JPH05119311A - Back light - Google Patents
Back lightInfo
- Publication number
- JPH05119311A JPH05119311A JP3278017A JP27801791A JPH05119311A JP H05119311 A JPH05119311 A JP H05119311A JP 3278017 A JP3278017 A JP 3278017A JP 27801791 A JP27801791 A JP 27801791A JP H05119311 A JPH05119311 A JP H05119311A
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent tubes
- diffusion plate
- backlight
- back light
- fluorescent tube
- 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)
- Optical Elements Other Than Lenses (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はバックライトに関するも
のであり、高輝度，低電力，長寿命，超薄型軽量のバッ
クライトを提供するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight, and provides a backlight having high brightness, low power consumption, long life, and ultra-thin weight.
【０００２】[0002]
【従来の技術】パーソナルコンピュータ，ワードプロセ
ッサ，テレビ等の表示画面として液晶パネルが用いられ
ている。この液晶パネルの背面より光を照射し、文字あ
るいは画像を鮮明に表示させる為の補助装置としてバッ
クライトが用いられている。図６に従来のバックライト
の１例を説明する為にバックライトの構造図を示す。2. Description of the Related Art Liquid crystal panels are used as display screens for personal computers, word processors, televisions and the like. A backlight is used as an auxiliary device for illuminating light from the back surface of the liquid crystal panel to display characters or images clearly. FIG. 6 shows a structural diagram of a backlight for explaining an example of a conventional backlight.
【０００３】バックライトは光源となる蛍光管１，光を
拡散させ均一な照光面を作る為の拡散板２，光を有効に
照光面側に集める為の反射板３，拡散板上の輝度を平滑
にする為の網点模様付ライティングカーテン４で本体を
構成し、蛍光管を点灯させる為に交流高電圧をインバー
タ５で発生させ、高耐圧電線６によって蛍光管に電圧を
供給する。A backlight is a fluorescent tube serving as a light source, a diffuser plate for diffusing light to form a uniform illuminated surface, a reflector plate for effectively collecting light on the illuminated surface side, and a brightness on the diffuser plate. The main body is composed of a halftone dot-patterned lighting curtain 4 for smoothing, an AC high voltage is generated by an inverter 5 for lighting the fluorescent tube, and a voltage is supplied to the fluorescent tube by a high voltage wire 6.
【０００４】インバータは通常数１０Ｖ程度の直流電圧
を発振回路に通して交流電圧に変換し、トランス７でこ
れを約１，０００Ｖまで昇圧する。トランスと蛍光管の
間には蛍光管電流を制御する為に高耐圧コンデンサ８を
接続する。The inverter normally converts a direct current voltage of about several tens of volts into an alternating current voltage through an oscillating circuit, and a transformer 7 boosts the voltage to about 1,000 volts. A high voltage capacitor 8 is connected between the transformer and the fluorescent tube to control the fluorescent tube current.
【０００５】カラー液晶パネルに用いられるバックライ
トは拡散板上の輝度が２，０００ｃｄ／ｍ2 程度と高輝
度を要求され、更に輝度むらがなく低消費電力，軽量薄
型が求められる。The backlight used for the color liquid crystal panel is required to have a high luminance of about 2,000 cd / m 2 on the diffusion plate, and further, it is required to have low luminance, low power consumption and light weight.
【０００６】対角線寸法が１０インチ程度のカラー液晶
パネル用のバックライトは、図６に示す様に直径１０ｍ
ｍ前後の蛍光管を２〜６本程度使用し、消費電力が１０
Ｗ，重量が５００ｇ，厚身が２０ｍｍ程度が一般的であ
る。A backlight for a color liquid crystal panel having a diagonal dimension of about 10 inches has a diameter of 10 m as shown in FIG.
Uses about 2 to 6 fluorescent tubes around m and consumes 10
Generally, W, weight is 500 g, and thickness is about 20 mm.
