JPH0731223Y2 - Backlight device - Google Patents
Backlight deviceInfo
- Publication number
- JPH0731223Y2 JPH0731223Y2 JP1986172308U JP17230886U JPH0731223Y2 JP H0731223 Y2 JPH0731223 Y2 JP H0731223Y2 JP 1986172308 U JP1986172308 U JP 1986172308U JP 17230886 U JP17230886 U JP 17230886U JP H0731223 Y2 JPH0731223 Y2 JP H0731223Y2
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- backlight device
- plate
- liquid crystal
- 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.)
- Expired - Lifetime
Links
Landscapes
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Description
【考案の詳細な説明】 [考案の技術分野] この考案は液晶表示パネル等に用いられるバックライト
装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a backlight device used for a liquid crystal display panel or the like.
[従来技術とその問題点] 従来のバックライト装置は第4図に示すように、光を拡
散する拡散板8に光を反射するアルミ等の金属板による
反射板7を取り付け、この反射板の焦点位置に光源とな
る蛍光管6を配設したもので、このバックライト装置を
下部偏光板3bを介して液晶表示パネル2に取り付けてお
き、前記蛍光管6を点灯することにより液晶表示パネル
2を照射するようにしていた。なお3aは上部偏光板であ
る。[Prior Art and its Problems] As shown in FIG. 4, a conventional backlight device has a diffusing plate 8 for diffusing light, and a reflecting plate 7 made of a metal plate such as aluminum for reflecting light attached to the diffusing plate 8. A fluorescent tube 6 serving as a light source is arranged at a focal position, and this backlight device is attached to the liquid crystal display panel 2 through the lower polarizing plate 3b, and the fluorescent tube 6 is turned on to turn on the liquid crystal display panel 2. Was to be irradiated. Note that 3a is an upper polarizing plate.
この従来のバックライト装置においては、蛍光管6から
出された光は直接、あるいは反射板7により反射された
反射光が液晶表示パネル2に照射されるため、蛍光管6
に近い位置では直接光によって明るいが、蛍光管6より
離れた位置では直接光が減少して暗くなる。このため拡
散板8により光拡散させて輝度ムラをおさえているが、
拡散板の拡散効果を高くすると全体に輝度が低くなると
いう欠点があった。In this conventional backlight device, the light emitted from the fluorescent tube 6 is directly applied to the liquid crystal display panel 2, or the reflected light reflected by the reflector 7 is applied to the liquid crystal display panel 2.
The direct light is bright at a position close to, but the direct light is reduced and becomes dark at a position away from the fluorescent tube 6. Therefore, light is diffused by the diffusion plate 8 to suppress uneven brightness,
When the diffusion effect of the diffusion plate is increased, there is a drawback that the brightness is lowered as a whole.
[考案の目的] この考案は上述した事情に鑑みてなされたもので、その
目的とするところは、明るく輝度ムラの無い均一な光で
液晶表示パネル等の照明を行なえるバックライト装置を
提供することである。[Object of the Invention] The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a backlight device capable of illuminating a liquid crystal display panel or the like with uniform light that is bright and has no uneven brightness. That is.
[考案の要点] この考案は、上述した目的を達成するために、反射板を
光源を囲むように湾曲させて構成するとともに、前記光
源の、前記反射板に入射する前記光源からの光を遮断し
ない位置に半透過反射部を設け、拡散板の光源から近い
部分への照明を減じ、また反射板の面積を有効に利用す
るようにしたことを要点とするものである。[Summary of the Invention] In order to achieve the above-mentioned object, the invention is configured such that a reflector is curved so as to surround a light source, and the light from the light source that enters the reflector is blocked. The main point is to provide a semi-transmissive reflection part at a position not to do so, reduce illumination to a portion of the diffuser plate close to the light source, and effectively utilize the area of the reflector plate.
[実施例] 以下、本考案の一実施例を第1図乃至第3図により説明
する。第1図はバックライト装置の側面断面図、第2図
は第1図のバックライト装置に用いられる電子管の側面
断面図、第3図は第2図の電子管のガラス管部の断面図
である。[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. 1 is a side sectional view of a backlight device, FIG. 2 is a side sectional view of an electron tube used in the backlight device of FIG. 1, and FIG. 3 is a sectional view of a glass tube portion of the electron tube of FIG. .
