JPH0675217A - Just-under type back light for liquid crystal display device - Google Patents
Just-under type back light for liquid crystal display deviceInfo
- Publication number
- JPH0675217A JPH0675217A JP4228879A JP22887992A JPH0675217A JP H0675217 A JPH0675217 A JP H0675217A JP 4228879 A JP4228879 A JP 4228879A JP 22887992 A JP22887992 A JP 22887992A JP H0675217 A JPH0675217 A JP H0675217A
- Authority
- JP
- Japan
- Prior art keywords
- fluorescent tube
- light
- liquid crystal
- shielding mask
- holding cylinder
- 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
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、液晶表示装置に関し、
特に液晶表示装置用直下型バックライト構造に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device,
In particular, it relates to a direct type backlight structure for a liquid crystal display device.
【０００２】[0002]
【従来の技術】従来の液晶表示装置用バックライトは図
２に示すように液晶パネル４を背面から照射するための
光源である蛍光管２と、蛍光管２から液晶パネル４に対
し背面に出る光を液晶パネル４側に反射させる反射板１
と、蛍光管２から出る光を拡散板３に均一に当てるため
の輝度分散用遮光マスク５を有したライティングカーテ
ン７と、ライティングカーテン７と蛍光管２の距離を一
定に保ちライティングカーテン７を保持するライティン
グカーテン保持棒８とで構成されている。2. Description of the Related Art A conventional backlight for a liquid crystal display device is, as shown in FIG. 2, a fluorescent tube 2 which is a light source for illuminating a liquid crystal panel 4 from the rear side, and the fluorescent tube 2 goes out to the rear side of the liquid crystal panel 4. Reflector 1 that reflects light to the liquid crystal panel 4 side
And a lighting curtain 7 having a light-shielding mask 5 for brightness dispersion for uniformly applying the light emitted from the fluorescent tube 2 to the diffuser plate 3, and keeping the distance between the lighting curtain 7 and the fluorescent tube 2 constant and holding the lighting curtain 7. And a writing curtain holding rod 8 for lighting.
【０００３】次に、動作について説明する。蛍光管２か
ら出た光は、ライティングカーテン７上の輝度分散用遮
光マスク５によって輝度の高い部分を遮光し輝度の低い
部分を透過させ拡散板３上の輝度分布を均一にする。Next, the operation will be described. The light emitted from the fluorescent tube 2 is shielded by the light-shielding mask 5 for luminance dispersion on the lighting curtain 7 to shield the high-luminance portion and to transmit the low-luminance portion to make the luminance distribution on the diffusion plate 3 uniform.
【０００４】[0004]
【発明が解決しようとする課題】この従来の液晶表示装
置用バックライトでは、ライティングカーテン７と蛍光
管２の上端との距離及びライティングカーテン７上の輝
度分散用遮光マスク５と蛍光管２の位置が少しでもずれ
ると、拡散板３上の輝度分布が均一にならないため、蛍
光管２とライティングカーテン７の位置合わせが非常に
困難であった。In this conventional backlight for a liquid crystal display device, the distance between the lighting curtain 7 and the upper end of the fluorescent tube 2 and the positions of the light-shielding mask 5 for brightness dispersion and the fluorescent tube 2 on the lighting curtain 7. If the deviation is even a little, the brightness distribution on the diffusion plate 3 will not be uniform, and it will be very difficult to align the fluorescent tube 2 and the lighting curtain 7.
【０００５】また、反射板１に直接蛍光管２を固定する
ために外力が加わった時、蛍光管２が折れるという問題
点があった。Further, there is a problem that the fluorescent tube 2 breaks when an external force is applied to fix the fluorescent tube 2 directly to the reflector 1.
【０００６】本発明の目的は、蛍光管とマスクとの距離
を一定に保持するようにした液晶表示装置用直下型バッ
クライトを提供することにある。It is an object of the present invention to provide a direct type backlight for a liquid crystal display device in which the distance between the fluorescent tube and the mask is kept constant.
