JPH0359526A - Light source unit - Google Patents
Light source unitInfo
- Publication number
- JPH0359526A JPH0359526A JP1194135A JP19413589A JPH0359526A JP H0359526 A JPH0359526 A JP H0359526A JP 1194135 A JP1194135 A JP 1194135A JP 19413589 A JP19413589 A JP 19413589A JP H0359526 A JPH0359526 A JP H0359526A
- Authority
- JP
- Japan
- Prior art keywords
- light source
- transparent substrate
- light
- liquid crystal
- crystal display
- 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
- 239000000758 substrate Substances 0.000 claims abstract description 31
- 238000002834 transmittance Methods 0.000 claims description 3
- 239000004973 liquid crystal related substance Substances 0.000 description 17
- 230000000694 effects Effects 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 210000000988 bone and bone Anatomy 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Landscapes
- Liquid Crystal (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〕
本発明は光源装置に係り、特に背面光源を必要とする液
晶表示装置等の光源装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a light source device, and particularly to a light source device such as a liquid crystal display device that requires a backlight source.
時分割方式やアクティブマトリックス方式の液晶表示装
置は、液晶表示素子の背面側に配置される光源によって
鮮明な表示を得ることができる。A time division type or active matrix type liquid crystal display device can provide a clear display using a light source placed on the back side of a liquid crystal display element.
この液晶表示装置の光源としては、特開昭５１−８８０
４２号公報および特開平１−５７２４０号公報に開示さ
れた技術がある。この技術は、第４図に示すように、液
晶表示素子１のサイズに相当する透明基板２の一端部分
に光源３を配置し、透明基板２の厚さ方向の寸法を縮小
し、薄形に構成することを可能にする。As a light source for this liquid crystal display device, Japanese Patent Application Laid-Open No. 51-880
There are techniques disclosed in Japanese Patent No. 42 and Japanese Patent Application Laid-Open No. 1-57240. As shown in FIG. 4, this technology places a light source 3 at one end of a transparent substrate 2 corresponding to the size of the liquid crystal display element 1, reduces the dimension in the thickness direction of the transparent substrate 2, and makes it thin. Allows you to configure.
この透明基板２は、光透過性が良好な材料で構成し、観
察側（ｇ晶表示素子１側）の−面を平滑面２ａに、対向
する他面な粗面２ｂに構成する。The transparent substrate 2 is made of a material with good light transmittance, and has a smooth surface 2a on the observation side (g-crystal display element 1 side) and a rough surface 2b on the opposite side.
この透明基板２の粗面２ｂは光源３から所定距離離れる
に従って粗面における透明基板の厚さ（以下、粗面の厚
さという）Ｈが薄くなるように傾斜面に形成し、粗面２
ｂ側に設けた反射板４０反射作用と相俟って光源３から
透明基板２内を通過する光の減衰外を平滑面ｚａ側に光
を反射させ、光源３から離れた部分での輝度を高め、均
一な背面光源（以下、面光源という）を得ることを可能
にしている。また液晶表示素子１と透明基板２と成して
いる。The rough surface 2b of the transparent substrate 2 is formed into an inclined surface so that the thickness H of the transparent substrate at the rough surface (hereinafter referred to as the thickness of the rough surface) becomes thinner as the distance from the light source 3 increases by a predetermined distance.
Together with the reflection effect of the reflector plate 40 provided on the b side, the attenuated part of the light passing through the transparent substrate 2 from the light source 3 is reflected to the smooth surface za side, and the brightness at the part away from the light source 3 is reduced. This makes it possible to obtain a high and uniform back light source (hereinafter referred to as a surface light source). Further, it is composed of a liquid crystal display element 1 and a transparent substrate 2.
更に、光源３から離れた部分での輝度の均一性を高める
ために、上記粗面２ｂを連続的な傾斜面に形威し、第５
図に示すごとく、透明基板２人の異なる端面に夫々光源
３Ａを配置し、各光源３Ａから異なる方向に光を通過さ
せ、光源３Ａから最も離れた中央部で透明基板２人の粗
面の厚さが最も薄くなるように構成し、全体として高い
輝度の均一な面光源が得られるようにしている。Furthermore, in order to improve the uniformity of brightness in a portion away from the light source 3, the rough surface 2b is shaped into a continuous slope, and a fifth
As shown in the figure, light sources 3A are placed on different end faces of the two transparent substrates, and light is passed from each light source 3A in different directions, and the thickness of the rough surface of the two transparent substrates is The structure is configured so that the brightness is the thinnest, and a uniform surface light source with high brightness can be obtained as a whole.