この考案に係るバックライト装置1は第1図に示すよう
に、液晶表示パネル2の上部及び下部にはそれぞれ上部
偏光板3aと下部偏光板3bとが設けられている。バックラ
イト装置1は前記下部偏光板3bの下側に密接して設けら
れた発光部で、上面に下部偏光板3bを囲んでパネル4が
設けてある。このパネル4は光透過性のものであって、
このパネル4の上面側には前記下部偏光板3bを収納する
凹部があって、下部偏光板3bはこの凹部内に収納密接さ
れるようになっている。このパネル4の凹部の下部には
光拡散性を有する液状断熱冷媒5が封入されている。こ
の液状断熱冷媒5は後述する電子管6の発熱を吸収する
とともに、電子管6より照射された光を拡散する特性を
有し、電子管6の光を拡散するものである。この液晶状
断熱冷媒5を封入したパネル4の下側には二次曲面で形
成された反射板7が取り付けてある。この反射板7は第
1図においては光源となる電子管6が2本であるので中
央部にくびれのあるものを用いてあるが、電子管6が1
本の場合は二次曲面だけで構成された反射部を有してあ
ればよい。この反射板7は薄い金属板を成形加工したも
ので、内面側には例えばアルミ等の蒸着金属膜を有し光
を一定方向に反射するようになっている。この二次曲面
からなる反射板7の焦点位置には光源となる電子管6が
設けてある。この電子管6は第2図に示すように、細長
いガラス管6aの両端部に電極6b、6bを配して密閉された
もので、内部に水銀蒸気を封入しガラス管の内面に蛍光
膜6cを設けた蛍光ランプであって、この蛍光膜6cの外側
の一部に半透過性反射膜8が設けてある(第3図参
照)。この半透過性反射膜8はガラス管6aの円形面に沿
って扇形の周線部に設けられた膜で、光の一部を透過す
るとともにその一部を反射させるものである。In the backlight device 1 according to the present invention, as shown in FIG. 1, an upper polarizing plate 3a and a lower polarizing plate 3b are provided on an upper portion and a lower portion of a liquid crystal display panel 2, respectively. The backlight device 1 is a light-emitting portion which is provided in close contact with the lower side of the lower polarizing plate 3b, and a panel 4 is provided on the upper surface so as to surround the lower polarizing plate 3b. This panel 4 is light transmissive,
On the upper surface side of the panel 4, there is a concave portion for accommodating the lower polarizing plate 3b, and the lower polarizing plate 3b is accommodated in the concave portion. A liquid adiabatic refrigerant 5 having a light diffusing property is enclosed in the lower part of the concave portion of the panel 4. The liquid heat insulating refrigerant 5 has a characteristic of absorbing heat generated by the electron tube 6 described later and diffusing light emitted from the electron tube 6, and diffusing light of the electron tube 6. A reflection plate 7 having a quadric surface is attached to the lower side of the panel 4 in which the liquid crystal heat insulating refrigerant 5 is enclosed. In FIG. 1, the reflector 7 has two electron tubes 6 serving as a light source, so that one having a constriction at the center is used.
In the case of a book, it suffices to have a reflecting portion composed only of a quadric surface. The reflection plate 7 is formed by forming a thin metal plate, and has a vapor-deposited metal film of aluminum or the like on the inner surface side so as to reflect light in a fixed direction. An electron tube 6 serving as a light source is provided at the focal position of the reflecting plate 7 having the quadric surface. As shown in FIG. 2, this electron tube 6 is a long and narrow glass tube 6a in which electrodes 6b and 6b are arranged at both ends of the elongated glass tube 6a and hermetically sealed. In the provided fluorescent lamp, a semi-transmissive reflective film 8 is provided on a part of the outside of the fluorescent film 6c (see FIG. 3). The semi-transmissive reflective film 8 is a film provided on a fan-shaped peripheral portion along the circular surface of the glass tube 6a, and transmits a part of light and reflects a part thereof.
