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JPH08179318A - Illuminating device for liquid crystal - Google Patents

Illuminating device for liquid crystal

Info

Publication number
JPH08179318A
JPH08179318A JP6325474A JP32547494A JPH08179318A JP H08179318 A JPH08179318 A JP H08179318A JP 6325474 A JP6325474 A JP 6325474A JP 32547494 A JP32547494 A JP 32547494A JP H08179318 A JPH08179318 A JP H08179318A
Authority
JP
Japan
Prior art keywords
liquid crystal
light source
light
display panel
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.)
Granted
Application number
JP6325474A
Other languages
Japanese (ja)
Other versions
JP3086609B2 (en
Inventor
Kazuya Minami
和也 南
Takahiro Katayama
隆浩 片山
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sharp Corp
Original Assignee
Sharp Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sharp Corp filed Critical Sharp Corp
Priority to JP06325474A priority Critical patent/JP3086609B2/en
Publication of JPH08179318A publication Critical patent/JPH08179318A/en
Application granted granted Critical
Publication of JP3086609B2 publication Critical patent/JP3086609B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Liquid Crystal (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE: To uniformize the luminance distribution of a large-sized liquid crystal panel by reflecting light radiated from a 1st light source in the luminance distribution of the 1st light source by a 2nd reflector. CONSTITUTION: Plural 1st fluorescent lamps 2 are disposed in parallel with the liquid crystal display panel 1 just under the panel 1 by leaving a fixed space, a diffusion plate is provided in parallel with the panel 1 between the panel 1 and the 1st lamp 2, 1st reflectors 5a having mutually the same shape are disposed in accordance with the number of the 1st lamps 2 under the lamp 2 by leaving a fixed space from the lamp 2, a 2nd fluorescent lamp 4 having different luminance from the lamp 2 is provided in the center between the lamps 2 just under the diffusion plate 3, and the 2nd reflector 5b refecting the light radiated from the 2nd lamp 4 in the luminance distribution of the lamp 2 to make the luminance distribution uniform, is disposed under the lamp 4 by leaving the fixed space from the lamp 4.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、液晶表示パネルを真下
から照射するバックライトに関し、特に液晶表示パネル
に照射する輝度分布を均一にする液晶用照明装置に関す
るものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight for illuminating a liquid crystal display panel from directly below, and more particularly to a liquid crystal illuminating device for uniforming the luminance distribution for illuminating the liquid crystal display panel.

【0002】[0002]

【従来の技術】従来、この種の液晶用照明装置は図9に
示すように構成するものであり、図9において、液晶表
示パネル11の真下に縦断面が円状の蛍光灯12を複数
(図9では3本)液晶表示パネル11に対して平行に一
定間隔空けて配設し、該蛍光灯12から照射する光を液
晶表示パネル11側に反射する反射板13を蛍光灯12
の真下から覆うように設け、上記液晶表示パネル11と
蛍光灯12との間に蛍光灯12からの光を拡散する拡散
板14を液晶表示パネルに対して平行に一定間隔を空け
て配設している。
2. Description of the Related Art Conventionally, this type of liquid crystal lighting device is constructed as shown in FIG. 9, and in FIG. 9, a plurality of fluorescent lamps 12 each having a circular vertical cross section are provided just below a liquid crystal display panel 11. In FIG. 9, three fluorescent lamps are provided in parallel with the liquid crystal display panel 11 at regular intervals, and a reflector 13 for reflecting the light emitted from the fluorescent lamp 12 toward the liquid crystal display panel 11 side is provided.
And a diffuser plate 14 for diffusing light from the fluorescent lamp 12 is provided between the liquid crystal display panel 11 and the fluorescent lamp 12 in parallel with the liquid crystal display panel at a constant interval. ing.

【0003】そして、上記蛍光灯12は、最外側の蛍光
灯12aと内側の蛍光灯12bとから構成されており、
液晶表示パネル11に照射する光の輝度分布を均一にす
るために、最外側の蛍光灯12aは内側の蛍光灯12b
より径を小さくして光の指向性を持たせるか、または、
最外側の蛍光灯12aは内側の蛍光灯12bより蛍光灯
12に流れる電流を増やしている。
The fluorescent lamp 12 is composed of an outermost fluorescent lamp 12a and an inner fluorescent lamp 12b.
In order to make the brightness distribution of the light applied to the liquid crystal display panel 11 uniform, the outermost fluorescent lamp 12a is the inner fluorescent lamp 12b.
Make the diameter smaller to give light directivity, or
The outermost fluorescent lamp 12a increases the current flowing through the fluorescent lamp 12 more than the inner fluorescent lamp 12b.

【0004】また、上記拡散板14には、蛍光灯12の
輝度分布の高い箇所を輝度分布の低い箇所に合わせるよ
うに遮蔽して輝度分布を均一にする拡散シート(図示せ
ず)を有している。
The diffusing plate 14 has a diffusing sheet (not shown) for shielding the fluorescent lamp 12 from a portion having a high luminance distribution so as to match a portion having a low luminance distribution to make the luminance distribution uniform. ing.

【0005】上記のように構成してなる液晶用表示装置
は、蛍光灯12にて光を照射し、その照射した光の一部
は反射板13により液晶表示パネル11側に反射し、そ
の反射する光と蛍光灯12から照射した光とを拡散板1
4にて反射し、液晶表示パネル11側に照射する。
The liquid crystal display device constructed as described above irradiates the fluorescent lamp 12 with light, and a part of the radiated light is reflected by the reflector 13 toward the liquid crystal display panel 11 side. The diffusing plate 1 for irradiating light and the light emitted from the fluorescent lamp 12.
It is reflected at 4 and is irradiated to the liquid crystal display panel 11 side.

