JPH09281341A - Illuminator and liquid crystal display device using the same - Google Patents
Illuminator and liquid crystal display device using the sameInfo
- Publication number
- JPH09281341A JPH09281341A JP8112153A JP11215396A JPH09281341A JP H09281341 A JPH09281341 A JP H09281341A JP 8112153 A JP8112153 A JP 8112153A JP 11215396 A JP11215396 A JP 11215396A JP H09281341 A JPH09281341 A JP H09281341A
- Authority
- JP
- Japan
- Prior art keywords
- light
- guide plate
- light guide
- liquid crystal
- 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.)
- Pending
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は液晶テレビ等で用
いられる照明装置およびそれを用いた液晶表示装置に関
する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device used in a liquid crystal television or the like and a liquid crystal display device using the lighting device.
【０００２】[0002]
【従来の技術】液晶テレビ等で用いられる液晶表示装置
には、液晶表示パネル自体が自己発光能力を有していな
いので、液晶表示パネルの裏面側に照明装置を配置した
ものがある。図７および図８は従来のこのような液晶表
示装置を示したものである。この液晶表示装置では、液
晶表示パネル１の下面側に照明装置２が配置された構造
となっている。このうち液晶表示パネル１は、テレビ画
像等を表示するためのもので、詳細に図示していない
が、ガラス基板もしくは樹脂フィルム等からなる２枚の
透明基板間に液晶が封入されたものからなっている。2. Description of the Related Art Some liquid crystal display devices used in liquid crystal televisions and the like have an illuminating device arranged on the back side of the liquid crystal display panel because the liquid crystal display panel itself does not have a self-luminous ability. 7 and 8 show such a conventional liquid crystal display device. In this liquid crystal display device, the lighting device 2 is arranged on the lower surface side of the liquid crystal display panel 1. Of these, the liquid crystal display panel 1 is for displaying a television image or the like, and although not shown in detail, it is made up of a liquid crystal sealed between two transparent substrates made of a glass substrate or a resin film. ing.
【０００３】照明装置２は、上面が発光面となる導光板
３と、導光板３の下面側に配置された反射板４と、導光
板３の一端部に埋設された発光ダイオード（光源）５と
からなっている。このうち導光板３は、発光ダイオード
５からの光５ａを内部で反射させて上面を発光させるた
めのもので、ポリカーボネイト樹脂やアクリル樹脂等の
透明な樹脂からなっている。導光板３の上面および下面
はフレネル面等の凹凸面３ａに形成され、導光板３の厚
みは発光ダイオード５側から他方の側に向かうに従って
少しずつ薄くなるように形成されている（図８（Ｂ）参
照）。これにより、導光板３の上面および下面において
光が拡散されると共に、発光ダイオード５から遠ざかる
につれて光量が減少しても、それと共に導光板３の厚み
が薄くなることにより、導光板３の上面から発する光量
を上面全体にわたって均一化するようにしている。反射
板４は、導光板３の下面から光が漏れるのを防止するた
めのもので、アルミニウム等の金属からなっている。そ
して、導光板３の凹凸面３ａで拡散された光が液晶表示
パネル１の下面に照射されることになる。なお、導光板
３の上面における一点鎖線で囲まれた必要発光領域６は
液晶表示パネル１の照明に必要な発光領域である。The lighting device 2 has a light guide plate 3 whose upper surface serves as a light emitting surface, a reflector plate 4 arranged on the lower surface side of the light guide plate 3, and a light emitting diode (light source) 5 embedded in one end of the light guide plate 3. It consists of Of these, the light guide plate 3 is for internally reflecting the light 5a from the light emitting diode 5 to emit light from the upper surface, and is made of a transparent resin such as polycarbonate resin or acrylic resin. The upper surface and the lower surface of the light guide plate 3 are formed on the uneven surface 3a such as a Fresnel surface, and the thickness of the light guide plate 3 is formed so as to gradually decrease from the light emitting diode 5 side to the other side (FIG. 8 ( See B)). As a result, light is diffused on the upper surface and the lower surface of the light guide plate 3, and even if the amount of light decreases as the distance from the light emitting diode 5 increases, the thickness of the light guide plate 3 also decreases, so that from the upper surface of the light guide plate 3. The amount of light emitted is made uniform over the entire upper surface. The reflection plate 4 is for preventing light from leaking from the lower surface of the light guide plate 3, and is made of metal such as aluminum. Then, the light diffused by the uneven surface 3 a of the light guide plate 3 is applied to the lower surface of the liquid crystal display panel 1. The required light emitting region 6 surrounded by the alternate long and short dash line on the upper surface of the light guide plate 3 is a light emitting region required for illumination of the liquid crystal display panel 1.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、従来の
このような液晶表示装置では、導光板３の一端部に発光
ダイオード５が配置されているので、発光ダイオード５
から照射された光５ａのうち一部が、図８（Ａ）および
（Ｂ）の矢印で示すように、導光板３の上面および下面
の凹凸面３ａで拡散されずに必要発光領域６下を通過し
て導光板３の端面から出射されることがあり、光の利用
効率が悪いという問題があった。この場合、光の利用効
率が悪い分、発光ダイオード５の輝度を上げて補うこと
になり、消費電力が多くなり、例えば電源に電池を使用
する場合、電池の占める容積や重量が増加して、照明装
置の容積や重量が増加することになる。この発明の課題
は、光の利用効率を向上させることができるようにする
ことである。However, in such a conventional liquid crystal display device, since the light emitting diode 5 is arranged at one end of the light guide plate 3, the light emitting diode 5 is not provided.
