JP2000331522A - Lighting system and liquid crystal display device - Google Patents
Lighting system and liquid crystal display deviceInfo
- Publication number
- JP2000331522A JP2000331522A JP11140873A JP14087399A JP2000331522A JP 2000331522 A JP2000331522 A JP 2000331522A JP 11140873 A JP11140873 A JP 11140873A JP 14087399 A JP14087399 A JP 14087399A JP 2000331522 A JP2000331522 A JP 2000331522A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light guide
- reflecting
- lighting device
- incident
- 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.)
- Withdrawn
Links
Landscapes
- Liquid Crystal (AREA)
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
- Planar Illumination Modules (AREA)
- Light Guides In General And Applications Therefor (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、照明装置と液晶表
示装置に関し、特に、パーソナルコンピュータや携帯情
報端末、小型テレビなどに用いられる反射型液晶表示装
置などに使用される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 lighting device and a liquid crystal display device, and more particularly to a lighting device used for a reflection type liquid crystal display device used for a personal computer, a portable information terminal, a small television, and the like. .
【０００２】[0002]
【従来の技術】近年パーソナルコンピュータや携帯情報
端末は、小型化、ポータブル化が進んでおり、画像表示
装置の消費電力低減が重要な課題となっている。このた
め、画像表示装置に反射型液晶表示装置を用いるものが
多数存在している。反射型液晶表示装置は、太陽光や室
内光などの外光を反射させることにより画面の明るさを
得ている。しかし、外光の少ないところでは画面に十分
な明るさが得られない。そこで、外光の多いときには外
光による照明の障害とならず、外光の少ないときには反
射型液晶パネルを照明し、かつ観察者の障害とならない
照明装置付きの反射型液晶表示装置が要望されており、
照明装置として、導光体及び光源としての蛍光管を用い
たものが幾つか採用されている。2. Description of the Related Art In recent years, personal computers and portable information terminals have been reduced in size and portability, and reduction of power consumption of image display apparatuses has become an important issue. For this reason, there are many image display devices using a reflective liquid crystal display device. The reflection type liquid crystal display device obtains the brightness of the screen by reflecting external light such as sunlight and indoor light. However, sufficient brightness cannot be obtained on the screen in a place with little external light. Therefore, there is a demand for a reflective liquid crystal display device with an illuminating device that does not hinder the illumination due to external light when there is much external light and illuminates the reflective liquid crystal panel when there is little external light and does not hinder the observer. Yes,
Some lighting devices using a light guide and a fluorescent tube as a light source have been employed.
【０００３】ここで、蛍光管と導光体とで構成される従
来の照明装置を用いた反射型液晶表示装置について説明
する。従来の照明装置は、図４に示すように、蛍光管１
と、導光体２と、反射部材（以下、リフレクタと呼
ぶ。）３とで構成されており、反射型液晶表示装置４の
表示画面４ａの側に対向配置されている。Here, a description will be given of a reflection type liquid crystal display device using a conventional lighting device comprising a fluorescent tube and a light guide. As shown in FIG.
, A light guide 2, and a reflection member (hereinafter, referred to as a reflector) 3, and are arranged to face the display screen 4 a of the reflection type liquid crystal display device 4.
【０００４】蛍光管１は、例えば、熱陰極管や冷陰極管
などであり、図５に示すように、導光体２の側面２ｃに
平行に配置されている。導光体２は、図５に示すよう
に、反射面２ａと出射面２ｂとが対向形成された透明な
板状であって、反射面２ａと出射面２ｂとの間の側面２
ｃから内部に入射された入射光を反射面２ａで出射面２
ｂの方に反射させて出射面２ｂから出射するものであ
る。反射面２ａには、光が入射される側面２ｃから離れ
るに従って深くなる溝２ｄが複数形成されている。[0004] The fluorescent tube 1 is, for example, a hot cathode tube, a cold cathode tube, or the like, and is arranged in parallel with the side surface 2c of the light guide 2 as shown in FIG. As shown in FIG. 5, the light guide 2 is a transparent plate having a reflection surface 2a and an emission surface 2b formed opposite to each other, and a side surface 2 between the reflection surface 2a and the emission surface 2b.
c is incident on the reflection surface 2a.
The light is reflected toward b and exits from the exit surface 2b. On the reflection surface 2a, a plurality of grooves 2d are formed which become deeper as the distance from the side surface 2c on which light is incident.