上述の従来技術によって、大形の液晶表示素子でも、薄
形で、高い輝度の均一な面光源を得ることが可能になる
。The above-described conventional technology makes it possible to obtain a thin, high-luminance, and uniform surface light source even with a large liquid crystal display element.
しかしながら、複数の光源３Ａ、例えば冷陰極線管を透
明基板２人の異なる端面に夫々配置すると、光源３Ａの
発光に寄与し々い電力損失は、単一の光源におけるそれ
の約２．５倍となる。However, when a plurality of light sources 3A, for example cold cathode ray tubes, are placed on different end faces of two transparent substrates, the power loss that contributes to the light emission of the light sources 3A is approximately 2.5 times that of a single light source. Become.
この電力損失は、冷陰極線管の所要電力の大部が増大し
、液晶温度が上昇し、その光学的変化を起す印加電圧の
しきい値が低下し、液晶表示素子の非点灯領域の一部が
点灯する、いわゆるクロストーク現象が生じ、誤表示や
表示不良が発生し、表示品質を劣化させる原因にｋる場
合がある。This power loss increases most of the power required by the cold cathode ray tube, increases the temperature of the liquid crystal, lowers the threshold of the applied voltage that causes its optical change, and reduces the part of the unlit area of the liquid crystal display element. A so-called cross-talk phenomenon occurs in which the LED lights up, which may lead to erroneous display or display defects, which may lead to deterioration of display quality.
また、複数の光源３Ａを透明基板２人の周囲もしくは隣
り合う端面に連接して配置する場合には、光源３Ａの連
接する部分に無発光部３ Ａ ａが生じ、全体としてそ
の分輝度が低下し、また面光源に暗部が生じる。特に、
液晶表示装置が大形化するので、上述の問題が顕著にな
る。Furthermore, when a plurality of light sources 3A are arranged around two transparent substrates or adjacent end faces, a non-light-emitting area 3A is generated in the part where the light sources 3A are connected, and the overall brightness is reduced accordingly. However, dark areas appear in the surface light source. especially,
As liquid crystal display devices become larger, the above-mentioned problems become more prominent.
本発明の目的は、透明基板の端面に光源を配置する光源
装置において、消費電力を少くして、均一な輝度の面光
源を得ることを可能にする光源装置を提供することにあ
る。SUMMARY OF THE INVENTION An object of the present invention is to provide a light source device in which a light source is disposed on an end surface of a transparent substrate, which can reduce power consumption and provide a surface light source with uniform brightness.
上記の目的は、透明基板の端面に光源を配置し、上記透
明基板の異なる方向に光を通過させるよう構成した光源
装置において、上記光源を単一の光源で構成することに
より達成される。The above object is achieved by configuring the light source as a single light source in a light source device configured to arrange a light source on an end face of a transparent substrate and pass light in different directions of the transparent substrate.
上記の手段によれば、透明基板の端面に配置した光源が
単一にので、発光に寄与しむい電力損失は、複数の光源
を連接配置した場合に比して大巾に低減し、従って、光
源による発熱量が少く、また、光源の連接部分で生じる
無発光部がないので、その分、面光源の輝度が上昇する
。According to the above means, since there is only a single light source disposed on the end surface of the transparent substrate, the power loss that contributes to light emission is greatly reduced compared to the case where a plurality of light sources are arranged in series. Since the amount of heat generated by the light source is small, and there is no non-light-emitting area that occurs at the connecting portion of the light sources, the brightness of the surface light source increases accordingly.
本発明の一実施例になる光源装置を第１図乃至第３図に
示す。なお、同図において、本発明に係る主要九部分、
すなわち、透明基板とその端面に配置する光源について
の斜視図のみを示してその説明を行い、その他の液晶装
置の構成に係る部分は前述の第４図と同一なので、図面
およびその説明は省略する。A light source device according to an embodiment of the present invention is shown in FIGS. 1 to 3. In addition, in the figure, nine main parts related to the present invention,
That is, only a perspective view of the transparent substrate and the light source disposed on the end surface thereof will be shown and explained, and other parts related to the structure of the liquid crystal device are the same as those in FIG. 4 described above, so the drawing and explanation thereof will be omitted. .
