JPH0894847A - Surface light source element and liquid crystal display device - Google Patents
Surface light source element and liquid crystal display deviceInfo
- Publication number
- JPH0894847A JPH0894847A JP6232801A JP23280194A JPH0894847A JP H0894847 A JPH0894847 A JP H0894847A JP 6232801 A JP6232801 A JP 6232801A JP 23280194 A JP23280194 A JP 23280194A JP H0894847 A JPH0894847 A JP H0894847A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- plate
- liquid crystal
- guide plate
- 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)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は平面状に光照射する面光
源素子並びにその面光源素子を搭載した液晶表示装置に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source element for irradiating light in a plane and a liquid crystal display device equipped with the surface light source element.
【0002】[0002]
【従来の技術】時分割方式やアクティブマトリクス方式
の液晶表示装置は、その視認性の向上をはかるためにバ
ックライト方式が採用されている。特にカラー液晶表示
装置においては、モノクロの液晶表示装置と比べてパネ
ル透過率が極めて低いため、高輝度の薄型照明装置が要
求される。2. Description of the Related Art A liquid crystal display device of a time division system or an active matrix system employs a backlight system in order to improve its visibility. In particular, a color liquid crystal display device has an extremely low panel transmittance as compared with a monochrome liquid crystal display device, and thus a thin illuminating device with high brightness is required.
【0003】図5は、この薄型照明装置を搭載した液晶
表示装置1の一例であり、液晶パネル2に矩形状導光板
3を配設し、この導光板3の端面に蛍光ランプ4を置く
2灯タイプのエッジライト方式である(特開昭51−8
8042号、特開昭64−57240号、特開平2−1
7号、特開平4−10913号、特開平6−67025
号等参照)。FIG. 5 shows an example of a liquid crystal display device 1 equipped with this thin lighting device. A rectangular light guide plate 3 is arranged on a liquid crystal panel 2, and a fluorescent lamp 4 is placed on an end face of the light guide plate 2. It is a light type edge light system (Japanese Patent Laid-Open No. 51-8).
8042, JP-A-64-57240, JP-A 2-1
7, JP-A-4-10913, JP-A-6-67025.
No.).
【0004】同図によれば、導光板3の一主面に拡散板
5を設けるとともに、この導光板3の対向する一対の両
辺に沿って長尺円筒状蛍光ランプ4を配設し、更に他主
面と蛍光ランプ4を覆うように、それぞれに反射板6、
光源用反射板7とを設けている。According to FIG. 1, a diffuser plate 5 is provided on one main surface of the light guide plate 3, and a long cylindrical fluorescent lamp 4 is arranged along a pair of opposite sides of the light guide plate 3, and further. Reflecting plate 6, so as to cover the other main surface and fluorescent lamp 4, respectively.
The light source reflector 7 is provided.
【0005】上記液晶表示装置1によれば、蛍光ランプ
4の照射光が直に導光板3を投光したり、あるいは一部
の照射光は光源用反射板7により反射し、その反射光も
導光板3に導かれ、そして、導光板3に導入された光は
反射板6により反射されながら、拡散板5を介して液晶
パネル2を光照射するという構成である。According to the above liquid crystal display device 1, the irradiation light of the fluorescent lamp 4 directly projects the light guide plate 3, or a part of the irradiation light is reflected by the light source reflection plate 7, and the reflected light is also reflected. The light guided to the light guide plate 3 and introduced into the light guide plate 3 is reflected by the reflection plate 6 and irradiates the liquid crystal panel 2 through the diffusion plate 5.
【0006】[0006]
【発明が解決しようとする問題点】しかしながら、上記
構成の液晶表示装置1は、エッジライト方式の照明装置
により高輝度が得られたが、最近の要求に対しては、未
だ十分に満足できる程度の高い輝度が得られていない。However, although the liquid crystal display device 1 having the above-described structure can obtain high brightness by the edge light type illumination device, it is still sufficiently satisfying the recent demands. High brightness is not obtained.