【０００５】リフレクタ３は、蛍光管１から導光体２の
側面２ｃまでの導光経路の周囲を覆い蛍光管１からの出
射光を導光体２の側面２ｃに入射させるように構成され
ている。また、このリフレクタ３の内面３ａは、反射率
が高くなるように構成されている。このリフレクタ３
は、例えば、銀やアルミなどの反射率の高い材料を樹脂
のシートに蒸着し、このシートを薄い金属板あるいは樹
脂のシートに蒸着して構成されている。[0005] The reflector 3 is configured to cover the periphery of the light guide path from the fluorescent tube 1 to the side surface 2 c of the light guide 2, and to allow light emitted from the fluorescent tube 1 to enter the side surface 2 c of the light guide 2. I have. The inner surface 3a of the reflector 3 is configured to have a high reflectance. This reflector 3
Is formed by evaporating a material having a high reflectance such as silver or aluminum on a resin sheet, and evaporating this sheet on a thin metal plate or a resin sheet.
【０００６】以上のように構成された照明装置と反射型
液晶表示装置の光学的な動作について以下に説明する。
図４に示すように、蛍光管１から出射された光は導光体
２の側面２ｃに入射される。導光体２の側面２ｃから入
射された入射光は、この導光体２の内部を全反射しなが
ら伝播する。伝播光は、導光体２の反射面２ａに形成さ
れた溝２ｄによって反射し、全反射条件が崩れ導光体２
の出射面２ｂから出射する。導光体２の出射面２ｂから
出射された出射光は、反射型液晶表示装置４の表示画面
４ａに入射され、表示画面４ａの内部の液晶層を通過し
て反射板に至り、この反射板で照明装置の方に再反射さ
れる。このように反射型液晶表示装置４は、外部からの
入射光が少ないときに、照明装置からの光で画面の明る
さを得ている。[0006] The optical operation of the illumination device and the reflection type liquid crystal display device configured as described above will be described below.
As shown in FIG. 4, the light emitted from the fluorescent tube 1 is incident on the side surface 2c of the light guide 2. The light incident from the side surface 2 c of the light guide 2 propagates while totally reflecting inside the light guide 2. The propagating light is reflected by the groove 2d formed on the reflection surface 2a of the light guide 2, the total reflection condition is broken, and the light
From the emission surface 2b. The outgoing light emitted from the outgoing surface 2b of the light guide 2 is incident on the display screen 4a of the reflection type liquid crystal display device 4, passes through the liquid crystal layer inside the display screen 4a, reaches the reflector, and this reflector Is reflected back toward the lighting device. As described above, the reflection type liquid crystal display device 4 obtains the brightness of the screen with the light from the illumination device when the amount of incident light from outside is small.
【０００７】[0007]
【発明が解決しようとする課題】しかしながら従来の照
明装置の構成では、光源として蛍光管を用いるため、蛍
光管を点灯させるための回路が必要であり、小型化、ポ
ータブル化が困難であり、蛍光管は消費電力が大きいと
いう問題がある。また、液晶表示装置にはこの照明装置
を用いているので、液晶表示装置において前記と同様の
問題がある。However, in the structure of the conventional illuminating device, since a fluorescent tube is used as a light source, a circuit for lighting the fluorescent tube is required. Tubes have the problem of high power consumption. In addition, since this illumination device is used in a liquid crystal display device, the liquid crystal display device has the same problem as described above.
【０００８】本発明は、低消費電力及び小型化可能な照
明装置と液晶表示装置を提供することを目的とする。An object of the present invention is to provide a lighting device and a liquid crystal display device which can be reduced in power consumption and size.
【０００９】[0009]
【課題を解決するための手段】本発明の照明装置は、反
射面と出射面とが対向形成され、前記の反射面と出射面
との間の側面から内部に入射された入射光を前記反射面
で前記出射面の方に反射させて前記出射面から出射する
導光体と、導光体の前記側面に光を出射する点光源とを
設けたものである。According to the illuminating device of the present invention, a reflection surface and an emission surface are formed to face each other, and the incident light incident inside from the side surface between the reflection surface and the emission surface is reflected. A light guide that reflects the light toward the emission surface from the surface and emits the light from the emission surface; and a point light source that emits light to the side surface of the light guide.