8A and 8B, a part of the light 5a emitted from is not diffused by the uneven surfaces 3a on the upper surface and the lower surface of the light guide plate 3 and is emitted below the necessary light emitting region 6. The light may pass through and be emitted from the end surface of the light guide plate 3, which causes a problem of low light utilization efficiency. In this case, since the light use efficiency is low, the brightness of the light emitting diode 5 is increased to compensate, and power consumption increases. For example, when a battery is used as a power source, the volume and weight occupied by the battery increase, This will increase the volume and weight of the lighting device. An object of the present invention is to improve the light utilization efficiency.
【０００５】[0005]
【課題を解決するための手段】請求項１記載の発明は、
上面が発光面となる導光板と、該導光板の下面に設けら
れた反射板と、前記導光板の周縁部の少なくとも一端に
設けられた光源とを備えた照明装置において、前記導光
板の上面または下面における周縁部であって、前記光源
を除く部分に光反射用溝を設けたものである。請求項２
記載の発明は、上面が発光面となる導光板と、該導光板
の下面に設けられた反射板と、前記導光板の周縁部の少
なくとも一端に設けられた光源とを備えた照明装置にお
いて、前記導光板の上面および下面における周縁部であ
って、前記光源を除く部分にそれぞれ光反射用溝を互い
に平行するように設けたものである。請求項６記載の発
明は、上面が発光面となる導光板と、該導光板の下面に
設けられた反射板と、前記導光板の周縁部の少なくとも
一端に配置された光源と、前記導光板の上面に設けられ
た液晶表示パネルとを備えた液晶表示装置において、前
記導光板の上面または下面における周縁部であって、前
記光源の配置側を除く部分に光反射用溝を設けものであ
る。請求項７記載の発明は、上面が発光面となる導光板
と、該導光板の下面に設けられた反射板と、前記導光板
の周縁部の少なくとも一端に配置された光源と、前記導
光板の上面に設けられた液晶表示パネルとを備えた液晶
表示装置において、前記導光板の上面および下面におけ
る周縁部であって、前記光源の配置側を除く部分にそれ
ぞれ光反射用溝を互いに平行するように設けたものであ
る。According to the first aspect of the present invention,
In a lighting device including a light guide plate having an upper surface as a light emitting surface, a reflection plate provided on a lower surface of the light guide plate, and a light source provided at least at one end of a peripheral portion of the light guide plate, an upper surface of the light guide plate. Alternatively, a light reflection groove is provided in the peripheral portion of the lower surface except the light source. Claim 2
The invention described above, in a lighting device comprising a light guide plate having an upper surface as a light emitting surface, a reflection plate provided on a lower surface of the light guide plate, and a light source provided at least at one end of a peripheral portion of the light guide plate, Light reflection grooves are provided so as to be parallel to each other on the upper and lower peripheral portions of the light guide plate except the light source. According to a sixth aspect of the present invention, a light guide plate having an upper surface serving as a light emitting surface, a reflection plate provided on a lower surface of the light guide plate, a light source arranged at least at one end of a peripheral portion of the light guide plate, and the light guide plate. In a liquid crystal display device including a liquid crystal display panel provided on the upper surface of the light guide plate, a light reflection groove is provided on a peripheral portion of the upper surface or the lower surface of the light guide plate, excluding the arrangement side of the light source. . According to a seventh aspect of the present invention, a light guide plate having an upper surface serving as a light emitting surface, a reflection plate provided on a lower surface of the light guide plate, a light source arranged at least at one end of a peripheral portion of the light guide plate, and the light guide plate. A liquid crystal display device provided with a liquid crystal display panel provided on the upper surface of the light guide plate, the light reflecting grooves being parallel to each other at the peripheral portions on the upper surface and the lower surface of the light guide plate except the arrangement side of the light source. It is provided as follows.