【0007】そこで、本発明者が上記構成の液晶表示装
置1について、更に鋭意研究を重ねた結果、その装置1
の要部拡大図である図6に示す通り、長尺円筒状蛍光ラ
ンプ4の照射光の一部が光源用反射板7を投光すると、
その反射板7における反射光が蛍光ランプ4に戻って、
その外面上で反射し、その反射光が更に光源用反射板7
を再び投光し、次いで蛍光ランプ4に入射するという光
路が多くなり、このような繰り返しの反射により漸次光
量が減衰し、そのために導光板3に導入される光が減少
し、その分、高い輝度が得られないということを知見し
た。Therefore, as a result of further in-depth research by the inventor of the liquid crystal display device 1 having the above structure, the device 1
As shown in FIG. 6, which is an enlarged view of the main part of FIG. 6, when a part of the irradiation light of the long cylindrical fluorescent lamp 4 projects the light source reflection plate 7,
The reflected light from the reflector 7 returns to the fluorescent lamp 4,
The light is reflected on the outer surface, and the reflected light is further reflected by the light source reflector plate 7.
The number of light paths for projecting light again and then entering the fluorescent lamp 4 increases, and the amount of light gradually attenuates due to such repeated reflections. Therefore, the amount of light introduced into the light guide plate 3 decreases, which is high. It was found that the brightness could not be obtained.
【0008】したがって、本発明の目的は高い輝度を達
成したエッジライト方式の面光源素子を提供することに
ある。Therefore, an object of the present invention is to provide an edge light type surface light source device which achieves high brightness.
【0009】更に本発明の目的は高輝度の面光源素子を
搭載した高性能な液晶表示装置を提供することにある。A further object of the present invention is to provide a high-performance liquid crystal display device equipped with a high brightness surface light source element.
【0010】[0010]
【問題点を解決するための手段】請求項1の面光源素子
は、光反射手段を一主面に設けた導光板の一端面に長尺
状光源を配設するとともに、この長尺状光源の導光板と
反対側のほぼ半外周領域に光反射層を被覆し、上記長尺
状光源の長手方向に沿って横断面形状が湾曲した光反射
面を有する反射部材を配設して、上記導光板の他主面側
より光出射するようにしたことを特徴とするものであ
る。According to a surface light source element of claim 1, an elongated light source is arranged on one end surface of a light guide plate having a light reflection means on one main surface, and the elongated light source is provided. A light reflecting layer is coated on a substantially semi-peripheral region on the side opposite to the light guide plate, and a reflecting member having a light reflecting surface whose cross-sectional shape is curved is disposed along the longitudinal direction of the elongated light source, It is characterized in that light is emitted from the other main surface side of the light guide plate.
【0011】請求項2の液晶表示装置は、上記構成の面
光源素子の他主面側に光拡散板を介して液晶パネルを配
設せしめたことを特徴とするものである。A liquid crystal display device according to a second aspect of the invention is characterized in that a liquid crystal panel is disposed on the other main surface side of the surface light source element having the above-mentioned structure via a light diffusing plate.
【0012】[0012]
【作用】請求項1の面光源素子によれば、長尺状光源
に、その外周における導光板と反対側に位置するほぼ半
分領域に光反射層を被覆した構成であって、この構成に
よれば、長尺状光源の照射光のほぼ半分が光反射層に到
り、しかも、この光反射層が光照射源に近くなるととも
に、その配置位置が長尺状光源の長手方向に沿って横断
面形状が湾曲した光反射面を有する従来の反射部材に比
べて、更に導光板に近づいている。According to the surface light source element of the present invention, the elongated light source has a structure in which the light reflection layer is coated on substantially the half region of the elongated light source located on the opposite side to the light guide plate. For example, almost half of the irradiation light of the elongated light source reaches the light reflection layer, and this light reflection layer is close to the light irradiation source, and its arrangement position is crossed along the longitudinal direction of the elongated light source. The light guide plate is closer to the light guide plate than the conventional reflection member having a light reflection surface whose surface shape is curved.