【００１０】本発明によると、低消費電力及び小型化可
能な照明装置を得ることができる。According to the present invention, it is possible to obtain a lighting device that can be reduced in power consumption and reduced in size.
【００１１】[0011]
【発明の実施の形態】本発明の請求項１に記載の発明
は、反射面と出射面とが対向形成され、前記の反射面と
出射面との間の側面から内部に入射された入射光を前記
反射面で前記出射面の方に反射させて前記出射面から出
射する導光体と、導光体の前記側面に光を出射する点光
源とを設けた照明装置としたものであり、低消費電力で
小型化した照明装置を得ることができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a reflection surface and an emission surface are formed to be opposed to each other, and the incident light incident on the inside from the side surface between the reflection surface and the emission surface. And a light guide that reflects the light toward the light exit surface with the reflection surface and emits light from the light exit surface, and a point light source that emits light to the side surface of the light guide, the lighting device being provided. A compact lighting device with low power consumption can be obtained.
【００１２】本発明の請求項２に記載の発明は、点光源
を導光体の側面の長手方向に沿って複数設けた請求項１
記載の照明装置としたものであり、導光体の側面に入射
する際の光を均一にすることができ、導光体の出射面か
ら均一な面光源を得ることができる。本発明の請求項３
に記載の発明は、点光源から導光体の側面までの導光経
路の途中に、前記点光源からの光を透過し拡散させて前
記導光体の側面に出射する拡散部材を設けた請求項１記
載の照明装置としたものであり、点光源からの光を拡散
部材で透過し拡散して導光体の側面に出射することがで
き、点光源の指向性を弱めることができる。これにより
導光体の側面に入射する際の光を均一にすることがで
き、導光体の出射面から均一な面光源を得ることができ
る。According to a second aspect of the present invention, a plurality of point light sources are provided along the longitudinal direction of the side surface of the light guide.
According to the illumination device described above, it is possible to make the light incident on the side surface of the light guide uniform, and to obtain a uniform surface light source from the emission surface of the light guide. Claim 3 of the present invention
The invention according to claim 1, further comprising a diffusing member that transmits and diffuses the light from the point light source and emits the light to the side surface of the light guide, in a light guide path from the point light source to the side surface of the light guide. Item 9. The lighting device according to Item 1, wherein the light from the point light source can be transmitted through the diffusion member, diffused and emitted to the side surface of the light guide, and the directivity of the point light source can be reduced. This makes it possible to make the light incident on the side surface of the light guide uniform, and to obtain a uniform surface light source from the exit surface of the light guide.
【００１３】本発明の請求項４に記載の発明は、光を反
射する反射部材を、点光源から導光体の側面までの導光
経路の周囲に、前記点光源からの間接光を前記導光体の
側面に入射させるように設けた請求項１から請求項３の
いずれかに記載の照明装置としたものであり、点光源か
らの光を間接的に導光体の側面に入射させることがで
き、点光源から導光体の側面までの距離を長くすること
ができ、点光源の指向性を弱めることができる。これに
より導光体の側面に入射する際の光を均一にすることが
でき、導光体の出射面から均一な面光源を得ることがで
きる。According to a fourth aspect of the present invention, a reflecting member for reflecting light is provided around a light guide path from a point light source to a side surface of the light guide, and the indirect light from the point light source is guided to the light guide path. The lighting device according to any one of claims 1 to 3, wherein the lighting device is provided so as to be incident on a side surface of the light body, wherein light from a point light source is indirectly incident on the side surface of the light guide. The distance from the point light source to the side surface of the light guide can be increased, and the directivity of the point light source can be reduced. This makes it possible to make the light incident on the side surface of the light guide uniform, and to obtain a uniform surface light source from the exit surface of the light guide.