【０００６】請求項１または６記載の発明によれば、導
光板の上面または下面における周縁部であって、光源の
配置側を除く部分に光反射用溝を設けたので、光源から
の光が導光板によって拡散されずに直進する場合でも、
光源からの光が光反射用溝によって内側に反射され、導
光板の端面から出射される光量を少なくすることがで
き、光の利用効率を向上させることができる。請求項２
または７記載の発明によれば、導光板の上面および下面
における周縁部であって、光源の配置側を除く部分にそ
れぞれ光反射用溝を互いに平行するように設けたので、
光源からの光が導光板によって拡散されずに直進する場
合でも、光源からの光が各光反射用溝によって内側に反
射され、導光板の端面から出射される光量を少なくする
ことができ、光の利用効率を向上させることができる。According to the invention described in claim 1 or 6, since the light reflection groove is provided in the peripheral portion on the upper surface or the lower surface of the light guide plate except the arrangement side of the light source, the light from the light source is Even if you go straight without being diffused by the light guide plate,
The light from the light source is reflected inward by the light reflection groove, the amount of light emitted from the end surface of the light guide plate can be reduced, and the light utilization efficiency can be improved. Claim 2
Alternatively, according to the invention described in 7, since the light reflection grooves are provided so as to be parallel to each other in the peripheral portions on the upper surface and the lower surface of the light guide plate except the arrangement side of the light source,
Even when the light from the light source goes straight without being diffused by the light guide plate, the light from the light source is reflected inward by each light reflection groove, and the amount of light emitted from the end surface of the light guide plate can be reduced. The utilization efficiency of can be improved.
【０００７】[0007]
【発明の実施の形態】以下、図１〜図３を参照して、こ
の発明における液晶表示装置の第１実施形態について説
明する。ここで、図１はこの液晶表示装置の斜視図であ
り、図２（Ａ）は同液晶表示装置の平面図であり、図２
（Ｂ）はそのＢ−Ｂ線に沿う断面図であり、図３（Ａ）
および（Ｂ）は同液晶表示装置の一部の断面図である。
これらの図において、図７および図８と同一名称部分に
は同一の符号を付し、その説明を適宜省略する。この液
晶表示装置では、図１および図２（Ａ）に示すように、
導光板３の周縁部の一端（同図では手前端）、つまり必
要発光領域６の手前側に発光ダイオード（光源）５が埋
設されて配置され、導光板３の上面における周縁部であ
って発光ダイオード５が配置された側を除く部分、つま
り必要発光領域６の左側、奥側、および右側に連続して
平面コ字状の上側光反射用溝１１が設けられ、導光板３
の下面における周縁部であって上側光反射用溝１１に対
応する部分の外側の部分に上側光反射用溝１１に平行し
て下側光反射用溝１２が設けられている。また、図３
（Ａ）に示すように、上側光反射用溝１１の内面のうち
内側に位置する内側面は垂直面に対して内側にθ1傾斜
し、下側光反射用溝１２の内面のうち内側に位置する内
側面は垂直面に対して内側にθ2傾斜している。BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of a liquid crystal display device according to the present invention will be described below with reference to FIGS. Here, FIG. 1 is a perspective view of the liquid crystal display device, and FIG. 2A is a plan view of the liquid crystal display device.
3B is a sectional view taken along the line BB, and FIG.
And (B) are partial cross-sectional views of the liquid crystal display device.
In these figures, parts having the same names as those in FIGS. 7 and 8 are designated by the same reference numerals, and the description thereof will be omitted as appropriate. In this liquid crystal display device, as shown in FIG. 1 and FIG.
A light emitting diode (light source) 5 is embedded and arranged at one end (front end in the figure) of the light guide plate 3, that is, on the front side of the required light emitting region 6, and light is emitted at the peripheral portion on the upper surface of the light guide plate 3. A planar U-shaped upper light reflection groove 11 is continuously provided on a portion other than the side where the diode 5 is arranged, that is, on the left side, the back side, and the right side of the necessary light emitting region 6, and the light guide plate 3 is provided.
A lower light reflecting groove 12 is provided in parallel with the upper light reflecting groove 11 at a peripheral portion of the lower surface of the outer peripheral portion of the portion corresponding to the upper light reflecting groove 11. Also, FIG.
As shown in (A), the inner side surface of the inner surface of the upper light reflection groove 11 positioned inside is inclined by θ 1 inward with respect to the vertical surface, and the inner side surface of the inner surface of the lower light reflection groove 12 is disposed inside. The inner surface located is inclined inward by θ 2 with respect to the vertical surface.