【0006】そして、輝度分布のむらをなくすために、
輝度分布の高い箇所は輝度分布が低い箇所に合わせるよ
うに拡散シートにて遮蔽して輝度分布のむらをなくし、
またさらに、内側の蛍光灯12bの輝度分布は最外側の
蛍光灯12aからの一部の光が照射されるので、最外側
の蛍光灯12aより輝度分布は高くなり、そのため、最
外側の蛍光灯12aの径を小さくして光の指向性を持た
せたり、最外側の蛍光灯12aに流れる電流を増やした
りして、最外側の蛍光灯12aから照射する光を強くし
て、蛍光灯12から液晶表示パネル1に照射する光の輝
度分布を均一にするものである。
And, in order to eliminate the unevenness of the luminance distribution,
Places with high luminance distribution are covered with a diffusion sheet to match with places with low luminance distribution, eliminating unevenness in luminance distribution,
Furthermore, the brightness distribution of the inner fluorescent lamp 12b is higher than that of the outermost fluorescent lamp 12a because a part of the light from the outermost fluorescent lamp 12a is emitted, and therefore, the brightness distribution of the outermost fluorescent lamp 12a is higher. By reducing the diameter of 12a to give light directivity, or by increasing the current flowing through the outermost fluorescent lamp 12a, the light radiated from the outermost fluorescent lamp 12a is strengthened so that the fluorescent lamp 12 The luminance distribution of the light applied to the liquid crystal display panel 1 is made uniform.

【0007】[0007]

【発明が解決しようとする課題】しかしながら、上記の
ように構成してなる液晶用照明装置は、夫々の蛍光灯1
2の輝度分布は真上に湾曲状に形成されるので、夫々の
蛍光灯12間の輝度分布は多少輝度むらが生じる。特に
大型の液晶表示パネルを用いるに連れて蛍光灯12の本
数が増えるので、夫々の蛍光灯12間で生じる輝度むら
が増え、表示品位が低下するという問題点があった。
However, the liquid crystal lighting device configured as described above is provided with each fluorescent lamp 1.
Since the luminance distribution of No. 2 is formed in a curved shape right above, the luminance distribution between the respective fluorescent lamps 12 has some luminance unevenness. In particular, since the number of fluorescent lamps 12 increases as a large-sized liquid crystal display panel is used, there is a problem in that the uneven brightness generated between the fluorescent lamps 12 increases and the display quality deteriorates.

【0008】そのため、液晶表示パネル11に照射する
光の輝度を押さえて輝度分布を均一にする通常0.2
〔mm〕程度の拡散シートが用いられるが、拡散シート
は輝度分布の高い箇所を輝度分布の低い箇所に合わせる
ようにしているので、蛍光灯12から液晶表示パネルに
照射する光の輝度分布が低下する。また、大型の液晶パ
ネルに用いる拡散シートはその面積が大きいにもかかわ
らず、拡散シートは薄いため、自重によりたわみが生
じ、たわみにより拡散効果が低下するとともに、装置全
体の重さ及びコストが増大するという問題点があった。
Therefore, the brightness of the light radiated to the liquid crystal display panel 11 is suppressed to make the brightness distribution uniform 0.2.
Although a diffusion sheet of about [mm] is used, since the diffusion sheet is arranged so that a portion having a high luminance distribution is aligned with a portion having a low luminance distribution, the luminance distribution of the light emitted from the fluorescent lamp 12 to the liquid crystal display panel is lowered. To do. Moreover, since the diffusion sheet used for a large-sized liquid crystal panel has a large area, the diffusion sheet is thin, so that the diffusion sheet is bent due to its own weight, the diffusion effect is reduced due to the deflection, and the weight and cost of the entire device are increased. There was a problem to do.

【0009】本発明の液晶用照明装置は上記のような問
題点を解決したもので、大型の液晶パネルに用いても光
源間で生じる輝度むらが増加することなく、光源から液
晶表示パネルに照射する光の輝度分布を均一にすること
ができ、表示品位の低下を防止することができる。しか
も、拡散シートを用いることにより生じる装置全体の重
さ及びコストの増大、輝度分布の低下を防止することが
できる液晶用照明装置を提供することを目的とするもの
である。
The liquid crystal lighting device of the present invention solves the above-mentioned problems. Even when it is used for a large liquid crystal panel, the unevenness of brightness generated between the light sources does not increase and the liquid crystal display panel is irradiated with light. It is possible to make the luminance distribution of the light to be uniform and prevent the display quality from deteriorating. Moreover, it is an object of the present invention to provide a liquid crystal lighting device capable of preventing an increase in the weight and cost of the entire device and a decrease in the luminance distribution caused by using the diffusion sheet.

【0010】[0010]

【課題を解決するための手段】上記目的を達成するため
に本発明の液晶用照明装置は、請求項1記載の発明は、
液晶表示パネルに対して平行に複数の第1の光源を一定
間隔空けて液晶表示パネルの真下に配設し、該液晶表示
パネルと第1の光源との間に拡散板を液晶表示パネルに
対して平行に設け、該第1の光源の下方に第1の光源の
数に応じて同一形状の第1の反射板を第1の光源に対し
て一定間隔空けて配設し、上記拡散板の真下の第1の光
源間の中央に第1の光源と異なる輝度の第2の光源を設
け、該第2の光源から照射する光を上記第1の光源の輝
度分布間に反射させて輝度分布を均一にする第2の反射
板を第2の光源に対して下方に一定間隔空けて配設して
なるものである。
In order to achieve the above-mentioned object, the liquid crystal lighting device of the present invention comprises:
A plurality of first light sources are arranged parallel to the liquid crystal display panel at regular intervals below the liquid crystal display panel, and a diffusion plate is provided between the liquid crystal display panel and the first light source with respect to the liquid crystal display panel. Parallel to each other, and a first reflection plate having the same shape is arranged below the first light sources in accordance with the number of the first light sources with a constant interval with respect to the first light sources. A second light source having a brightness different from that of the first light source is provided in the center between the first light sources directly below, and the light emitted from the second light source is reflected between the brightness distributions of the first light source to provide a brightness distribution. The second reflection plate that makes the light uniform is disposed below the second light source with a constant space.