【０００７】輝度を均一にする為に用いるライティング
カーテンの効果を図７に示す。蛍光管に直交する方向に
拡散板上の輝度を測定するとライティングカーテンがな
い場合には点線で示す輝度カーブになる。カーブの頂点
はそれぞれ、蛍光管の真上になる。蛍光管のピッチを狭
くすると、輝度カーブの底の輝度が上昇する傾向があ
る。ライティングカーテンは、透明な樹脂フィルム上の
少なくとも片面に光を遮断あるいは反射する小型の点の
組合せパターンを印刷法、あるいは真空蒸着法で形成し
ている。輝度が高い蛍光管の真上は透過光を制限する為
にパターンを高密度に設計する。この様なライティング
カーテンを拡散板の下に設けることによって輝度カーブ
の頂点輝度を低下させ、均一な照光面を得ることができ
る。The effect of the lighting curtain used to make the brightness uniform is shown in FIG. When the brightness on the diffusion plate is measured in the direction orthogonal to the fluorescent tube, the brightness curve shown by the dotted line is obtained when there is no lighting curtain. The apex of each curve is directly above the fluorescent tube. When the pitch of the fluorescent tube is narrowed, the brightness at the bottom of the brightness curve tends to increase. The lighting curtain is formed by a printing method or a vacuum vapor deposition method on a transparent resin film on at least one surface of which a small dot combination pattern for blocking or reflecting light is formed. Directly above the fluorescent tube with high brightness, the pattern is designed with high density to limit the transmitted light. By providing such a lighting curtain under the diffusion plate, the peak brightness of the brightness curve can be reduced and a uniform illuminated surface can be obtained.
【０００８】また従来のバックライトは図８に示す様に
バックライト本体１に内蔵している各々の蛍光管２とイ
ンベータ３の回路ブロックは対になっており、蛍光管の
本数だけトランスを必要としている。また、電圧を供給
する高耐圧電線は高圧側電線４と低圧側電線５を必要と
し、蛍光管の倍の本数になる。高耐圧電線は３，０００
Ｖ以上の耐圧を必要とすることから、被覆が厚くなる
為、バックライトの構造を検討する際には、電線をはわ
せるスペースの確保を考慮しなければならない。Further, in the conventional backlight, as shown in FIG. 8, the circuit blocks of each fluorescent tube 2 and inbeta 3 built in the backlight body 1 are paired, and as many transformers as there are fluorescent tubes are provided. In need of. Further, the high withstand voltage electric wire for supplying the voltage requires the high voltage side electric wire 4 and the low voltage side electric wire 5, which is twice the number of fluorescent tubes. High voltage wire is 3,000
Since a withstand voltage of V or more is required, the coating becomes thick. Therefore, when considering the structure of the backlight, it is necessary to consider securing a space for inserting the electric wire.
【０００９】蛍光管電流は周波数５０ＫＨｚ程度の微小
電流である為、損失なく電流を供給するには電線長を極
力短かくし、もれ電流を少なくすることが必要である。Since the fluorescent tube current is a minute current having a frequency of about 50 KHz, it is necessary to make the wire length as short as possible and reduce the leakage current in order to supply the current without loss.
【００１０】バックライトを構成する部品の中で最も寿
命が短かいものは蛍光管であり、５ｍＡの電流を流した
場合、寿命は約１０，０００時間である。カラー液晶用
のバックライトは高輝度を必要とする為、通常、蛍光管
電流は５ｍＡ〜１０ｍＡで点灯させている。The fluorescent lamp has the shortest life among the constituent parts of the backlight, and the life is about 10,000 hours when a current of 5 mA is applied. Since the backlight for color liquid crystal requires high brightness, the fluorescent tube current is normally turned on at 5 mA to 10 mA.
【００１１】[0011]
【発明が解決しようとする課題】高輝度，低消費電力，
長寿命，軽量薄型の市場要求に対し、従来のバックライ
トの構造では対応できない問題点があった。SUMMARY OF THE INVENTION High brightness, low power consumption,
There was a problem that the conventional backlight structure could not meet the market demand for long life, light weight and thin shape.
【００１２】[0012]
【課題を解決するための手段】本発明のバックライトは
拡散板の直下に直径４．１ｍｍの細型蛍光管を８本並べ
１つのインバータで点灯させる構造及び点灯方式を備え
ている。The backlight of the present invention is provided with a structure and a lighting system in which eight thin fluorescent tubes having a diameter of 4.1 mm are arranged immediately below a diffusion plate to be turned on by one inverter.
【００１３】[0013]
〔実施例１〕本発明の実施例を図面を用いて説明する。 [Embodiment 1] An embodiment of the present invention will be described with reference to the drawings.
【００１４】図１は本発明の１実施例となるバックライ
トの組立構造図、図２はバックライトの断面図である。FIG. 1 is an assembly structure diagram of a backlight which is an embodiment of the present invention, and FIG. 2 is a sectional view of the backlight.