【0013】したがって、光反射層での反射光は、その
後の繰り返しの反射が少ないままで、導光板の端面に最
も入射し易くなり、これに伴って光減衰が小さくなり、
その分、導光板に多くの光が導入されるので、高い輝度
が得られる。Therefore, the light reflected by the light reflecting layer is most likely to be incident on the end face of the light guide plate with a small amount of repeated reflection thereafter, and the light attenuation is reduced accordingly.
Therefore, a large amount of light is introduced into the light guide plate, so that high brightness can be obtained.
【0014】請求項2によれば、上記発明の面光源素子
を搭載した構成により高輝度の高性能な液晶表示装置が
提供できる。According to the second aspect, it is possible to provide a high-performance and high-performance liquid crystal display device having the surface light source element of the present invention.
【0015】[0015]
【実施例】図1に本発明の面光源素子であるエッジライ
ト方式薄型照明装置8を液晶パネル2に配設した液晶表
示装置9の断面を示し、図2はその照明装置8の要部断
面図である。FIG. 1 shows a cross section of a liquid crystal display device 9 in which an edge light type thin lighting device 8 which is a surface light source element of the present invention is arranged on a liquid crystal panel 2. FIG. It is a figure.
【0016】この液晶表示装置9によれば、厚み4mm
のポリメチルメタアクリレート(PMMA)製矩形状導
光板10の一主面に光反射手段である東レ(株)製白色
ポリエステルの低発泡フィルムの反射板11を設けると
ともに、他主面にPETもしくはポリカーボネイト(P
C)製の光拡散板12を設け、しかも、この導光板10
の短軸一端面に沿って長尺円筒状光源13(管径3.8
mmの冷陰極型もしくは熱陰極型蛍光ランプ)を配設
し、その光源13の外周に銀を蒸着した反射部材である
反射板14が設けられている。この反射板14は図2に
示すように長尺円筒状光源13の長手方向に沿って横断
面形状が湾曲した反射面14aを有している。According to this liquid crystal display device 9, the thickness is 4 mm.
The light guide plate 10 made of Toray Co., Ltd., which is a low-foaming film of white polyester, is provided on one main surface of the rectangular light guide plate 10 made of polymethylmethacrylate (PMMA), and the other main surface is made of PET or polycarbonate. (P
A light diffusing plate 12 made of C) is provided, and the light guide plate 10 is also provided.
The long cylindrical light source 13 (tube diameter 3.8
mm cold-cathode type or hot-cathode type fluorescent lamp), and a light source 13 is provided with a reflection plate 14 which is a reflection member on which silver is vapor-deposited. As shown in FIG. 2, the reflecting plate 14 has a reflecting surface 14a whose transverse cross section is curved along the longitudinal direction of the elongated cylindrical light source 13.
【0017】また、導光板10の一主面には、前記輝度
を面状に高める調整手段として略全面に酸化チタンを添
加した白色及至乳白色系を呈するガラスビーズを含有す
る印刷パターン(図示せず)を多数高密度に分布するよ
うに形成し、更にその下面に反射板11を備えた構成で
あり、この構成により、照明装置8の輝度を高め、反射
板11にて反射された光を、より多く液晶パネル2側に
光出射することができる。In addition, on one main surface of the light guide plate 10, a printing pattern (not shown) containing glass beads having a white or milky white color in which titanium oxide is added to almost the entire surface as a means for adjusting the brightness in a planar manner. ) Are formed so as to be distributed in a high density, and a reflection plate 11 is further provided on the lower surface thereof. With this configuration, the brightness of the lighting device 8 is increased, and the light reflected by the reflection plate 11 is More light can be emitted to the liquid crystal panel 2 side.