【0011】そして請求項2記載の発明は、上記請求項
1記載の発明において、上記第2の光源を少なくとも第
1の光源より液晶表示パネル側に配設してなるものであ
る。
According to a second aspect of the present invention, in the first aspect of the present invention, the second light source is arranged at least on the liquid crystal display panel side of the first light source.

【0012】また請求項3記載の発明は、上記請求項1
記載の発明において、上記拡散板を、光を拡散する光拡
散板と、熱を遮蔽する熱遮蔽板とで形成してなるもので
ある。
The invention according to claim 3 is the above-mentioned claim 1.
In the invention described above, the diffusion plate is formed of a light diffusion plate for diffusing light and a heat shielding plate for shielding heat.

【0013】さらに請求項4記載の発明は、上記請求項
1記載の発明において、上記第2の光源の縦断面を楕円
状に形成し、該楕円の長手方向を上記液晶表示パネルに
対して垂直に向けて第2の光源を配設してなるものであ
る。
According to a fourth aspect of the present invention, in the first aspect of the present invention, the second light source has an elliptical longitudinal section, and the longitudinal direction of the ellipse is perpendicular to the liquid crystal display panel. The second light source is arranged toward the.

【0014】しかも請求項5記載の発明は、上記請求項
3記載の発明において、上記光拡散板と熱遮蔽板との間
に空気層を形成してなるものである。
Further, the invention according to claim 5 is the invention according to claim 3, wherein an air layer is formed between the light diffusion plate and the heat shield plate.

【0015】[0015]

【作用】本発明は上記構成にて、請求項1記載の発明
は、第2の反射板にて第1の光源の輝度分布間に第1の
光源から照射する光を反射させることより、大型の液晶
パネルに用いても光源間で生じる輝度むらが増加するこ
となく、光源から液晶表示パネルに照射する光の輝度分
布を均一にすることができ、表示品位が低下するのを防
止することができる。
The present invention has the above-described structure, and the invention according to claim 1 is large in size by reflecting the light emitted from the first light source between the luminance distributions of the first light source by the second reflecting plate. Even if it is used for the liquid crystal panel, it is possible to make uniform the luminance distribution of the light emitted from the light source to the liquid crystal display panel without increasing the unevenness in the brightness generated between the light sources, and to prevent the display quality from being degraded. it can.

【0016】しかも、拡散シートを用いることなく輝度
分布を均一にすることができるので、拡散シートを用い
ることにより生じる装置全体の重さ及びコストの増大、
輝度分布の低下を防止することができる。
Moreover, since the luminance distribution can be made uniform without using the diffusion sheet, the weight and cost of the entire apparatus, which are increased by using the diffusion sheet, are increased.
It is possible to prevent deterioration of the brightness distribution.

【0017】そして請求項2記載の発明は、上記請求項
1記載の構成において、第2の光源を少なくとも第1の
光源より液晶表示パネル側に配設することにより、液晶
表示パネルと第2の光源との間隔が第1の光源よりも短
くなるので、第1の光源よりも小さい輝度の光源を用い
ることができて、消費電力量を低減させることができ
る。
According to a second aspect of the present invention, in the structure according to the first aspect, the second light source is disposed at least on the liquid crystal display panel side of the first light source, so that the liquid crystal display panel and the second light source are provided. Since the distance from the light source is shorter than that of the first light source, it is possible to use a light source having a brightness smaller than that of the first light source, and it is possible to reduce power consumption.

【0018】また請求項3記載の発明は、上記請求項1
記載の構成において、光拡散板により第1の光源及び第
2の光源からの光を拡散するとともに、第1の光源及び
第2の光源から照射する光の熱が液晶表示パネルに伝わ
るのを熱遮蔽板にて遮蔽することにより、輝度分布を均
一にしながら第1の光源及び第2の光源からの熱影響を
受けないようにして、照明装置の信頼性を向上させるこ
とができる。
The invention according to claim 3 is the above-mentioned claim 1.
In the structure described above, the light from the first light source and the second light source is diffused by the light diffusing plate, and the heat of the light emitted from the first light source and the second light source is transmitted to the liquid crystal display panel. By shielding with the shielding plate, it is possible to improve the reliability of the lighting device by making the luminance distribution uniform and not being influenced by heat from the first light source and the second light source.

【0019】さらに請求項4記載の発明は、上記請求項
1記載の構成において、第2の光源の縦断面を楕円状に
形成し、該楕円の長手方向を液晶表示パネルに対して垂
直に向けて第2の光源を配設することにより、第2の光
源に光の指向性を持たせ、且つ第2の光源の径を小さく
することで耐熱の問題により第2の光源に流れる電流に
制約されることがない。
According to a fourth aspect of the present invention, in the structure of the first aspect, the second light source is formed in an elliptical longitudinal section, and the ellipse is oriented with its longitudinal direction perpendicular to the liquid crystal display panel. By disposing the second light source as a light source, the second light source has a directivity of light, and the diameter of the second light source is reduced, so that the current flowing through the second light source is restricted due to heat resistance. Never be done.

【0020】しかも請求項5記載の発明は、上記請求項
3記載の構成において、光拡散板と熱遮蔽板との間に空
気層を形成することにより、第1の光源及び第2の光源
から放射する光の熱が液晶表示パネルに伝わるを空気層
の断熱効果により遮断するので、さらに照明装置の信頼
性を向上させることができる。
Further, in the invention according to claim 5, in the structure according to claim 3, by forming an air layer between the light diffusion plate and the heat shield plate, the first light source and the second light source are separated. Since the heat of the emitted light is blocked from being transmitted to the liquid crystal display panel by the heat insulating effect of the air layer, the reliability of the lighting device can be further improved.