【０００７】[0007]
【課題を解決するための手段】前記目的を達成するた
め、本発明に係る液晶表示装置用直下型バックライト
は、反射板と、蛍光管と、輝度分散用遮光マスクと、拡
散板と、蛍光管保持筒とを有し、液晶パネルを背面から
蛍光管を用いて照射する液晶表示装置用直下型バックラ
イトであって、反射板は、蛍光管保持筒が並べて取付け
られ、蛍光管の光を液晶パネル側に反射するものであ
り、蛍光管は、蛍光管保持筒に内蔵して設けられたもの
であり、輝度分散用遮光マスクは、蛍光管保持筒の周面
に蛍光管と向き合せに設けられ、蛍光管からの光を拡散
板に均一に透過させるものであり、拡散板は、液晶パネ
ルの背面に取付けられ、パネル背面に向けて光を透過す
るものであり、蛍光管保持筒は、拡散板を周面で支持
し、拡散板と輝度分散用遮光マスクと蛍光管との位置関
係を保つものである。In order to achieve the above object, a direct type backlight for a liquid crystal display device according to the present invention is provided with a reflector, a fluorescent tube, a light shielding mask for luminance dispersion, a diffuser, and a fluorescent plate. A direct-type backlight for a liquid crystal display, which has a tube holding tube and irradiates a liquid crystal panel from the back side by using a fluorescent tube, wherein the reflector is mounted with the fluorescent tube holding tubes arranged side by side. It is reflected on the liquid crystal panel side, the fluorescent tube is built in the fluorescent tube holding tube, and the light-shielding mask for brightness dispersion is provided on the peripheral surface of the fluorescent tube holding tube so as to face the fluorescent tube. It is provided to evenly transmit the light from the fluorescent tube to the diffusion plate. The diffusion plate is attached to the back surface of the liquid crystal panel and transmits the light toward the panel back surface. , The diffuser plate is supported by the peripheral surface, and the diffuser plate and the brightness dispersion block It is intended to keep the positional relationship between the mask and the fluorescent tube.
【０００８】[0008]
【作用】蛍光管２は輝度分散用遮光マスク５の付いた蛍
光管保持筒６に内蔵されている。蛍光管と輝度分散用遮
光マスクの距離は常に一定となり、拡散板３には均一の
光が蛍光管から照射される。The fluorescent tube 2 is built in a fluorescent tube holding cylinder 6 having a light-shielding mask 5 for brightness dispersion. The distance between the fluorescent tube and the light-shielding mask for luminance dispersion is always constant, and the diffuser plate 3 is irradiated with uniform light from the fluorescent tube.
【０００９】[0009]
【実施例】以下、本発明の一実施例を図により説明す
る。図１は、本発明の一実施例を示す断面図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention.
【００１０】図１において、反射板１には同一系をもつ
透明な蛍光管保持筒６が複数取付けられている。蛍光管
保持筒６内には、蛍光管２が取付けられている。ここ
に、蛍光管保持筒６の中心軸と蛍光管２の管軸とが一致
するように設置されている。In FIG. 1, a plurality of transparent fluorescent tube holding cylinders 6 having the same system are attached to the reflection plate 1. The fluorescent tube 2 is mounted in the fluorescent tube holding cylinder 6. Here, the fluorescent tube holding cylinder 6 is installed so that the central axis thereof coincides with the tube axis of the fluorescent tube 2.
【００１１】また、保持筒６の周面には、輝度分散用遮
光マスク５が付されている。遮光マスク５は、保持筒６
の反射板１と反対側の周面に設けられている。On the peripheral surface of the holding cylinder 6, a light-shielding mask 5 for luminance dispersion is attached. The light-shielding mask 5 has a holding tube 6
Is provided on the peripheral surface opposite to the reflection plate 1.
【００１２】拡散板３は、保持筒６に支持されており、
拡散板３は遮光マスク５と向き合って設けられている。
拡散板３上には液晶パネル４が設置されている。The diffusion plate 3 is supported by a holding cylinder 6,
The diffusion plate 3 is provided so as to face the light shielding mask 5.
A liquid crystal panel 4 is installed on the diffusion plate 3.
【００１３】蛍光管２から発せられた光は、蛍光管保持
筒６の輝度分散用遮光マスク５により輝度の高い部分が
遮光され、輝度の低い部分が透過されることにより拡散
板３に照射される輝度が均一となる。The light emitted from the fluorescent tube 2 is applied to the diffusing plate 3 by shielding the high-luminance portion and the low-luminance portion by the luminance-dispersion light-shielding mask 5 of the fluorescent-tube holding tube 6. Brightness is uniform.
【００１４】さらに、本発明では、蛍光管２とマスク５
と拡散板３との位置が保持筒６により規定値に保たれ
る。この場合、マスク５と蛍光管２とは保持筒６の内外
径部分を使って設置されるため、その距離が一定とな
る。Further, in the present invention, the fluorescent tube 2 and the mask 5 are
The positions of the diffuser plate 3 and the diffusion plate 3 are maintained at a specified value by the holding cylinder 6. In this case, since the mask 5 and the fluorescent tube 2 are installed by using the inner and outer diameter portions of the holding tube 6, the distance between them is constant.
【００１５】[0015]
【発明の効果】以上説明したように本発明は、蛍光管を
輝度分散用遮光マスク付蛍光管保持筒に内蔵したことに
より輝度分散用遮光マスクと蛍光管の距離が常に一定と
なり輝度バラツキが改善される。蛍光管上端から輝度分
散用遮光マスクの距離が３ｍｍで、上下変動幅を±０．
５ｍｍから±０．２ｍｍにすると、輝度の変動幅が３
３．５％から１２．９％に改善される。As described above, according to the present invention, since the fluorescent tube is built in the fluorescent tube holding cylinder with the light-shielding mask for luminance dispersion, the distance between the light-shielding mask for luminance dispersion and the fluorescent tube is always constant and the variation in luminance is improved. To be done. The distance from the upper edge of the fluorescent tube to the light-shielding mask for luminance dispersion was 3 mm, and the vertical fluctuation range was ± 0.