【0018】更にまた、本実施例においては、光拡散板
12と液晶パネル2との間に住友3M(株)製商品名B
EF100のプリズムシート(図示せず)を介在させ、
更に輝度を高めるようにしている。Furthermore, in this embodiment, a product name B manufactured by Sumitomo 3M Co., Ltd. is provided between the light diffusion plate 12 and the liquid crystal panel 2.
The prism sheet (not shown) of EF100 is interposed,
The brightness is further increased.
【0019】そして、本発明においては、更に長尺円筒
状光源13の外周における導光板10と反対側に位置す
るほぼ半分領域に光反射層15を被覆している。この光
反射層15は銀を蒸着したフィルムシートから成り、そ
して、このフィルムシート上に形成した粘着剤でもって
蛍光ランプ上に被覆した。Further, in the present invention, the light reflecting layer 15 is further coated on a substantially half region of the outer periphery of the elongated cylindrical light source 13 located on the opposite side of the light guide plate 10. The light-reflecting layer 15 consisted of a silver-deposited film sheet and was coated on the fluorescent lamp with an adhesive formed on this film sheet.
【0020】かくして上記構成の照明装置8によれば、
この光反射層15が長尺円筒状光源13に直近するとと
もに、その配置位置が更に導光板10に近づくので、そ
の光反射層15での反射光は、その後の繰り返しの反射
が少ないままで、導光板10の端面に最も入射し易くな
り、これにより、導光板10に多くの光が導入されるの
で、高い輝度が得られた。Thus, according to the illumination device 8 having the above structure,
Since the light reflection layer 15 is located directly close to the elongated cylindrical light source 13 and the position of the light reflection layer 15 is further closer to the light guide plate 10, the reflected light on the light reflection layer 15 remains less reflected repeatedly thereafter. The light is most likely to be incident on the end surface of the light guide plate 10, whereby a large amount of light is introduced into the light guide plate 10, and thus high brightness is obtained.
【0021】本発明者は、この照明装置8を用いて、そ
の輝度(面内平均輝度)を測定したところ、4710c
d/m2 であった。これに対して、光反射層15がな
く、その他の構成が同じである従来の液晶表示装置1の
照明装置の場合には、輝度が4250cd/m2 であっ
た。したがって、本発明の照明装置8は、高い輝度が得
られたことが判る。The inventor of the present invention measured the luminance (in-plane average luminance) using the lighting device 8 and found that it was 4710c.
It was d / m 2 . On the other hand, in the case of the conventional illuminating device of the liquid crystal display device 1 which does not have the light reflecting layer 15 and has the same other configuration, the luminance was 4250 cd / m 2 . Therefore, it is understood that the illumination device 8 of the present invention has obtained high brightness.
【0022】次に図3と図4により他の実施例の照明装
置8aを詳述する。なお、図1および図2に示すものと
同一部材には同一符号を付す。Next, a lighting device 8a of another embodiment will be described in detail with reference to FIGS. The same members as those shown in FIGS. 1 and 2 are designated by the same reference numerals.
【0023】図3は、この照明装置8aを搭載した液晶
表示装置9aの一例であり、図4は照明装置8aの要部
拡大断面図である。これらの図に示す通り、導光板10
の一方の端面にのみ長尺円筒状光源13を置く1灯タイ
プのエッジライト方式であって、この導光板10の一端
面に沿って長尺円筒状光源13を配設し、同様に長尺円
筒状光源13の外周における導光板10と反対側に位置
するほぼ半分領域に光反射層15を被覆している。ま
た、導光板10の他端面にPET等から成る端面用反射
板16を設けている。FIG. 3 is an example of a liquid crystal display device 9a equipped with the lighting device 8a, and FIG. 4 is an enlarged cross-sectional view of a main part of the lighting device 8a. As shown in these figures, the light guide plate 10
This is a one-lamp type edge light system in which the long cylindrical light source 13 is placed only on one end surface of the light guide plate 10. The long cylindrical light source 13 is arranged along one end surface of the light guide plate 10, A light reflection layer 15 is coated on a substantially half region of the outer periphery of the cylindrical light source 13 located on the opposite side of the light guide plate 10. An end face reflection plate 16 made of PET or the like is provided on the other end face of the light guide plate 10.