【0021】[0021]

【実施例】以下、本発明の液晶用照明装置の実施例を図
1乃至図6と共に詳細に説明する。本発明の液晶用照明
装置の第1の実施例は図1及び図4に示すように構成す
るものであり、図1及び図3において、矩形状若しくは
正方形状の液晶表示パネル1の真下に第1の光源である
第1の蛍光灯2を液晶表示パネル1に対して平行に一定
間隔を空けて配設し、該液晶表示パネル1と第1の蛍光
灯2との間にアクリル樹脂で構成された拡散板3を液晶
表示パネル1に対して平行に一定間隔を空けて設け、該
拡散板3の真下の第1の蛍光灯2間の中央に第1の蛍光
灯2より輝度が低い第2の光源である第2の蛍光灯4を
設け、上記蛍光灯2、4の真下にアルミ板若しくはプラ
スッチック樹脂で構成された反射板5を一定間隔を空け
て形成してなるものである。
Embodiments of the liquid crystal lighting device of the present invention will be described in detail below with reference to FIGS. A first embodiment of the liquid crystal lighting device according to the present invention is configured as shown in FIGS. 1 and 4, and in FIGS. 1 and 3, it is directly below the rectangular or square liquid crystal display panel 1. A first fluorescent lamp 2 as a first light source is arranged in parallel with the liquid crystal display panel 1 at a constant interval, and is made of an acrylic resin between the liquid crystal display panel 1 and the first fluorescent lamp 2. The diffuser plates 3 are provided in parallel with the liquid crystal display panel 1 at regular intervals, and in the center between the first fluorescent lamps 2 directly below the diffuser plate 3, the brightness of the first fluorescent lamp 2 is lower than that of the first fluorescent lamp 2. A second fluorescent lamp 4 serving as a second light source is provided, and a reflecting plate 5 made of an aluminum plate or plastic resin is formed directly below the fluorescent lamps 2 and 4 at regular intervals.

【0022】上記第1の蛍光灯2は、直径12〔m
m〕、長さ470〔mm〕、輝度20000〔nt〕の
ものを使用し、該第1の蛍光灯2の中心から中心までの
夫々の間隔は51〔mm〕である。
The first fluorescent lamp 2 has a diameter of 12 [m
m], a length of 470 [mm], and a brightness of 20000 [nt], and the distance between the centers of the first fluorescent lamps 2 is 51 [mm].

【0023】上記第2の蛍光灯4は、直径12〔m
m〕、長さ470〔mm〕、輝度15000〔nt〕の
ものを使用し、該第1の蛍光灯2の中心から第2の蛍光
灯4の中心までの夫々の間隔は25.5〔mm〕で、そ
こから液晶表示パネル1に対して垂直方向に該液晶表示
パネル1側に向かって上記第1の蛍光灯2の中心から夫
々10〔mm〕ずれた位置に第2の蛍光灯4の中心が位
置するように配設されている。
The second fluorescent lamp 4 has a diameter of 12 [m
m], a length of 470 [mm] and a brightness of 15000 [nt], and the distance between the center of the first fluorescent lamp 2 and the center of the second fluorescent lamp 4 is 25.5 [mm]. ] Then, from the center of the first fluorescent lamp 2 toward the liquid crystal display panel 1 side in the direction perpendicular to the liquid crystal display panel 1, the second fluorescent lamp 4 is displaced at a position 10 mm from the center of the first fluorescent lamp 2, respectively. It is arranged so that the center is located.

【0024】また、上記拡散板3は特に図2に示すよう
に、上に光を拡散する光拡散板3aと、下に蛍光灯2、
4からの熱が液晶表示パネル1に伝わるのを遮蔽する熱
遮蔽板3bとから構成し、該光拡散板3aの厚みは2
〔mm〕、熱遮蔽板3bの厚みは2〔mm〕であり、該
光拡散板3aと熱遮蔽板3bとの間隔を0.5〔mm〕
空けて空気層6を形成している。
As shown in FIG. 2, the diffusing plate 3 has a light diffusing plate 3a for diffusing light upward and a fluorescent lamp 2 for diffusing the light.
4 and a heat shield plate 3b that shields heat transmitted from the liquid crystal display panel 1 to the liquid crystal display panel 1, and the thickness of the light diffusion plate 3a is 2
[Mm], the thickness of the heat shield plate 3b is 2 [mm], and the distance between the light diffusion plate 3a and the heat shield plate 3b is 0.5 [mm].
An air layer 6 is formed to be empty.

【0025】そして、上記拡散板3と反射板5との最長
の間隔は25〔mm〕であり、該反射板5は、上記第1
の蛍光灯2の真下に第1の蛍光灯2の数に応じて同じ形
状の縦断面が屈曲状の第1の反射板5aと、上記第2の
蛍光灯4の真下に第2の蛍光灯4から照射する光を上記
第2の蛍光灯4の輝度分布間に反射させて輝度分布を均
一にする縦断面が屈曲状の第2の反射板5bとを夫々の
蛍光灯2、4の長手方向に沿って一体に形成し、上記蛍
光灯2、4の真下に夫々一定間隔を空けて配設してい
る。
The longest distance between the diffusing plate 3 and the reflecting plate 5 is 25 [mm], and the reflecting plate 5 has the first gap.
Underneath the fluorescent lamps 2, the first reflecting plate 5a having the same vertical cross section according to the number of the first fluorescent lamps 2, and the second fluorescent lamps under the second fluorescent lamp 4 are formed. The light emitted from the second fluorescent lamp 4 is reflected between the luminance distributions of the second fluorescent lamps 4 to make the luminance distribution uniform. The fluorescent lamps 2 and 4 are integrally formed along the direction, and are arranged directly below the fluorescent lamps 2 and 4 at regular intervals.