【０００８】このように、この液晶表示装置では、導光
板３の上面における周縁部であって発光ダイオード５が
配置された側を除く部分に上側光反射用溝１１が設けら
れ、導光板３の下面における周縁部であって上側光反射
用溝１１に対応する部分の外側の部分に上側光反射用溝
１１に平行して下側光反射用溝１２が設けられているの
で、発光ダイオード５からの光５ａが導光板３の上面ま
たは下面の凹凸面３ａによって拡散されずに必要発光領
域６下を通過する場合でも、図３（Ａ）に示すように、
発光ダイオード５からの光５ａが上側光反射用溝１１の
内面のうち内側に位置する内側面によって内側に反射さ
れて必要発光領域６下に戻され、あるいは図３（Ｂ）に
示すように、発光ダイオード５からの光５ａが下側光反
射用溝１２の内面のうち内側に位置する内側面および上
側光反射用溝１１の底面によって内側に反射されて必要
発光領域６下に戻され、導光板３の端面から出射される
光量を少なくすることができ、光の利用効率を向上させ
ることができる。したがって、図７および図８に示す従
来の照明装置２よりも少ない消費電力で同様の光量を得
ることができ、消費電力を低減することができ、例えば
電源に電池を使用する場合、電池の占める容積や重量を
低減することができ、ひいては照明装置の容積や重量を
低減することができる。また、上側光反射用溝１１の内
面のうち内側に位置する内側面が垂直面に対して内側に
θ1傾斜し、下側光反射用溝１２の内面のうち内側に位
置する内側面が垂直面に対して内側にθ2傾斜している
ので、凹凸面３ａによって拡散されずに直進してきた発
光ダイオード５からの光５ａを導光板３の上面または下
面の凹凸面３ａに向けて反射させることができ、より一
層光の利用効率を向上させることができる。また、発光
ダイオード５からの光５ａが光反射用溝１１、１２によ
って反射されて発光ダイオード５が配置された側以外の
方向から必要発光領域６下に戻されるので、導光板３の
必要発光領域６から発する光量を必要発光領域６全体に
わたってより一層均一化することができる。As described above, in this liquid crystal display device, the upper light reflection groove 11 is provided in the peripheral portion of the upper surface of the light guide plate 3 except the side where the light emitting diode 5 is arranged, and the light guide plate 3 is provided with the upper light reflection groove 11. Since the lower light-reflecting groove 12 is provided in parallel with the upper light-reflecting groove 11 at a peripheral portion of the lower surface and outside the portion corresponding to the upper light-reflecting groove 11, Even when the light 5a of FIG. 3A passes under the required light emitting region 6 without being diffused by the uneven surface 3a on the upper surface or the lower surface of the light guide plate 3, as shown in FIG.
The light 5a from the light emitting diode 5 is reflected inward by the inner side surface of the inner surface of the upper light reflection groove 11 and is returned below the necessary light emitting region 6, or as shown in FIG. The light 5a from the light emitting diode 5 is reflected inward by the inner side surface of the inner surface of the lower light reflection groove 12 and the bottom surface of the upper light reflection groove 11, and is returned to the lower side of the required light emitting region 6 and guided. The amount of light emitted from the end surface of the light plate 3 can be reduced, and the light utilization efficiency can be improved. Therefore, a similar amount of light can be obtained with less power consumption than the conventional lighting device 2 shown in FIGS. 7 and 8, and the power consumption can be reduced. For example, when a battery is used as a power source, the battery occupies It is possible to reduce the volume and the weight of the lighting device. The inner side surface of the inner surface of the upper light reflection groove 11 is inclined inward by θ 1 with respect to the vertical plane, and the inner side surface of the inner surface of the lower light reflection groove 12 is vertical. Since the light is inclined θ 2 inward with respect to the surface, the light 5 a from the light emitting diode 5 which has not traveled by the uneven surface 3 a and has gone straight is reflected toward the uneven surface 3 a on the upper surface or the lower surface of the light guide plate 3. Therefore, it is possible to further improve the light utilization efficiency. Further, since the light 5a from the light emitting diode 5 is reflected by the light reflecting grooves 11 and 12 and returned to the lower side of the required light emitting region 6 from the direction other than the side where the light emitting diode 5 is arranged, the required light emitting region of the light guide plate 3 is obtained. The amount of light emitted from 6 can be made more uniform over the entire required light emitting region 6.
【０００９】図４（Ａ）および（Ｂ）はこの発明におけ
る液晶表示装置の第１実施形態の変形例を示したもので
ある。この液晶表示装置では、上側光反射用溝１１の内
面のうち内側に位置する内側面から底面にわたって反射
部材１３が設けられ、下側光反射用溝１２の内面のうち
内側に位置する内側面から導光板３の下面における上側
光反射用溝１１に対応する部分にわたって反射部材１４
が設けられている。これらの反射部材１３、１４は、ア
ルミニウム等の金属を蒸着等の方法により被膜させて鏡
面状としたものからなっている。このように、この液晶
表示装置では、上側および下側光反射用溝１１、１２の
内面のうち少なくとも内側に位置する各内側面に反射部
材１３、１４が設けられているので、上側および下側光
反射用溝１１、１２における光５ａの反射効率を向上さ
せることができ、より一層光の利用効率を向上させるこ
とができる。FIGS. 4A and 4B show a modification of the first embodiment of the liquid crystal display device according to the present invention. In this liquid crystal display device, the reflecting member 13 is provided from the inner side surface of the inner surface of the upper light reflection groove 11 to the bottom surface, and the inner side surface of the inner surface of the lower light reflection groove 12 is disposed. The reflection member 14 extends over the portion of the lower surface of the light guide plate 3 corresponding to the upper light reflection groove 11.
