 주식회사 나모텍 | Light Guide unit for backlight |
| WO2008035485A1 (en) * | 2006-09-21 | 2008-03-27 | Sharp Kabushiki Kaisha | Backlight unit and liquid crystal display device |
-
1990
- 1990-02-23 JP JP2041003A patent/JPH03245123A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006030910A (en) * | 2004-07-21 | 2006-02-02 | Sony Corp | Back light device |
| KR100781699B1 (en) * | 2006-04-19 | 2007-12-03 | 주식회사 나모텍 | Light Guide unit for backlight |
| WO2008035485A1 (en) * | 2006-09-21 | 2008-03-27 | Sharp Kabushiki Kaisha | Backlight unit and liquid crystal display device |
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