上述の半透過性反射膜8を有する電子管6をバックライ
ト装置に装着し、半透過性反射膜8を設けた側を前記パ
ネル4側に配置し点灯すると、第1図に示すように電子
管6よりの直接光の一部Aは半透過性反射膜8に阻止さ
れてその光量を削減され、半透過性反射膜8で反射され
た光の一部は反射板7で再度反射されて周辺側の光量が
増加し、パネル4に均等な光を照射することになる。し
たがって、液晶表示パネル2には輝度ムラのない光を与
えることが可能となる。また、パネル4内に封入されて
液状断熱冷媒5の作用で電子管6より発生された熱は、
液晶表示パネル2に伝わることなく発熱によるコントラ
ストの低下を防止することができる。When the electron tube 6 having the above-mentioned semi-transmissive reflective film 8 is attached to a backlight device and the side provided with the semi-transmissive reflective film 8 is arranged on the side of the panel 4 and is turned on, the electron tube 6 as shown in FIG. A part of the direct light is blocked by the semi-transmissive reflective film 8 and the amount of the light is reduced, and a part of the light reflected by the semi-transmissive reflective film 8 is reflected again by the reflective plate 7 to the peripheral side. The amount of light is increased and the panel 4 is irradiated with uniform light. Therefore, it is possible to provide the liquid crystal display panel 2 with light without uneven brightness. Further, the heat generated from the electron tube 6 by the action of the liquid heat insulating refrigerant 5 enclosed in the panel 4 is
It is possible to prevent a decrease in contrast due to heat generation without being transmitted to the liquid crystal display panel 2.
[考案の効果] この考案は、以上詳細に説明したように、反射板を光源
を囲むように湾曲させて構成するとともに、光源の、反
射板に入射する前記光源からの光を遮断しない位置に半
透過反射部を設け、前記反射板の広い範囲に光を入射さ
せ、また拡散板の光源から近い部分への照明を減じたの
で、反射板の面積を有効に利用でき、明るく輝度ムラの
無い均一な光で液晶表示パネル等の照明を行なうことが
できる。[Effects of the Invention] As described in detail above, the present invention is configured such that the reflector is curved so as to surround the light source, and the light source is placed at a position where the light from the light source incident on the reflector is not blocked. Since a semi-transmissive reflection part is provided to allow light to enter a wide range of the reflector and to reduce the illumination of the diffuser from the light source, the area of the reflector can be effectively used and there is no brightness unevenness. It is possible to illuminate a liquid crystal display panel or the like with uniform light.
第1図は本考案の一実施例のバックライト装置の側面断
面図、第2図は第1図のバックライト装置に用いられた
電子管の側面断面図、第3図は第2図の電子管のガラス
管部の断面図、第4図は従来例の側面断面図である。 1……バックライト装置、2……液晶表示パネル、4…
…パネル(拡散板)、6……電子管、6c……蛍光膜、8
……半透過性反射膜。1 is a side sectional view of a backlight device according to an embodiment of the present invention, FIG. 2 is a side sectional view of an electron tube used in the backlight device of FIG. 1, and FIG. 3 is a side sectional view of the electron tube of FIG. FIG. 4 is a sectional view of the glass tube portion, and FIG. 4 is a side sectional view of a conventional example. 1 ... Backlight device, 2 ... Liquid crystal display panel, 4 ...
… Panel (diffuser), 6… electron tube, 6c… fluorescent film, 8
...... Semi-transmissive reflective film.
Claims (1)
射板と、前記光源の前面側に設けられた拡散板を備えた
バックライト装置において、 前記反射板を前記光源を囲むように湾曲させて構成する
とともに、 前記光源の、前記反射板に入射する前記光源からの光を
遮断しない位置に半透過反射部を設けたことを特徴とす
るバックライト装置。1. A backlight device comprising a light source, a reflection plate provided on the back side of the light source, and a diffusion plate provided on the front side of the light source, wherein the reflection plate surrounds the light source. A backlight device, which is configured to be curved, and which is provided with a semi-transmissive reflection portion at a position of the light source that does not block light from the light source that is incident on the reflection plate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986172308U JPH0731223Y2 (en) | 1986-11-10 | 1986-11-10 | Backlight device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986172308U JPH0731223Y2 (en) | 1986-11-10 | 1986-11-10 | Backlight device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS6378923U JPS6378923U (en) | 1988-05-25 |
JPH0731223Y2 true JPH0731223Y2 (en) | 1995-07-19 |
Family
ID=31108732
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1986172308U Expired - Lifetime JPH0731223Y2 (en) | 1986-11-10 | 1986-11-10 | Backlight device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0731223Y2 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007042613A (en) * | 2005-07-07 | 2007-02-15 | Matsushita Electric Works Ltd | Lighting system for liquid crystal panel |
JP5948813B2 (en) * | 2011-05-09 | 2016-07-06 | ソニー株式会社 | Illumination device and display device |
-
1986
- 1986-11-10 JP JP1986172308U patent/JPH0731223Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPS6378923U (en) | 1988-05-25 |
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