【００１５】このバックライトは直径４．１ｍｍ，長さ
２３０ｎｍの細型蛍光管を１４ｍｍピッチで８本並べ
た。蛍光管の上方には１．５ｍｍの拡散板、１８８μｍ
のライティングカーテンが備えてある。In this backlight, eight thin fluorescent tubes having a diameter of 4.1 mm and a length of 230 nm were arranged at a pitch of 14 mm. Diffusion plate of 1.5 mm above the fluorescent tube, 188 μm
There is a writing curtain.
【００１６】反射板と蛍光管のギャップを１ｍｍ，反射
板と拡散フィルムのギャップを６ｍｍとした。The gap between the reflector and the fluorescent tube was 1 mm, and the gap between the reflector and the diffusion film was 6 mm.
【００１７】耐衝撃性を考慮した肉厚１．５ｍｍのポリ
カーボネート製の反射板に拡散板、ライティングカーテ
ン，蛍光管を全て内蔵させ、バックライトの総厚９．５
ｍｍと、蛍光管を拡散板の下に配置する直下型バックラ
イトとしては従来にない超薄型に仕上げた。A diffuser plate, a lighting curtain, and a fluorescent tube are all incorporated in a 1.5-mm thick polycarbonate reflection plate in consideration of impact resistance, and the total backlight thickness is 9.5.
mm, and an ultra-thin film, which is not available as a direct type backlight in which a fluorescent tube is arranged under a diffusion plate.
【００１８】このバックライトの平面寸法は光学系機能
部で２６８．９ｍｍ×１３９．８ｍｍとし、対角寸法８
〜９．５インチの液晶パネルに採用できる。インバータ
はバックライト本体の真横に配置できるように小型に製
作した。The planar dimension of this backlight is 268.9 mm × 139.8 mm in the optical system function section, and the diagonal dimension is 8
Can be used for ~ 9.5 inch LCD panel. The inverter was made compact so that it could be placed right next to the backlight unit.
【００１９】〔実施例２〕蛍光管を８本並べたことによ
る高輝度化への効果を図３に示す。[Embodiment 2] FIG. 3 shows the effect of increasing the brightness by arranging eight fluorescent tubes.
【００２０】蛍光管に直交する方向に拡散板上の輝度を
測定すると点線が示す様にライティングカーテンがない
場合でも蛍光管ピッチが、狭いために輝度カーブの底が
大きく低下せず、ライティングカーテンを用いて容易に
高輝度でかつ、輝度の均一性に優れたバックライトを実
現することができた。When the brightness on the diffuser plate is measured in the direction orthogonal to the fluorescent tube, even if there is no lighting curtain as indicated by the dotted line, the bottom of the brightness curve does not greatly decrease because the fluorescent tube pitch is narrow and the lighting curtain is It was possible to easily realize a backlight having high brightness and excellent brightness uniformity.
【００２１】〔実施例３〕低消費電力を実現する為に、
図４に示す構造を製作した。従来、蛍光管とインバータ
が一対になっていたのに対し、８本の蛍光管を並列に接
続し、１つのインバータで点灯させたところ、従来の方
式よりも光変換効率が約２０％上昇した。理由は、イン
バータ内部での損失がトランス１つ分のみで済む為と、
図５に示す様に、電力を蛍光管に供給する高耐圧電線が
バックライト本体に高耐圧コンデンサを内蔵することで
２本で済みようになり、かつ、蛍光管を２枚の基板に半
田付することで高耐圧電線が最短でインバータに接続で
きる構造であることから蛍光管に供給される電流が、途
中で損失することが極めて少ない為である。[Embodiment 3] In order to realize low power consumption,
The structure shown in FIG. 4 was manufactured. Conventionally, a fluorescent tube and an inverter were paired, but when eight fluorescent tubes were connected in parallel and turned on by one inverter, the light conversion efficiency increased by about 20% compared to the conventional method. .. The reason is that the loss inside the inverter is only one transformer.
As shown in Fig. 5, the high withstand voltage wire for supplying electric power to the fluorescent tube can be completed with two by incorporating a high withstand voltage capacitor in the backlight body, and the fluorescent tube is soldered to two substrates. By doing so, the high withstand voltage wire can be connected to the inverter in the shortest time, so that the current supplied to the fluorescent tube is extremely less likely to be lost on the way.