【0026】上記第1の反射板5aの曲率は70〔m
m〕であり、上記液晶表示パネル1に対して垂直方向の
第1の蛍光灯2の中心から第1の反射板5aまでの夫々
の間隔は10〔mm〕であり、また、上記第2の反射板
5bの曲率は25〔mm〕であり、上記液晶表示パネル
1に対して垂直方向の第2の蛍光灯4の中心から第1の
反射板5bまでの夫々の間隔は10〔mm〕である。
The curvature of the first reflector 5a is 70 [m
m], the distance between the center of the first fluorescent lamp 2 and the first reflector 5a in the direction perpendicular to the liquid crystal display panel 1 is 10 [mm], and The curvature of the reflection plate 5b is 25 [mm], and the distance between the center of the second fluorescent lamp 4 and the first reflection plate 5b in the direction perpendicular to the liquid crystal display panel 1 is 10 [mm]. is there.

【0027】また、上記蛍光灯2、4と反射板5a、5
bとの関係は図3(a)〜(c)に示すように、図3
(a)は蛍光灯と反射板との間隔をBとすると蛍光灯の
真上の輝度分布は湾曲状となり、図3(b)は図3
(a)に示す反射板の曲率を小さくし、蛍光灯と反射板
との間隔をBしたもので、蛍光灯の真上の輝度分布は図
3(a)に示す輝度分布に比べて輝度は大きくなるが横
幅は狭くなる。
The fluorescent lamps 2 and 4 and the reflectors 5a and 5 are also provided.
The relationship with b is as shown in FIGS.
In FIG. 3A, when the distance between the fluorescent lamp and the reflector is B, the luminance distribution directly above the fluorescent lamp has a curved shape, and FIG.
The curvature of the reflector shown in (a) is reduced, and the distance between the fluorescent lamp and the reflector is set to B. The luminance distribution directly above the fluorescent lamp is higher than that shown in FIG. 3 (a). It becomes larger but the width becomes narrower.

【0028】図3(c)は図3(a)に示す蛍光灯と反
射板との間隔Bより1.5倍の間隔Cを空けたものだけ
で、蛍光灯の真上の輝度分布は図3(a)に示す輝度分
布に比べて輝度は小さくなるが横幅は広くなる。そし
て、反射板の曲率、蛍光灯と反射板との間隔及び蛍光灯
の輝度により輝度分布を調整することができる。
FIG. 3 (c) shows only the space C which is 1.5 times the space B between the fluorescent lamp and the reflector shown in FIG. 3 (a). Although the luminance is smaller than the luminance distribution shown in FIG. 3A, the width is wider. The brightness distribution can be adjusted by the curvature of the reflector, the distance between the fluorescent lamp and the reflector, and the brightness of the fluorescent lamp.

【0029】次に本発明の液晶用照明装置の第1の実施
例の実施状況について図4と共に詳細に説明する。ま
ず、蛍光灯2、4が点灯すると、該蛍光灯2、4により
液晶表示パネル1を照射し、該蛍光灯2、4から照射す
る光の一部は液晶表示パネル1と逆側に照射されるの
で、その照射された光は夫々の蛍光灯2、4の真下の反
射板5a、5bにて拡散板5を介して液晶表示パネル1
側に反射する。
Next, the implementation status of the first embodiment of the liquid crystal lighting device of the present invention will be described in detail with reference to FIG. First, when the fluorescent lamps 2 and 4 are turned on, the liquid crystal display panel 1 is irradiated with the fluorescent lamps 2 and 4, and a part of the light emitted from the fluorescent lamps 2 and 4 is irradiated to the opposite side of the liquid crystal display panel 1. Therefore, the radiated light is reflected by the liquid crystal display panel 1 through the diffusion plate 5 at the reflection plates 5a and 5b directly below the fluorescent lamps 2 and 4, respectively.
Reflect to the side.

【0030】そして、上記蛍光灯2、4から照射された
光が拡散板5を通過する際、上記拡散板5の光拡散板5
aにより均一に拡散され、しかも、拡散シートを使用し
ていないので、該拡散シートに光が吸収されて輝度分布
が低下することがない。
When the light emitted from the fluorescent lamps 2 and 4 passes through the diffusing plate 5, the light diffusing plate 5 of the diffusing plate 5 is used.
Since the light is diffused uniformly by a and the diffusion sheet is not used, light is not absorbed by the diffusion sheet and the luminance distribution is not lowered.

【0031】また、上記蛍光灯2,4から照射する光の
熱が液晶表示パネル1に伝わらないように拡散板5の熱
遮蔽板5bにより熱を遮蔽するが、さらに熱が完全に伝
わらないように空気層6にて断熱効果をもたらしてい
る。
Further, the heat of the light emitted from the fluorescent lamps 2 and 4 is shielded by the heat shield plate 5b of the diffusion plate 5 so that the heat is not transmitted to the liquid crystal display panel 1, but the heat is not completely transmitted. The air layer 6 has a heat insulating effect.

【0032】上記第1の蛍光灯2の真上の輝度分布は図
4に示す破線Dのような湾曲が連なった状態になり、上
記第2の蛍光灯4の真上の輝度分布は図4に示す破線E
のような湾曲が第1の蛍光灯2の夫々の輝度分布間に位
置する。そしてこれらの輝度分布を合わせると、図4に
示す実線Fのような滑らかで均一な輝度分布が得られ
る。
The above-mentioned brightness distribution of the first fluorescent lamp 2 is in a state where the curves shown by the broken line D in FIG. 4 are continuous, and the above-mentioned brightness distribution of the second fluorescent lamp 4 is shown in FIG. Dashed line E
Such a curve is located between the respective brightness distributions of the first fluorescent lamp 2. When these luminance distributions are combined, a smooth and uniform luminance distribution as shown by the solid line F in FIG. 4 can be obtained.

【0033】上記第1の実施例のように構成することに
より、夫々の第1の蛍光灯2間で生じる輝度むらに第2
の反射板3bにて第1の蛍光灯2から照射する光を反射
することより、大型の液晶パネルに用いても第1の蛍光
灯2間で生じる輝度むらが増加することなく、蛍光灯
2、4から液晶表示パネル1に照射する光の輝度分布を
均一にすることができ、表示品位の低下を防止すること
ができる。
By configuring as in the first embodiment described above, it is possible to reduce the uneven brightness generated between the first fluorescent lamps 2 to the second.
Since the light emitted from the first fluorescent lamp 2 is reflected by the reflection plate 3b of the first fluorescent lamp 2, the uneven brightness generated between the first fluorescent lamps 2 does not increase even when used in a large liquid crystal panel, and the fluorescent lamp 2 It is possible to make the luminance distribution of the light radiated from 4 to the liquid crystal display panel 1 uniform and prevent the deterioration of display quality.