【0024】かくして上記構成の照明装置8aにおいて
も、この光反射層15が長尺円筒状光源13に直近する
とともに、その配置位置が更に導光板10に近づくの
で、導光板10に多くの光が導入され、その上、導光板
10に入射した光は、光反射板11により反射されなが
ら、あるいは導光板10の他端面に到った光は、端面用
反射板16により反射し、多くの光が拡散板12を介し
て液晶パネル2を光照射し、その結果、高い輝度が得ら
れた。Thus, also in the illuminating device 8a having the above-mentioned structure, since the light reflecting layer 15 is located immediately adjacent to the elongated cylindrical light source 13 and the arrangement position thereof is further closer to the light guide plate 10, a large amount of light is emitted to the light guide plate 10. The light introduced and incident on the light guide plate 10 is reflected by the light reflection plate 11, or the light reaching the other end face of the light guide plate 10 is reflected by the end face reflection plate 16 and a large amount of light is emitted. Illuminates the liquid crystal panel 2 through the diffusion plate 12, and as a result, high brightness was obtained.
【0025】本発明者は、この照明装置8aを用いて、
その輝度(面内平均輝度)を測定したところ、2710
cd/m2 であった。これに対して、光反射層15がな
く、その他の構成は照明装置8aと同じである従来の照
明装置の場合には、輝度が2210cd/m2 であっ
た。したがって、本発明の照明装置8aは、高い輝度が
得られたことが判る。The present inventor uses the illumination device 8a to
The luminance (in-plane average luminance) was measured and found to be 2710
It was cd / m 2 . On the other hand, in the case of the conventional lighting device which does not have the light reflecting layer 15 and has the same structure as the lighting device 8a in other respects, the luminance was 2210 cd / m 2 . Therefore, it is understood that the illumination device 8a of the present invention can obtain high brightness.
【0026】尚、本発明は上記実施例に限定されるもの
ではなく、本発明の要旨を逸脱しない範囲内で種々の変
更、改良等は何ら差し支えない。例えば、上記実施例に
おいては、本発明の面光源素子を液晶表示装置に搭載し
た場合を例示したが、その他の面照射が要求される装置
(ELディスプレイ、プラズマディスプレイ、CRTデ
ィスプレイ等)にも搭載できる。あるいは上記実施例で
は、導光板の短軸一端面に沿って光源を配設している
が、導光板の長軸一端面に沿って光源を配設してもよ
い。The present invention is not limited to the above embodiments, and various modifications and improvements can be made without departing from the scope of the present invention. For example, in the above embodiment, the case where the surface light source element of the present invention is mounted on the liquid crystal display device is illustrated, but it is also mounted on other devices requiring surface irradiation (EL display, plasma display, CRT display, etc.). it can. Alternatively, in the above-described embodiment, the light source is arranged along the minor axis one end surface of the light guide plate, but the light source may be arranged along the major axis one end surface of the light guide plate.
【0027】[0027]
【発明の効果】以上のように、請求項1の面光源素子に
よれば、長尺状光源に、その外周における導光板と反対
側に位置するほぼ半分領域に光反射層を被覆しているの
で、長尺状光源の照射光のほぼ半分が光反射層に到り、
しかも、この光反射層が光照射源に近くなるとともに、
その配置位置が更に導光板に近づき、これにより、光減
衰が小さくなり、その分、導光板に多くの光が導入され
るので、高い輝度が得られ、その結果、カラー液晶表示
用やモノクロ液晶表示用の透過もしくは半透過タイプの
高輝度のエッジライト方式の面光源素子が提供できた。As described above, according to the surface light source element of the first aspect, the elongated light source is covered with the light reflection layer in a substantially half region located on the opposite side to the light guide plate on the outer periphery thereof. Therefore, almost half of the irradiation light from the long light source reaches the light reflection layer,
Moreover, this light reflecting layer becomes closer to the light irradiation source,
The arrangement position is further closer to the light guide plate, which reduces the light attenuation, and a large amount of light is introduced into the light guide plate accordingly, resulting in high brightness, and as a result, for color liquid crystal display or monochrome liquid crystal. A transparent or semi-transmissive type high-luminance edge light type surface light source element for display can be provided.