【００２２】〔実施例４〕８本の蛍光管を並列に接続す
ることによって拡散板上の輝度を２，０００ｃｄ／ｍ2
得るのに蛍光管１本当り１．８ｍＡの蛍光管電流で済ん
だ。蛍光管の寿命は流す蛍光管電流の２乗に反比例する
為、５ｍＡで１０，０００時間保証するこの蛍光管の寿
命は推定７７，０００時間まで延ばすことができる。 〔実施例５〕以上の説明したバックライトの性能は、拡
散板上の輝度が２０００ｃｄ／ｍ2 ，消費電力７Ｗ，寿
命約８０，０００時間，重量がインバータを含んで２２
０ｇ，厚み９．５ｍｍを実現し、更に耐衝撃性能が、加
速度１００Ｇに合格することができた。[Embodiment 4] By connecting eight fluorescent tubes in parallel, the brightness on the diffuser plate can be increased to 2,000 cd / m 2.
To obtain it, a fluorescent tube current of 1.8 mA per fluorescent tube was sufficient. Since the life of the fluorescent tube is inversely proportional to the square of the flowing fluorescent tube current, the lifetime of this fluorescent tube, which guarantees 10,000 hours at 5 mA, can be extended to an estimated 77,000 hours. [Embodiment 5] The performance of the backlight described above is as follows: the brightness on the diffuser plate is 2000 cd / m 2 , the power consumption is 7 W, the life is about 80,000 hours, and the weight includes the inverter.
It achieved 0 g and a thickness of 9.5 mm, and the impact resistance was able to pass an acceleration of 100G.
【００２３】[0023]
【発明の効果】以上説明したように本発明によれば拡散
板の直下に直径４．１ｍｍの細型蛍光管を８本並べ、更
にこれらの蛍光管を並列に接続し、１つのインバータで
点灯させることにより薄型高精彩のカラー液晶パネルに
採用する為の高輝度，低消費電力，長寿命，軽量薄型の
緒条件に全て合格することができた。As described above, according to the present invention, eight thin fluorescent tubes having a diameter of 4.1 mm are arranged immediately below the diffuser plate, and these fluorescent tubes are connected in parallel to be turned on by one inverter. As a result, we were able to pass all the requirements for high brightness, low power consumption, long life, and light weight and thinness for use in thin, high-definition color liquid crystal panels.
【００２４】このバックライトの構造は多様化する他の
液晶製品にも充分に応用が可能であり、極めて、優れた
発明である。The structure of this backlight can be sufficiently applied to other diversified liquid crystal products and is an extremely excellent invention.
【図１】発明の一実施例のバックライト組立構造図。FIG. 1 is a diagram of a backlight assembly structure according to an embodiment of the invention.
【図２】図１に示したバックライトの断面図。FIG. 2 is a sectional view of the backlight shown in FIG.
【図３】図１に示したバックライトの拡散板上輝度分布
図。3 is a luminance distribution diagram on the diffusion plate of the backlight shown in FIG.
【図４】図１に示したバックライトの部品結線図。FIG. 4 is a component wiring diagram of the backlight shown in FIG.
【図５】図１に示したバックライトの発光部構造図。5 is a structural diagram of a light emitting portion of the backlight shown in FIG.
【図６】従来のバックライト組立構造図。FIG. 6 is a conventional backlight assembly structure diagram.
【図７】図６で示したバックライトの拡散板上輝度分布
図。7 is a luminance distribution diagram on the diffusion plate of the backlight shown in FIG.
【図８】図６で示したバックライトの部品結線図。FIG. 8 is a component wiring diagram of the backlight shown in FIG.