Is provided. These reflecting members 13 and 14 are made of a metal such as aluminum and are mirror-finished by coating such as vapor deposition. As described above, in this liquid crystal display device, since the reflecting members 13 and 14 are provided on the inner side surfaces located at least inside of the inner surfaces of the upper and lower light reflecting grooves 11 and 12, the upper and lower sides are provided. The reflection efficiency of the light 5a in the light reflection grooves 11 and 12 can be improved, and the light utilization efficiency can be further improved.
【００１０】次に、図５および図６を参照して、この発
明における液晶表示装置の第２実施形態について説明す
る。ここで、図５はこの液晶表示装置の斜視図であり、
図６（Ａ）は同液晶表示装置の平面図であり、図６
（Ｂ）は図６（Ａ）のＢ−Ｂ線に沿う断面図である。こ
れらの図において、図７および図８と同一名称部分には
同一の符号を付し、その説明を適宜省略する。この液晶
表示装置では、導光板３の周縁部の両端（同図では左端
および右端）、つまり必要発光領域６の左側および右側
にそれぞれ発光ダイオード（光源）５、５が埋設されて
配置され、導光板３の上面における周縁部であって発光
ダイオード５、５が配置された側を除く部分、つまり必
要発光領域６の奥側および手前側にそれぞれ直線状の上
側光反射用溝２１、２２が設けられ、導光板３の下面に
おける周縁部であって上側光反射用溝２１、２２に対応
する部分の外側の部分にそれぞれ上側光反射用溝２１、
２２に平行して下側光反射用溝２３、２４が設けられて
いる。このように、この液晶表示装置では、導光板３の
上面における周縁部であって発光ダイオード５、５が配
置された側を除く部分にそれぞれ上側光反射用溝２１、
２２が設けられ、導光板３の下面における周縁部であっ
て上側光反射用溝２１、２２に対応する部分の外側の部
分にそれぞれ上側光反射用溝２１、２２に平行して下側
光反射用溝２３、２４が設けられているので、発光ダイ
オード５、５からの光５ａが導光板３の上面または下面
の凹凸面３ａによって拡散されずに必要発光領域６下を
通過する場合でも、発光ダイオード５、５からの光５ａ
が上側光反射用溝２１、２２の内面のうち内側に位置す
る内側面によって内側に反射されて必要発光領域６下に
戻され、あるいは発光ダイオード５、５からの光５ａが
下側光反射用溝２３、２４の内面のうち内側に位置する
内側面によって内側に反射されて必要発光領域６下に戻
され、導光板３の端面から出射される光量を少なくする
ことができ、光の利用効率を向上させることができる。
また、発光ダイオード５からの光５ａが光反射用溝２１
〜２４によって反射されて発光ダイオード５以外の方向
から必要発光領域６下に戻されるので、導光板３の必要
発光領域６から発する光量を必要発光領域６全体にわた
ってより一層均一化することができる。Next, a second embodiment of the liquid crystal display device according to the present invention will be described with reference to FIGS. 5 and 6. Here, FIG. 5 is a perspective view of the liquid crystal display device,
FIG. 6A is a plan view of the liquid crystal display device.
FIG. 7B is a cross-sectional view along the line BB in FIG. In these figures, parts having the same names as those in FIGS. 7 and 8 are designated by the same reference numerals, and the description thereof will be omitted as appropriate. In this liquid crystal display device, light emitting diodes (light sources) 5 and 5 are embedded and arranged at both ends (left end and right end in the figure) of the light guide plate 3, that is, on the left side and the right side of the required light emitting region 6, respectively. Linear upper grooves 21 and 22 are provided on the upper surface of the light plate 3 except for the side where the light emitting diodes 5 and 5 are arranged, that is, on the back side and the front side of the required light emitting region 6, respectively. The upper light reflection groove 21, is provided on the peripheral portion of the lower surface of the light guide plate 3 outside the portions corresponding to the upper light reflection grooves 21, 22.
The lower light reflecting grooves 23 and 24 are provided in parallel with 22. As described above, in this liquid crystal display device, the upper light reflection groove 21 is formed in the peripheral portion of the upper surface of the light guide plate 3 except the side where the light emitting diodes 5 and 5 are arranged, respectively.