【0034】しかも、拡散シートを用いることなく輝度
分布を均一にすることができるので、拡散シートを用い
ることにより生じる装置全体の重さ及びコストの増大、
輝度分布の低下を防止することができる。
Moreover, since the luminance distribution can be made uniform without using the diffusion sheet, the weight and cost of the entire device, which are increased by using the diffusion sheet, are increased.
It is possible to prevent deterioration of the brightness distribution.

【0035】そして、第2の蛍光灯4を少なくとも第1
の蛍光灯2より液晶表示パネル1側に配設することによ
り、液晶表示パネル1と第2の蛍光灯4の間隔が第1の
蛍光灯2よりも短くなるので、第1の蛍光灯2よりも小
さい輝度の蛍光灯を用いることができて、消費電力量を
低減させることができる。
Then, the second fluorescent lamp 4 is connected to at least the first fluorescent lamp.
By disposing the fluorescent lamp 2 closer to the liquid crystal display panel 1 than the first fluorescent lamp 2, the distance between the liquid crystal display panel 1 and the second fluorescent lamp 4 becomes shorter than that of the first fluorescent lamp 2. It is possible to use a fluorescent lamp having a low brightness, and it is possible to reduce power consumption.

【0036】また、光拡散板5aにより蛍光灯2,4か
らの光を拡散するとともに、蛍光灯2,4からの照射す
る光の熱が液晶表示パネル1に伝わるのを熱遮蔽板5b
にて遮蔽することにより、輝度分布を均一にしながら蛍
光灯2、4からの照射する光の熱影響を受けないように
して、照明装置の信頼性を向上させることができる。
The light diffusing plate 5a diffuses the light from the fluorescent lamps 2 and 4 and prevents the heat of the light emitted from the fluorescent lamps 2 and 4 from being transmitted to the liquid crystal display panel 1.
By shielding the light with a uniform brightness distribution, the light emitted from the fluorescent lamps 2 and 4 is not affected by heat and the reliability of the lighting device can be improved.

【0037】本発明の液晶用照明装置の第2の実施例は
図5及び図6に示すように構成するものであり、尚、上
記第1の実施例と第2の実施例との同一部分には同一符
号を付し、その説明を省略する。図5において、上記第
1の実施例と異なる構成は、上記第2の蛍光灯4を直径
8〔mm〕のものを使用し、上記第1の蛍光灯2の同一
平面状の夫々の第1の蛍光灯2間の中央に第2の蛍光灯
4を配置し、該第2の蛍光灯4の輝度分布を上記第1の
蛍光灯2の輝度分布間に位置するように第2の反射板4
の形状を調節してなるものである。
The second embodiment of the liquid crystal lighting device of the present invention is constructed as shown in FIGS. 5 and 6, and the same parts as those of the first and second embodiments. Are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 5, the structure different from that of the first embodiment uses the second fluorescent lamp 4 having a diameter of 8 mm, and the first fluorescent lamp 2 has the same first planar shape. Second fluorescent lamps 4 are arranged in the center between the fluorescent lamps 2 and the second reflector is arranged such that the luminance distribution of the second fluorescent lamps 4 is located between the luminance distributions of the first fluorescent lamps 2. Four
The shape is adjusted.

【0038】上記第2の実施例の輝度分布は特に図6に
示すように、第1の蛍光灯2の輝度分布は図6に示す破
線Gのような湾曲が連なった状態になり、第2の蛍光灯
4の輝度分布は図6に示す破線Hのような湾曲を第1の
蛍光灯2の輝度分布間に位置する。そしてこれらの輝度
分布を合わせると、図6に示す実線Iのような略滑らか
で均一な輝度分布にすることができる。
The luminance distribution of the second embodiment is particularly shown in FIG. 6, and the luminance distribution of the first fluorescent lamp 2 is in a state in which the curved line G shown in FIG. The brightness distribution of the fluorescent lamp 4 of No. 1 is located between the brightness distributions of the first fluorescent lamps 2 having a curve as shown by the broken line H in FIG. When these luminance distributions are combined, a substantially smooth and uniform luminance distribution as shown by the solid line I in FIG. 6 can be obtained.

【0039】本発明の液晶用照明装置の第3の実施例は
図7及び図8に示すように構成するものであり、尚、上
記第1の実施例と第3の実施例との同一部分には同一符
号を付し、その説明を省略する。図7において、上記第
1の実施例と異なる構成は、上記第2の蛍光灯4を楕円
形状のものを使用し、該楕円の長手方向を上記液晶表示
パネル1に対して垂直方向に向けて第2の蛍光灯4を配
設してなるものである。
The third embodiment of the liquid crystal lighting device of the present invention is constructed as shown in FIGS. 7 and 8, and the same parts as those of the first and third embodiments described above. Are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 7, a configuration different from that of the first embodiment is that the second fluorescent lamp 4 has an elliptical shape, and the longitudinal direction of the ellipse is oriented in a direction perpendicular to the liquid crystal display panel 1. The second fluorescent lamp 4 is provided.