【0028】請求項2によれば、上記発明の面光源素子
を搭載した構成により高輝度の高性能な液晶表示装置、
例えばカラー液晶表示装置やモノクロ液晶表示装置が提
供できた。According to a second aspect of the present invention, a high-performance liquid crystal display device having a high brightness is provided by mounting the surface light source element of the present invention,
For example, a color liquid crystal display device and a monochrome liquid crystal display device could be provided.
【図1】実施例の液晶表示装置の断面概略図である。FIG. 1 is a schematic cross-sectional view of a liquid crystal display device of an example.
【図2】実施例の照明装置の要部断面図である。FIG. 2 is a cross-sectional view of the main parts of the lighting device of the embodiment.
【図3】他の実施例の液晶表示装置の断面概略図であ
る。FIG. 3 is a schematic cross-sectional view of a liquid crystal display device of another embodiment.
【図4】他の実施例の照明装置の要部断面図である。FIG. 4 is a cross-sectional view of a main part of a lighting device according to another embodiment.
【図5】従来例の液晶表示装置の断面概略図である。FIG. 5 is a schematic cross-sectional view of a conventional liquid crystal display device.
【図6】従来例の照明装置の要部断面図である。FIG. 6 is a sectional view of a main part of a conventional lighting device.
2 液晶パネル 8、8a 照明装置 10 導光板 12 光拡散板 13 長尺円筒状光源 11、14 反射板 15 光反射層 16 端面用反射板 2 Liquid Crystal Panels 8 and 8a Illuminating Device 10 Light Guide Plate 12 Light Diffusing Plate 13 Long Cylindrical Light Source 11, 14 Reflecting Plate 15 Light Reflecting Layer 16 End Face Reflecting Plate
Claims (2)
端面に長尺状光源を配設するとともに、この長尺状光源
の導光板と反対側のほぼ半外周領域に光反射層を被覆
し、上記長尺状光源の長手方向に沿って横断面形状が湾
曲した光反射面を有する反射部材を配設して、上記導光
板の他主面側より光出射するようにした面光源素子。1. A long light source is disposed on one end surface of a light guide plate having a light reflecting means provided on one main surface, and light is reflected in a substantially semi-peripheral region of the long light source opposite to the light guide plate. A reflecting member having a light reflecting surface covering the layer and having a cross-sectional shape curved along the longitudinal direction of the elongated light source is arranged to emit light from the other main surface side of the light guide plate. Surface light source element.
散板を介して液晶パネルを配設せしめた液晶表示装置。2. A liquid crystal display device in which a liquid crystal panel is arranged on the other main surface side of the surface light source element of claim 1 with a light diffusing plate interposed.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6232801A JPH0894847A (en) | 1994-09-28 | 1994-09-28 | Surface light source element and liquid crystal display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6232801A JPH0894847A (en) | 1994-09-28 | 1994-09-28 | Surface light source element and liquid crystal display device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0894847A true JPH0894847A (en) | 1996-04-12 |
Family
ID=16944981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6232801A Pending JPH0894847A (en) | 1994-09-28 | 1994-09-28 | Surface light source element and liquid crystal display device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0894847A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100682337B1 (en) * | 2000-03-16 | 2007-02-15 | 삼성전자주식회사 | LCD and manufacturing method for lamp reflector used for LCD |
-
1994
- 1994-09-28 JP JP6232801A patent/JPH0894847A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100682337B1 (en) * | 2000-03-16 | 2007-02-15 | 삼성전자주식회사 | LCD and manufacturing method for lamp reflector used for LCD |
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