22 is provided, which is a peripheral portion of the lower surface of the light guide plate 3 outside the portions corresponding to the upper light reflection grooves 21 and 22 and in parallel with the upper light reflection grooves 21 and 22, respectively. Since the use grooves 23 and 24 are provided, even when the light 5a from the light emitting diodes 5 and 5 passes under the necessary light emitting region 6 without being diffused by the uneven surface 3a on the upper surface or the lower surface of the light guide plate 3, the light is emitted. Light 5a from the diodes 5 and 5
Is reflected inward by the inner side surface of the inner surface of the upper light reflection grooves 21 and 22 and is returned to the lower side of the required light emitting region 6, or the light 5a from the light emitting diodes 5, 5 is used for lower light reflection. It is possible to reduce the amount of light emitted from the end surface of the light guide plate 3 by being reflected inward by the inner side surface located inside of the grooves 23 and 24 and returned to the lower side of the required light emitting region 6, and the light utilization efficiency is improved. Can be improved.
In addition, the light 5 a from the light emitting diode 5 is reflected by the light reflecting groove 21.
Since the light emitted from the necessary light emitting area 6 of the light guide plate 3 is reflected by the light emitting elements 24 to 24 and is returned to the lower side of the necessary light emitting area 6 from the direction other than the light emitting diode 5, it is possible to further equalize the amount of light emitted over the entire necessary light emitting area 6.
【００１１】なお、上記第１〜第２実施形態では、光反
射用溝１１、１２、２１〜２４の内面を平滑に形成した
が、これに限らず、例えば光反射用溝１１、１２、２１
〜２４の内面のうち少なくとも内側に位置する内側面を
フレネル面等の凹凸面に形成してもよい。この場合、光
反射用溝１１、１２、２１〜２４における光５ａの反射
効率を向上させることができ、より一層光の利用効率を
向上させることができる。また、上記第１〜第２実施形
態では、上側光反射用溝１１、２１、２２を下側光反射
用溝１２、２３、２４よりも内側に設けたが、逆に下側
光反射用溝１２、２３、２４を上側光反射用溝１１、２
１、２２よりも内側に設けるようにしてもよい。また、
上記第１〜第２実施形態では、光反射用溝１１、１２、
２１〜２４を導光板３の両面に設けたが、これに限ら
ず、導光板３のいずれか一方の面に設ければよい。さら
に、上記第１〜第２実施形態では、光源として発光ダイ
オード５を用いたが、これに限らず、例えば蛍光管、電
球、ＥＬ（エレクトロルミネッセンス）素子等を用いて
もよい。Although the inner surfaces of the light reflecting grooves 11, 12, 21 to 24 are formed to be smooth in the first to second embodiments, the invention is not limited to this, and for example, the light reflecting grooves 11, 12, 21 may be formed.
At least the inner side surface of the inner surfaces of 24 to 24 may be formed as an uneven surface such as a Fresnel surface. In this case, the reflection efficiency of the light 5a in the light reflection grooves 11, 12, 21 to 24 can be improved, and the light utilization efficiency can be further improved. Further, in the first to second embodiments, the upper light reflecting grooves 11, 21, 22 are provided inside the lower light reflecting grooves 12, 23, 24, but conversely, the lower light reflecting grooves are provided. 12, 23, and 24 are upper light reflection grooves 11, 2
You may make it provide inside 1 and 22. Also,
In the above-described first and second embodiments, the light reflection grooves 11, 12,
Although 21 to 24 are provided on both surfaces of the light guide plate 3, the present invention is not limited to this and may be provided on any one surface of the light guide plate 3. Further, although the light emitting diode 5 is used as the light source in the first to second embodiments, the light source is not limited to this, and for example, a fluorescent tube, a light bulb, an EL (electroluminescence) element, or the like may be used.
【００１２】[0012]
【発明の効果】以上説明したように、請求項１または６
記載の発明によれば、導光板の上面または下面における
周縁部であって、光源の配置側を除く部分に光反射用溝
を設けたので、光源からの光が導光板によって拡散され
ずに直進する場合でも、光源からの光が光反射用溝によ
って内側に反射され、導光板の端面から出射される光量
を少なくすることができ、光の利用効率を向上させるこ
とができる。請求項２または７記載の発明によれば、導
光板の上面および下面における周縁部であって、光源の
配置側を除く部分に互いに平行するように光反射用溝を
それぞれ設けたので、光源からの光が導光板によって拡
散されずに直進する場合でも、光源からの光が各光反射
用溝によって内側に反射され、導光板の端面から出射さ
れる光量を少なくすることができ、光の利用効率を向上
させることができる。As described above, according to claim 1 or 6,
According to the invention described above, since the light reflection groove is provided in the peripheral portion on the upper surface or the lower surface of the light guide plate except for the light source arrangement side, the light from the light source goes straight without being diffused by the light guide plate. Even in this case, the light from the light source is reflected inward by the light reflection groove, and the amount of light emitted from the end surface of the light guide plate can be reduced, and the light utilization efficiency can be improved. According to the invention described in claim 2 or 7, since the light reflection grooves are provided so as to be parallel to each other at the peripheral portions on the upper surface and the lower surface of the light guide plate except the arrangement side of the light source, Even when the light from the light source travels straight without being diffused by the light guide plate, the light from the light source is reflected inward by each light reflection groove, and the amount of light emitted from the end surface of the light guide plate can be reduced. The efficiency can be improved.