【0040】上記第3の実施例の輝度分布は特に図8に
示すように、第1の蛍光灯2の輝度分布は図8に示す破
線Jのような湾曲が連なった状態になり、第2の蛍光灯
4の輝度分布は図8に示す破線Kのような湾曲が第1の
蛍光灯2の輝度分布間に位置する。そしてこれらの輝度
分布を合わせると、図8に示す実線Lのような略滑らか
で均一で、且つ上記第1及び第2の実施例の輝度分布よ
り大きな輝度分布を得ることができる。
The luminance distribution of the third embodiment is particularly shown in FIG. 8, and the luminance distribution of the first fluorescent lamp 2 is in the state of continuous curves as indicated by the broken line J in FIG. In the luminance distribution of the fluorescent lamp 4 of No. 2, a curve like the broken line K shown in FIG. 8 is located between the luminance distributions of the first fluorescent lamp 2. When these luminance distributions are combined, a substantially smooth and uniform luminance distribution as shown by the solid line L in FIG. 8 and a luminance distribution larger than the luminance distributions of the first and second embodiments can be obtained.

【0041】上記第3の実施例のように構成することに
より、第2の蛍光灯4に光の指向性を持たせ、且つ第2
の蛍光灯4の径を小さくすることで耐熱の問題により第
2の蛍光灯4に流れる電流に制約されることがない。
By configuring as in the third embodiment, the second fluorescent lamp 4 is provided with the directivity of light, and the second fluorescent lamp 4 is provided with the second fluorescent lamp.
By reducing the diameter of the fluorescent lamp 4, the current is not restricted by the current flowing through the second fluorescent lamp 4 due to heat resistance.

【0042】尚、蛍光灯の輝度、反射板の曲率及び蛍光
灯と反射板との間隔により輝度分布を調節することがで
きるので、上記実施例のみだけに限定されることはな
い。
Since the brightness distribution can be adjusted by the brightness of the fluorescent lamp, the curvature of the reflector and the distance between the fluorescent lamp and the reflector, the present invention is not limited to the above embodiment.

【0043】[0043]

【発明の効果】本発明の液晶用照明装置は上記のような
構成であるから、請求項1記載の発明は、第2の反射板
にて第1の光源の輝度分布間に第1の光源から照射する
光を反射させることより、大型の液晶パネルに用いても
光源間で生じる輝度むらが増加することなく、光源から
液晶表示パネルに照射する光の輝度分布を均一にするこ
とができ、表示品位が低下するのを防止することができ
る。
Since the liquid crystal lighting device of the present invention is configured as described above, the invention according to claim 1 is such that the first light source is provided between the luminance distributions of the first light source by the second reflecting plate. By reflecting the light radiated from the light source, even when used in a large liquid crystal panel, the unevenness in brightness generated between the light sources does not increase, and the brightness distribution of the light radiated from the light source to the liquid crystal display panel can be made uniform. It is possible to prevent the display quality from deteriorating.

【0044】しかも、拡散シートを用いることなく輝度
分布を均一にすることができるので、拡散シートを用い
ることにより生じる装置全体の重さ及びコストの増大、
輝度分布の低下を防止することができる。
Moreover, since the brightness distribution can be made uniform without using the diffusion sheet, the weight and cost of the entire device, which are increased by using the diffusion sheet, are increased.
It is possible to prevent deterioration of the brightness distribution.

【0045】そして請求項2記載の発明は、上記請求項
1記載の効果に加えて、第2の光源を少なくとも第1の
光源より液晶表示パネル側に配設することにより、液晶
表示パネルと第2の光源との間隔が第1の光源よりも短
くなるので、第1の光源よりも小さい輝度の光源を用い
ることができて、消費電力量を低減させることができ
る。
According to a second aspect of the present invention, in addition to the effect of the first aspect, the second light source is disposed at least on the liquid crystal display panel side of the first light source, so that the liquid crystal display panel and the second light source are provided. Since the distance from the second light source is shorter than that of the first light source, it is possible to use a light source having a brightness smaller than that of the first light source, and it is possible to reduce power consumption.

【0046】また請求項3記載の発明は、上記請求項1
記載の効果に加えて、光拡散板により第1の光源及び第
2の光源からの光を拡散するとともに、第1の光源及び
第2の光源から照射する光の熱が液晶表示パネルに伝わ
るのを熱遮蔽板にて遮蔽することにより、輝度分布を均
一にしながら第1の光源及び第2の光源からの熱影響を
受けないようにして、照明装置の信頼性を向上させるこ
とができる。
The invention according to claim 3 is the above-mentioned claim 1.
In addition to the effects described above, the light diffuser plate diffuses the light from the first light source and the second light source, and the heat of the light emitted from the first light source and the second light source is transmitted to the liquid crystal display panel. It is possible to improve the reliability of the illuminating device by blocking the heat from the first light source and the second light source while making the luminance distribution uniform by shielding the light with the heat shielding plate.

【0047】さらに請求項4記載の発明は、上記請求項
1記載の効果に加えて、第2の光源の縦断面を楕円状に
形成し、該楕円の長手方向を液晶表示パネルに対して垂
直に向けて第2の光源を配設することにより、第2の光
源に光の指向性を持たせ、且つ第2の光源の径を小さく
することで耐熱の問題により第2の光源に流れる電流に
制約されることがない。
Further, in addition to the effect of claim 1, the invention according to claim 4 is characterized in that the vertical cross section of the second light source is formed in an elliptical shape, and the longitudinal direction of the ellipse is perpendicular to the liquid crystal display panel. By arranging the second light source toward the second light source, the second light source has a directivity of light, and the diameter of the second light source is made small, so that the current flowing through the second light source due to a heat resistance problem. Is not restricted to.

【0048】しかも請求項5記載の発明は、上記請求項
3記載の効果に加えて、光拡散板と熱遮蔽板との間に空
気層を形成することにより、第1の光源及び第2の光源
から放射する光の熱が液晶表示パネルに伝わるのを空気
層の断熱効果により遮断するので、さらに照明装置の信
頼性を向上させることができる。
In addition to the effect of claim 3, the invention of claim 5 forms an air layer between the light diffusing plate and the heat shield plate to provide the first light source and the second light source. The heat of the light emitted from the light source is prevented from being transmitted to the liquid crystal display panel by the heat insulating effect of the air layer, so that the reliability of the lighting device can be further improved.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の液晶用照明装置の第1の実施例を示す
要部断面図である。
FIG. 1 is a cross-sectional view of essential parts showing a first embodiment of a liquid crystal lighting device of the present invention.