第１図は、−面を平滑面に、対向する他面な粗面に構成
した透明基板２Ｂに異々る２方面に光を通過させる場合
の構成を示し、透明基板２Ｂの隣接した端面に単一の光
源３Ｂとして冷陰極線管を配置したものである。FIG. 1 shows a configuration in which light is passed in two different directions through a transparent substrate 2B in which the - side is a smooth surface and the opposite side is a rough surface. A cold cathode ray tube is arranged as a single light source 3B.
このような光源３Ｂは、透明基板２Ｂの角部２Ｂ′で折
り曲げられて配置され、矢視の方向に粗面の厚さが薄く
なるように構成された透明基板に、上記方向に光が通過
し、均一で高輝度の面光源を得ることが可能になる。Such a light source 3B is arranged by being bent at the corner 2B' of the transparent substrate 2B, and the light passes in the above direction through the transparent substrate configured such that the thickness of the rough surface becomes thinner in the direction of the arrow. This makes it possible to obtain a uniform, high-intensity surface light source.
また発光に寄与しない電力損失は、光源を２個使用した
場合に比し約４５％低減でき、それだけ、発光源による
発熱量が減少する。Furthermore, power loss that does not contribute to light emission can be reduced by about 45% compared to when two light sources are used, and the amount of heat generated by the light sources is reduced accordingly.
また、透明基板２Ｂの角部２Ｂ’ で発光部３Ｂが折り
曲げられ、前述のように発光源の連接部がないので、無
発光部による輝度の低下がない。Furthermore, since the light emitting part 3B is bent at the corner 2B' of the transparent substrate 2B and there is no connecting part of the light emitting source as described above, there is no reduction in brightness due to the non-light emitting part.
第２図および第３図は、−面を平滑面に、対向する他面
を粗面に構成した各透明基板２Ｃ１２Ｄの夫々に異なる
３方向、４方向に光を通過させる場合の構成を示し、透
明基板２Ｃ１２Ｄの端面に単一の光源３Ｃ１３Ｄとして
冷陰極線管を配置したものである。FIGS. 2 and 3 show a configuration in which light is passed in three and four different directions through each transparent substrate 2C12D, in which the negative surface is a smooth surface and the opposite surface is a rough surface, respectively, A cold cathode ray tube is arranged as a single light source 3C13D on the end face of the transparent substrate 2C12D.
このような光源３Ｃ１３Ｄは夫々の基板の角部２Ｃ’
２Ｄ’ で折り曲げられて配置され、矢視の方向に
粗面の厚さが薄くなるように構成された透明基板２Ｃ１
２Ｄに上記方向に光が通過し、均一で高輝度の面光源を
得ることが可能になる。Such a light source 3C13D is located at the corner 2C' of each board.
A transparent substrate 2C1 is arranged so as to be bent at 2D', and the thickness of the rough surface becomes thinner in the direction of the arrow.
Light passes in the above direction in 2D, making it possible to obtain a uniform, high-intensity surface light source.
この実施例において、発光に寄与しない電力損失は、第
２図においては、光源を３個使用した場合に比し約６０
％、第３図においては、光源を４個使用した場合に比し
約７０％低減でき、それだけ発光源による発熱量を大巾
に減少させることが可能になる。また、光源の連接部が
ないので、無発光部が生じない点、第１図と同様である
。In this example, the power loss that does not contribute to light emission is approximately 60% compared to when three light sources are used, as shown in Figure 2.
%, as shown in FIG. 3, can be reduced by about 70% compared to the case where four light sources are used, making it possible to greatly reduce the amount of heat generated by the light sources. Also, since there is no connecting part of the light source, there is no non-light emitting part, which is similar to FIG. 1.
以上述べた光源装置は、高い輝度が均一に得られるの特
徴があるので、光透過率の低いスーパーツィステッドネ
マチックタイプの液晶表示素子や、薄膜トランジスタお
よび透明画素電極を有するアクティブマトリックス方式
を採用する液晶表示素子の光源装置に適用して有効であ
るが、液晶表示装置に限定されず、面光源を必要とする
全ての光源装置に適用可能である。The light source devices described above are characterized by the ability to uniformly obtain high brightness, so they use super twisted nematic type liquid crystal display elements with low light transmittance, and liquid crystal display devices that use an active matrix method with thin film transistors and transparent pixel electrodes. Although it is effective when applied to a light source device for a display element, it is not limited to liquid crystal display devices, and can be applied to all light source devices that require a surface light source.