【００１４】本発明の請求項５に記載の発明は、反射部
材の一端を、導光体の反射面と出射面の点光源側に両面
粘着テープを介して固定した請求項４記載の照明装置と
したものであり、組み立て工程において容易に反射部材
を取り付けることができる。本発明の請求項６に記載の
発明は、反射部材の一端を導光体の点光源側の反射面と
出射面とに取り付け、前記反射部材の前記導光体の出射
面への取付幅を、前記反射部材の前記導光体の反射面へ
の取付幅に比べて長くした請求項４記載の照明装置とし
たものであり、導光体の出射面からの面状の光を均一に
することができる。According to a fifth aspect of the present invention, there is provided the lighting device according to the fourth aspect, wherein one end of the reflecting member is fixed to the point light source side of the reflecting surface and the emitting surface of the light guide via a double-sided adhesive tape. The reflecting member can be easily attached in the assembling process. In the invention according to claim 6 of the present invention, one end of the reflection member is attached to the reflection surface and the emission surface on the side of the point light source of the light guide, and the attachment width of the reflection member to the emission surface of the light guide is reduced. 5. The lighting device according to claim 4, wherein the width of the reflection member is greater than the width of the light guide attached to the reflection surface of the light guide, and the planar light from the emission surface of the light guide is made uniform. be able to.
【００１５】本発明の請求項７に記載の発明は、反射部
材の一端を導光体の点光源側の反射面と出射面とに取り
付け、前記反射部材の前記導光体の出射面への取付部分
に光を吸収する部材を設けた請求項４記載の照明装置と
したものであり、導光体の反射面の上方位置からこの導
光体を見ると反射部材での反射光が目立って光るような
ことを防止できる。According to a seventh aspect of the present invention, one end of the reflecting member is attached to the reflecting surface on the point light source side of the light guide and the emitting surface, and the reflecting member is connected to the emitting surface of the light guide. 5. The lighting device according to claim 4, wherein a light absorbing member is provided on the mounting portion, and when the light guide is viewed from a position above the reflection surface of the light guide, light reflected by the reflection member is conspicuous. Shining can be prevented.
【００１６】本発明の請求項８に記載の発明は、請求項
１から請求項７のいずれかに記載の照明装置を設けた液
晶表示装置としたものであり、低消費電力で小型化で
き、導光体の出射面からの均一な面状の照明光を享受で
きる液晶表示装置を得ることができる。以下、本発明の
照明装置と液晶表示装置を具体的な実施の形態に基づい
て説明する。According to an eighth aspect of the present invention, there is provided a liquid crystal display device provided with the illuminating device according to any one of the first to seventh aspects. A liquid crystal display device that can receive uniform planar illumination light from the light exit surface of the light guide can be obtained. Hereinafter, a lighting device and a liquid crystal display device of the present invention will be described based on specific embodiments.
【００１７】（実施の形態１）本発明の実施の形態１の
照明装置は、図１に示すように、反射面２ａと出射面２
ｂとが対向形成され、この反射面２ａと出射面２ｂとの
間の側面２ｃから内部に入射された入射光を反射面２ａ
で出射面２ｂの方に反射させて出射面２ｂから出射する
導光体２と、導光体２の側面２ｃに光を出射する点光源
としての発光ダイオード５とを設け、発光ダイオード５
から導光体２の側面２ｃまでの導光経路の途中に、発光
ダイオード５からの光を透過し拡散させて導光体２の側
面２ｃに出射する拡散部材６を設け、前記導光経路の周
囲に、発光ダイオード５からの間接光を導光体２の側面
２ｃに入射させるよう光を反射する反射部材としてのリ
フレクタ７ａ，７ｂを設けたものである。(Embodiment 1) As shown in FIG. 1, a lighting device according to Embodiment 1 of the present invention has a reflecting surface 2a and an emitting surface 2a.
b are formed to face each other, and the incident light incident inside from the side surface 2c between the reflection surface 2a and the emission surface 2b is reflected by the reflection surface 2a.
A light guide 2 that reflects toward the emission surface 2b and emits from the emission surface 2b, and a light emitting diode 5 as a point light source that emits light on the side surface 2c of the light guide 2 is provided.
In the middle of the light guide path from the light guide 2 to the side surface 2c of the light guide 2, a diffusion member 6 that transmits and diffuses the light from the light emitting diode 5 and emits the light to the side surface 2c of the light guide 2 is provided. Reflectors 7a and 7b are provided around the periphery as reflecting members for reflecting light so that indirect light from the light emitting diode 5 is incident on the side surface 2c of the light guide 2.
【００１８】発光ダイオード５は、図２に示すように、
導光体２の側面２ｃの長手方向に沿って基板８に複数設
けられている。ただし、この図２はリフレクタ７ａを省
略して図示したものである。基板８は、発光ダイオード
５が配設されるためのものであり、特に、光をこの基板
の上位方向に効果的に反射させるよう光学特性を持たせ
たものではない。The light emitting diode 5, as shown in FIG.