When it is changed from 5 mm to ± 0.2 mm, the fluctuation range of brightness is 3
It is improved from 3.5% to 12.9%.
【００１６】また、蛍光管が蛍光管保持筒で保護される
ために外力による蛍光管の折れに強いという効果を有す
る。Further, since the fluorescent tube is protected by the fluorescent tube holding cylinder, there is an effect that the fluorescent tube is resistant to breakage due to an external force.
【図１】本発明の一実施例を示す縦断面図である。FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
【図２】従来の液晶表示装置用直下型バックライトを示
す縦断面図である。FIG. 2 is a vertical cross-sectional view showing a conventional direct type backlight for a liquid crystal display device.
１ 反射板 ２ 蛍光管 ３ 拡散板 ４ 液晶パネル ５ 輝度分散用遮光マスク ６ 蛍光管保持筒 ７ ライティングカーテン ８ ライティングカーテン保持棒 1 Reflector 2 Fluorescent Tube 3 Diffuser 4 Liquid Crystal Panel 5 Light-shielding Mask for Luminance Dispersion 6 Fluorescent Tube Holding Tube 7 Lighting Curtain 8 Lighting Curtain Holding Rod
Claims (1)
スクと、拡散板と、蛍光管保持筒とを有し、液晶パネル
を背面から蛍光管を用いて照射する液晶表示装置用直下
型バックライトであって、 反射板は、蛍光管保持筒が並べて取付けられ、蛍光管の
光を液晶パネル側に反射するものであり、 蛍光管は、蛍光管保持筒に内蔵して設けられたものであ
り、 輝度分散用遮光マスクは、蛍光管保持筒の周面に蛍光管
と向き合せに設けられ、蛍光管からの光を拡散板に均一
に透過させるものであり、 拡散板は、液晶パネルの背面に取付けられ、パネル背面
に向けて光を透過するものであり、 蛍光管保持筒は、拡散板を周面で支持し、拡散板と輝度
分散用遮光マスクと蛍光管との位置関係を保つものであ
ることを特徴とする液晶表示装置用直下型バックライ
ト。1. Directly under a liquid crystal display device, which has a reflection plate, a fluorescent tube, a light-shielding mask for brightness dispersion, a diffusion plate, and a fluorescent tube holding cylinder, and which illuminates the liquid crystal panel from the back side using the fluorescent tube. The backlight is a type backlight in which fluorescent tube holding tubes are mounted side by side and reflects the light of the fluorescent tubes to the liquid crystal panel side. The fluorescent tube is built in the fluorescent tube holding tube. The light-shielding mask for luminance dispersion is provided on the peripheral surface of the fluorescent tube holding tube so as to face the fluorescent tube, and allows the light from the fluorescent tube to evenly pass through the diffuser plate. It is attached to the back of the panel and transmits light toward the back of the panel.The fluorescent tube holding tube supports the diffuser plate on the peripheral surface, and the positional relationship between the diffuser plate, the light-shielding mask for brightness dispersion, and the fluorescent tube. A direct type bag for a liquid crystal display device characterized in that Light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4228879A JP2826425B2 (en) | 1992-08-27 | 1992-08-27 | Direct backlight for liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4228879A JP2826425B2 (en) | 1992-08-27 | 1992-08-27 | Direct backlight for liquid crystal display |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0675217A true JPH0675217A (en) | 1994-03-18 |
| JP2826425B2 JP2826425B2 (en) | 1998-11-18 |
Family
ID=16883298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4228879A Expired - Lifetime JP2826425B2 (en) | 1992-08-27 | 1992-08-27 | Direct backlight for liquid crystal display |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2826425B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6864930B2 (en) * | 1998-04-01 | 2005-03-08 | Yazaki Corporation | Liquid crystal display device |
| JP2009042259A (en) * | 2007-08-06 | 2009-02-26 | Sharp Corp | Backlight fluorescent tube exchange mechanism |
| US7855760B2 (en) * | 2007-09-07 | 2010-12-21 | Hitachi, Ltd. | Liquid crystal display apparatus |
-
1992
- 1992-08-27 JP JP4228879A patent/JP2826425B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6864930B2 (en) * | 1998-04-01 | 2005-03-08 | Yazaki Corporation | Liquid crystal display device |
| JP2009042259A (en) * | 2007-08-06 | 2009-02-26 | Sharp Corp | Backlight fluorescent tube exchange mechanism |
| US7855760B2 (en) * | 2007-09-07 | 2010-12-21 | Hitachi, Ltd. | Liquid crystal display apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2826425B2 (en) | 1998-11-18 |
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