また、上記例れの実施例の光源は、冷陰極線管のほか蛍
光灯等であってもよい。Further, the light source in the above-mentioned example embodiments may be a fluorescent lamp or the like in addition to a cold cathode ray tube.
本発明により、電力損失が少く、かつ高輝度の面光源を
有する表示装置を得ることができる。According to the present invention, a display device having a surface light source with low power loss and high brightness can be obtained.
また、液晶表示装置では、発熱量を大巾に低減させるこ
とができ、無発光部が生じないので、何れも画質向上に
優れた効果がある。In addition, in the liquid crystal display device, the amount of heat generated can be greatly reduced, and no non-light-emitting portions occur, so both have an excellent effect of improving image quality.
第１図乃至第３図は本発明の各実施例を要す要部斜視図
、第４図は液晶表示装置およびその光源装置の要部断面
図、第５図は従来の光源装置を説明するための斜視図で
ある。
１・・・液晶表示素子、
２．２Ａ、２Ｂ、２Ｃ，２Ｄ・・・透明基板、２ａ・・
・平滑面、２ｂ・・・粗面、
３．３Ａ、３Ｂ、３Ｃ，３Ｄ・・・光源、 ４・・・
反射板、 ５・・・拡散板。
第
図
図
：欠品表示素手
２、２Ａ ：迭萌基梳
２０：手５骨面
２ｂ：紙面
３．３Ａ：丸Ａ
４：反１寸才反
５：績耽ｔｉ1 to 3 are perspective views of essential parts of each embodiment of the present invention, FIG. 4 is a sectional view of essential parts of a liquid crystal display device and its light source device, and FIG. 5 illustrates a conventional light source device. FIG. 1...Liquid crystal display element, 2.2A, 2B, 2C, 2D...Transparent substrate, 2a...
・Smooth surface, 2b...Rough surface, 3.3A, 3B, 3C, 3D...Light source, 4...
Reflector plate, 5... Diffusion plate. Diagram: Missing Item Display Bare Hand 2, 2A: 迭茌 20: Hand 5 Bone Surface 2b: Paper Surface 3.3A: Circle A 4: 1-inch size 5: Kei-manti
Claims (1)
する他面を粗面に構成し、このいずれかの粗面の側に反
射板を備え、上記透明基板の端面に光源を配置し、透明
基板の異なる方向に光を通過させるよう構成した光源装
置において、上記光源を単一の光源で構成したことを特
徴とする光源装置。1. One side of a transparent substrate having light transmittance is a smooth surface and the other opposite side is a rough surface, a reflecting plate is provided on either of the rough surfaces, and a light source is arranged on the end surface of the transparent substrate. A light source device configured to transmit light in different directions of a transparent substrate, characterized in that the light source is configured as a single light source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1194135A JPH0359526A (en) | 1989-07-28 | 1989-07-28 | Light source unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1194135A JPH0359526A (en) | 1989-07-28 | 1989-07-28 | Light source unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0359526A true JPH0359526A (en) | 1991-03-14 |
Family
ID=16319491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1194135A Pending JPH0359526A (en) | 1989-07-28 | 1989-07-28 | Light source unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0359526A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0575738U (en) * | 1992-03-16 | 1993-10-15 | 株式会社エンプラス | Surface light source |
| US5967637A (en) * | 1994-08-29 | 1999-10-19 | Enplas Corporation | Tapered light guide plate for surface light source device and method of making by injection molding via supplementary cavity |
-
1989
- 1989-07-28 JP JP1194135A patent/JPH0359526A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0575738U (en) * | 1992-03-16 | 1993-10-15 | 株式会社エンプラス | Surface light source |
| US5967637A (en) * | 1994-08-29 | 1999-10-19 | Enplas Corporation | Tapered light guide plate for surface light source device and method of making by injection molding via supplementary cavity |
| USRE40146E1 (en) * | 1994-08-29 | 2008-03-11 | Enplas Corporation | Tapered light guide plate for surface light source device and method of making by injection molding via supplementary cavity |
| USRE41995E1 (en) | 1994-08-29 | 2010-12-14 | Enplas Corporation | Tapered light guide plate for surface light source device and method of making by injection molding via supplementary cavity |
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