１ 蛍光管 ２ 拡散板 ３ 反射板 ４ ライティングカーテン ５ インバータ ６ 高耐圧電線 ７ トランス ８ 高耐圧コンデンサ １ バックライト本体 ２ 蛍光管 ３ インバータ ４ 電圧側高耐圧電線 ５ 低圧側高耐圧電線 ６ 高圧側蛍光管取付基板 ７ 低圧側蛍光管取付基板 １ 蛍光管 ２ 高圧側蛍光管取付基板 ３ 低圧側蛍光管取付基板 ４ 高圧側高耐圧電線 ５ 低圧側高耐圧電線 ６ 高耐圧コンデンサ １ 蛍光管 ２ 拡散板３反射板 ４ ライティングカーテン ５ インバータ ６ 高耐圧電線 ７ トランス ８ 高耐圧コンデンサ １ バックライト本体 ２ 蛍光管 ３ インバータ ４ 耐圧側高耐圧電線 ５ 低圧側高耐圧電線 1 Fluorescent Tube 2 Diffuser 3 Reflector 4 Lighting Curtain 5 Inverter 6 High Voltage Wire 7 Transformer 8 High Voltage Capacitor 1 Backlight Body 2 Fluorescent Tube 3 Inverter 4 Voltage High Voltage Wire 5 Low Voltage High Voltage Wire 6 High Voltage Fluorescent Tube Mounting board 7 Low-voltage side fluorescent tube mounting board 1 Fluorescent tube 2 High-voltage side fluorescent tube mounting board 3 Low-voltage side fluorescent tube mounting board 4 High-voltage side high-voltage wire 5 Low-voltage side high-voltage wire 6 High-voltage capacitor 1 Fluorescent tube 2 Diffuser 3 Reflection board Board 4 Lighting curtain 5 Inverter 6 High withstand voltage wire 7 Transformer 8 High withstand voltage capacitor 1 Backlight body 2 Fluorescent tube 3 Inverter 4 Withstand voltage side high withstand voltage wire 5 Low voltage side withstand voltage wire
Claims (2)
ことを特徴とするバックライト。1. A backlight comprising eight thin fluorescent tubes arranged directly below a diffusion plate.
に接続し１つのインバータ回路で、点灯させることを特
徴とするバックライト。2. A backlight characterized in that eight thin fluorescent tubes having a diameter of 4.1 mm are connected in parallel and are turned on by one inverter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3278017A JPH05119311A (en) | 1991-10-24 | 1991-10-24 | Back light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3278017A JPH05119311A (en) | 1991-10-24 | 1991-10-24 | Back light |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05119311A true JPH05119311A (en) | 1993-05-18 |
Family
ID=17591486
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3278017A Pending JPH05119311A (en) | 1991-10-24 | 1991-10-24 | Back light |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05119311A (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002324592A (en) * | 2001-04-26 | 2002-11-08 | Stanley Electric Co Ltd | Connection structure of electrode wire of surface light emitting cold cathode tube |
| WO2004017508A1 (en) * | 2002-08-06 | 2004-02-26 | Sharp Kabushiki Kaisha | Inverter circuit, fluorescent bulb operating device, backlight device, and liquid crystal display device |
| KR100509860B1 (en) * | 2001-12-21 | 2005-08-22 | 미래산업 주식회사 | Sign board using miniature type fluroscent lamps |
| JP2008146050A (en) * | 2006-12-11 | 2008-06-26 | Lg Phillips Lcd Co Ltd | Backlight unit for liquid crystal display device and liquid crystal display module |
| WO2008111253A1 (en) | 2007-03-14 | 2008-09-18 | Sharp Kabushiki Kaisha | Illumination device for display device and display device with the same |
| US7432997B2 (en) | 1999-09-30 | 2008-10-07 | Hitachi, Ltd. | Liquid crystal display device |
| JP2009037996A (en) * | 2007-08-03 | 2009-02-19 | Ming Jong Technologies Co Ltd | Backlight module and its assembling method |
| US7588346B2 (en) | 2002-08-09 | 2009-09-15 | Samsung Electronics Co., Ltd. | Lamp assembly, light supplying apparatus and liquid crystal display device using the same |
| WO2010092716A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Illuminating device for display device, display device and television receiver |
| WO2010092719A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Illuminating device for display device, display device and television receiver |
| WO2010092718A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Lighting device for display device, display device, and television receiver |
| WO2010092717A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Illuminating device for display device, display device and television receiver |
-
1991
- 1991-10-24 JP JP3278017A patent/JPH05119311A/en active Pending
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| WO2004017508A1 (en) * | 2002-08-06 | 2004-02-26 | Sharp Kabushiki Kaisha | Inverter circuit, fluorescent bulb operating device, backlight device, and liquid crystal display device |
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| US7588346B2 (en) | 2002-08-09 | 2009-09-15 | Samsung Electronics Co., Ltd. | Lamp assembly, light supplying apparatus and liquid crystal display device using the same |
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| JP2009037996A (en) * | 2007-08-03 | 2009-02-19 | Ming Jong Technologies Co Ltd | Backlight module and its assembling method |
| WO2010092717A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Illuminating device for display device, display device and television receiver |
| WO2010092718A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Lighting device for display device, display device, and television receiver |
| WO2010092719A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Illuminating device for display device, display device and television receiver |
| WO2010092716A1 (en) * | 2009-02-12 | 2010-08-19 | シャープ株式会社 | Illuminating device for display device, display device and television receiver |
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