【図１】この発明の第１実施形態における液晶表示装置
の斜視図。FIG. 1 is a perspective view of a liquid crystal display device according to a first embodiment of the present invention.
【図２】（Ａ）は同液晶表示装置の平面図、（Ｂ）はそ
のＢ−Ｂ線に沿う断面図。FIG. 2A is a plan view of the liquid crystal display device, and FIG. 2B is a sectional view taken along line BB thereof.
【図３】（Ａ）および（Ｂ）は同液晶表示装置の一部の
断面図。3A and 3B are cross-sectional views of a part of the liquid crystal display device.
【図４】（Ａ）および（Ｂ）は第１実施形態における液
晶表示装置の変形例の断面図。4A and 4B are cross-sectional views of a modification of the liquid crystal display device according to the first embodiment.
【図５】この発明の第２実施形態における液晶表示装置
の斜視図。FIG. 5 is a perspective view of a liquid crystal display device according to a second embodiment of the present invention.
【図６】（Ａ）は同液晶表示装置の平面図、（Ｂ）はそ
のＢ−Ｂ線に沿う断面図。FIG. 6A is a plan view of the liquid crystal display device, and FIG. 6B is a sectional view taken along line BB thereof.
【図７】従来の液晶表示装置の斜視図。FIG. 7 is a perspective view of a conventional liquid crystal display device.
【図８】（Ａ）は同液晶表示装置の平面図、（Ｂ）はそ
のＢ−Ｂ線に沿う断面図。FIG. 8A is a plan view of the liquid crystal display device, and FIG. 8B is a cross-sectional view taken along line BB thereof.
１ 液晶表示パネル ２ 照明装置 ３ 導光板 ４ 反射板 ５ 発光ダイオード（光源） １１、１２ 光反射用溝 DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Illumination device 3 Light guide plate 4 Reflector plate 5 Light emitting diode (light source) 11, 12 Light reflection groove
Claims (8)
の下面に設けられた反射板と、前記導光板の周縁部の少
なくとも一端に配置された光源とを備えた照明装置にお
いて、 前記導光板の上面または下面における周縁部であって、
前記光源の配置側を除く部分に光反射用溝を設けたこと
を特徴とする照明装置。1. A lighting device comprising a light guide plate having an upper surface serving as a light emitting surface, a reflection plate provided on a lower surface of the light guide plate, and a light source arranged at least at one end of a peripheral portion of the light guide plate. A peripheral portion on the upper surface or the lower surface of the light guide plate,
An illumination device, wherein a light reflecting groove is provided in a portion other than the side where the light source is arranged.
の下面に設けられた反射板と、前記導光板の周縁部の少
なくとも一端に配置された光源とを備えた照明装置にお
いて、 前記導光板の上面および下面における周縁部であって、
前記光源の配置側を除く部分にそれぞれ光反射用溝を互
いに平行するように設けたことを特徴とする照明装置。2. A lighting device comprising: a light guide plate having an upper surface serving as a light emitting surface; a reflection plate provided on the lower surface of the light guide plate; and a light source arranged at least at one end of a peripheral portion of the light guide plate. Peripheral portions on the upper surface and the lower surface of the light guide plate,
An illuminating device, characterized in that light reflecting grooves are provided so as to be parallel to each other except for the side where the light sources are arranged.
する内側面を垂直面に対して内側に傾斜させたことを特
徴とする請求項１または２記載の照明装置。3. The illumination device according to claim 1, wherein an inner side surface of the inner surface of the light reflecting groove, which is located on the inner side, is inclined inward with respect to a vertical surface.
内側に位置する内側面を凹凸面に形成したことを特徴と
する請求項１〜３のいずれかに記載の照明装置。4. The illumination device according to claim 1, wherein at least an inner side surface of the inner surface of the light reflecting groove is formed as an uneven surface.
内側に位置する内側面に反射部材を設けたことを特徴と
する請求項１〜４のいずれかに記載の照明装置。5. The illuminating device according to claim 1, wherein a reflecting member is provided on at least an inner surface of the inner surface of the light reflecting groove, the inner surface being located inside.
の下面に設けられた反射板と、前記導光板の周縁部の少
なくとも一端に配置された光源と、前記導光板の上面に
設けられた液晶表示パネルとを備えた液晶表示装置にお
いて、 前記導光板の上面または下面における周縁部であって、
前記光源の配置側を除く部分に光反射用溝を設けたこと
を特徴とする液晶表示装置。6. A light guide plate having an upper surface serving as a light emitting surface, a reflection plate provided on a lower surface of the light guide plate, a light source arranged at least at one end of a peripheral portion of the light guide plate, and an upper surface of the light guide plate. In a liquid crystal display device provided with a liquid crystal display panel provided, a peripheral portion on the upper surface or the lower surface of the light guide plate,
A liquid crystal display device, characterized in that a groove for light reflection is provided in a portion excluding the side where the light source is arranged.