【図2】図1に示すA部の要部拡大断面図である。FIG. 2 is an enlarged cross-sectional view of a main part of a portion A shown in FIG.

【図3】(a)〜(c)は本発明の液晶用照明装置の第
1の実施例を示す蛍光灯と反射板との関係により生じる
輝度分布の特性図である。
3 (a) to 3 (c) are characteristic diagrams of a luminance distribution generated by a relationship between a fluorescent lamp and a reflecting plate showing a first embodiment of the liquid crystal lighting device of the present invention.

【図4】本発明の液晶用照明装置の第1の実施例を示す
輝度分布の特性図である。
FIG. 4 is a luminance distribution characteristic diagram showing the first embodiment of the liquid crystal lighting device of the present invention.

【図5】本発明の液晶用照明装置の第2の実施例を示す
要部断面図である。
FIG. 5 is a cross-sectional view of essential parts showing a second embodiment of the liquid crystal lighting device of the present invention.

【図6】本発明の液晶用照明装置の第2の実施例を示す
輝度分布の特性図である。
FIG. 6 is a luminance distribution characteristic diagram showing a second embodiment of the liquid crystal lighting device of the present invention.

【図7】本発明の液晶用照明装置の第3の実施例を示す
要部断面図である。
FIG. 7 is a cross-sectional view of essential parts showing a third embodiment of the liquid crystal lighting device of the present invention.

【図8】本発明の液晶用照明装置の第3の実施例を示す
輝度分布の特性図である。
FIG. 8 is a luminance distribution characteristic diagram showing a third embodiment of the liquid crystal lighting device of the present invention.

【図9】従来の液晶用照明装置の要部断面図である。FIG. 9 is a sectional view of a main part of a conventional liquid crystal lighting device.

【符号の説明】[Explanation of symbols]

1 液晶表示パネル 2 第1の蛍光灯 3a 光拡散板 3b 熱遮蔽板 4 第2の蛍光灯 5a 第1の反射板 5b 第2の反射板 1 Liquid Crystal Display Panel 2 First Fluorescent Lamp 3a Light Diffusing Plate 3b Heat Shielding Plate 4 Second Fluorescent Lamp 5a First Reflecting Plate 5b Second Reflecting Plate

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】 液晶表示パネルと平行に複数の第1の光
源を一定間隔空けて液晶表示パネルの真下に配設し、該
液晶表示パネルと第1の光源との間に拡散板を液晶表示
パネルに対して平行に設け、該第1の光源の下方に第1
の光源の数に応じて同一形状の第1の反射板を第1の光
源に対して一定間隔空けて配設し、上記拡散板の真下の
第1の光源間の中央に第1の光源と異なる輝度の第2の
光源を設け、該第2の光源から照射する光を上記第1の
光源の輝度分布間に反射させて輝度分布を均一にする第
2の反射板を第2の光源に対して下方に一定間隔空けて
配設してなることを特徴とする液晶用照明装置。
1. A plurality of first light sources are arranged parallel to the liquid crystal display panel at regular intervals directly below the liquid crystal display panel, and a diffusion plate is provided between the liquid crystal display panel and the first light source to display a liquid crystal. It is provided parallel to the panel, and the first light source is provided below the first light source.
The first reflectors having the same shape according to the number of the light sources are arranged at a constant interval with respect to the first light sources, and the first light sources are provided in the center between the first light sources directly below the diffusion plate. The second light source is provided with a second light source having different brightness, and the second light source is configured to reflect the light emitted from the second light source between the brightness distributions of the first light source to make the brightness distribution uniform. On the other hand, a liquid crystal lighting device characterized in that the lighting device for liquid crystal is arranged at a fixed interval below.
【請求項2】 上記第2の光源を少なくとも第1の光源
より液晶表示パネル側に配設してなることを特徴とする
請求項1記載の液晶用照明装置。
2. The liquid crystal lighting device according to claim 1, wherein the second light source is arranged at least on the liquid crystal display panel side of the first light source.
【請求項3】 上記拡散板を、光を拡散する光拡散板
と、熱を遮蔽する熱遮蔽板とで形成してなることを特徴
とする請求項1記載の液晶用照明装置。
3. The liquid crystal lighting device according to claim 1, wherein the diffusion plate is formed of a light diffusion plate for diffusing light and a heat shielding plate for shielding heat.
【請求項4】 上記第2の光源の縦断面を楕円状に形成
し、該楕円の長手方向を上記液晶表示パネルに対して垂
直方向に向けて第2の光源を配設してなることを特徴と
する請求項1記載の液晶用照明装置。
4. The vertical cross section of the second light source is formed in an elliptical shape, and the second light source is arranged so that the longitudinal direction of the ellipse is perpendicular to the liquid crystal display panel. The liquid crystal lighting device according to claim 1, wherein the lighting device is a liquid crystal lighting device.
【請求項5】 上記光拡散板と熱遮蔽板との間に空気層
を形成してなることを特徴とする請求項3記載の液晶用
照明装置。
5. The liquid crystal lighting device according to claim 3, wherein an air layer is formed between the light diffusion plate and the heat shield plate.
JP06325474A 1994-12-27 1994-12-27 LCD lighting system Expired - Fee Related JP3086609B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP06325474A JP3086609B2 (en) 1994-12-27 1994-12-27 LCD lighting system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP06325474A JP3086609B2 (en) 1994-12-27 1994-12-27 LCD lighting system

Publications (2)

Publication Number Publication Date
JPH08179318A true JPH08179318A (en) 1996-07-12
JP3086609B2 JP3086609B2 (en) 2000-09-11

Family

ID=18177290

Family Applications (1)

Application Number Title Priority Date Filing Date
JP06325474A Expired - Fee Related JP3086609B2 (en) 1994-12-27 1994-12-27 LCD lighting system

Country Status (1)

Country Link
JP (1) JP3086609B2 (en)

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