の下面に設けられた反射板と、前記導光板の周縁部の少
なくとも一端に配置された光源と、前記導光板の上面に
設けられた液晶表示パネルとを備えた液晶表示装置にお
いて、 前記導光板の上面および下面における周縁部であって、
前記光源の配置側を除く部分にそれぞれ光反射用溝を互
いに平行するように設けたことを特徴とする液晶表示装
置。7. A light guide plate having an upper surface serving as a light emitting surface, a reflection plate provided on the lower surface of the light guide plate, a light source arranged at least at one end of a peripheral portion of the light guide plate, and an upper surface of the light guide plate. In a liquid crystal display device provided with a liquid crystal display panel provided, in the peripheral portion on the upper surface and the lower surface of the light guide plate,
A liquid crystal display device, wherein light reflection grooves are provided in parallel with each other in a portion other than the light source arrangement side.
置の上面に液晶表示パネルを設けたことを特徴とする液
晶表示装置。8. A liquid crystal display device, comprising a liquid crystal display panel on the upper surface of the lighting device according to claim 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8112153A JPH09281341A (en) | 1996-04-10 | 1996-04-10 | Illuminator and liquid crystal display device using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8112153A JPH09281341A (en) | 1996-04-10 | 1996-04-10 | Illuminator and liquid crystal display device using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09281341A true JPH09281341A (en) | 1997-10-31 |
Family
ID=14579568
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8112153A Pending JPH09281341A (en) | 1996-04-10 | 1996-04-10 | Illuminator and liquid crystal display device using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09281341A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098838A (en) * | 2000-07-19 | 2002-04-05 | Sanyo Electric Co Ltd | Rod-like light guide body, linear illumination device which uses the same and surface illumination device which uses the linear illumination device |
| KR100806121B1 (en) * | 2001-09-29 | 2008-02-22 | 삼성전자주식회사 | Light guided panel and liquid crystal display device using the same |
| JP2008226844A (en) * | 2007-03-14 | 2008-09-25 | Samsung Electronics Co Ltd | Waveguide member and keypad assembly using this waveguide member |
| JP2009004262A (en) * | 2007-06-22 | 2009-01-08 | Minebea Co Ltd | Planar lighting system and its transparent resin substrate and injection molding method of transparent resin substrate |
| JP2009043663A (en) * | 2007-08-10 | 2009-02-26 | Minebea Co Ltd | Planar luminaire |
| JP2010257910A (en) * | 2009-04-28 | 2010-11-11 | Fujikura Ltd | Sheet switch module |
| CN103293590A (en) * | 2013-05-22 | 2013-09-11 | 苏州达方电子有限公司 | Light guide plate |
| WO2017078030A1 (en) * | 2015-11-02 | 2017-05-11 | 北陸電気工業株式会社 | Backlight module |
-
1996
- 1996-04-10 JP JP8112153A patent/JPH09281341A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002098838A (en) * | 2000-07-19 | 2002-04-05 | Sanyo Electric Co Ltd | Rod-like light guide body, linear illumination device which uses the same and surface illumination device which uses the linear illumination device |
| KR100806121B1 (en) * | 2001-09-29 | 2008-02-22 | 삼성전자주식회사 | Light guided panel and liquid crystal display device using the same |
| JP2008226844A (en) * | 2007-03-14 | 2008-09-25 | Samsung Electronics Co Ltd | Waveguide member and keypad assembly using this waveguide member |
| US7959342B2 (en) | 2007-03-14 | 2011-06-14 | Samsung Electronics Co., Ltd. | Waveguide member and keypad assembly using the same |
| JP2011204686A (en) * | 2007-03-14 | 2011-10-13 | Samsung Electronics Co Ltd | Wave guide member and keypad assembly using the same |
| US8052318B2 (en) | 2007-03-14 | 2011-11-08 | Samsung Electronics Co., Ltd. | Light guide member and keypad assembly using the same |
| JP2009004262A (en) * | 2007-06-22 | 2009-01-08 | Minebea Co Ltd | Planar lighting system and its transparent resin substrate and injection molding method of transparent resin substrate |
| JP2009043663A (en) * | 2007-08-10 | 2009-02-26 | Minebea Co Ltd | Planar luminaire |
| JP2010257910A (en) * | 2009-04-28 | 2010-11-11 | Fujikura Ltd | Sheet switch module |
| CN103293590A (en) * | 2013-05-22 | 2013-09-11 | 苏州达方电子有限公司 | Light guide plate |
| WO2017078030A1 (en) * | 2015-11-02 | 2017-05-11 | 北陸電気工業株式会社 | Backlight module |
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