A plurality of light guides 2 are provided on the substrate 8 along the longitudinal direction of the side surface 2c. However, FIG. 2 does not show the reflector 7a. The substrate 8 is for disposing the light emitting diode 5, and is not particularly provided with an optical characteristic so as to effectively reflect light in the upper direction of the substrate.
【００１９】拡散部材６としては、例えば、光拡散フィ
ルム（（株）ツジデン製：型名Ｄ１２３）などを用いて
いる。反射部材は、図１に示すように、導光体２の反射
面２ａに固定するリフレクタ７ａと、導光体２の出射面
２ｂに固定するリフレクタ７ｂとを組み合わせて略Ｌ字
型に構成されている。導光体２の側面２ｃとリフレクタ
７ａ，７ｂと基板８とで覆われた空間は空洞である。As the diffusion member 6, for example, a light diffusion film (manufactured by Tsujiden Co., Ltd .: model name D123) is used. As shown in FIG. 1, the reflection member is formed in a substantially L-shape by combining a reflector 7 a fixed to the reflection surface 2 a of the light guide 2 and a reflector 7 b fixed to the emission surface 2 b of the light guide 2. ing. The space covered by the side surface 2c of the light guide 2, the reflectors 7a and 7b, and the substrate 8 is a cavity.
【００２０】なお、導光体２は、従来例と同様のもので
あり、反射面２ａには、光が入射される側面２ｃから離
れるに従って深くなる溝２ｄが複数形成されている。こ
こで、この照明装置の光学的な動作について以下に説明
する。図１に示すように、発光ダイオード５からの直接
光やリフレクタ７ａ，７ｂで反射された間接光は、導光
経路の途中の拡散部材６に入射される。拡散部材６は、
入射された光を拡散して導光体２の側面２ｃの方に出射
する。導光体２の側面２ｃに入射された入射光は、この
導光体２の内部を全反射しながら伝播する。伝播光は、
導光体２の反射面２ａに形成された溝２ｄによって反射
し、全反射条件が崩れ導光体２の出射面２ｂから出射す
る。The light guide 2 is the same as that of the conventional example, and a plurality of grooves 2d are formed on the reflection surface 2a so as to become deeper away from the side surface 2c where the light is incident. Here, an optical operation of the illumination device will be described below. As shown in FIG. 1, the direct light from the light emitting diode 5 and the indirect light reflected by the reflectors 7a and 7b are incident on the diffusion member 6 in the light guide path. The diffusion member 6
The incident light is diffused and emitted toward the side surface 2c of the light guide 2. The light incident on the side surface 2c of the light guide 2 propagates while totally reflecting inside the light guide 2. The propagating light is
The light is reflected by the groove 2 d formed on the reflection surface 2 a of the light guide 2, and the light is emitted from the emission surface 2 b of the light guide 2 when the total reflection condition is broken.
【００２１】ここで例えば、図４に示した反射型液晶表
示装置４の表示画面４ａを導光体２の出射面２ｂに対向
配置しているとすると、導光体２の出射面２ｂから出射
された出射光は、反射型液晶表示装置４の表示画面４ａ
に入射され、表示画面４ａの内部の液晶層を通過して反
射板に至り、この反射板で照明装置の方に再反射され
る。このように反射型液晶表示装置４は、外部からの入
射光が少ないときに、照明装置からの光で画面の明るさ
を得ている。For example, if the display screen 4a of the reflection type liquid crystal display device 4 shown in FIG. 4 is arranged to face the light exit surface 2b of the light guide 2, the light exits from the light exit surface 2b of the light guide 2. The emitted light is applied to the display screen 4a of the reflective liquid crystal display device 4.
And passes through the liquid crystal layer inside the display screen 4a to reach the reflector, where the light is reflected again toward the lighting device. As described above, the reflection type liquid crystal display device 4 obtains the brightness of the screen with the light from the illumination device when the amount of incident light from outside is small.
【００２２】このように構成したため、点光源として発
光ダイオード５を用いるので、従来例の蛍光管１と比較
して低消費電力とすることができる。また、従来例の蛍
光管１では発光するのにインバータ回路が必要である
が、発光ダイオード５では前記のインバータ回路を不必
要とすることができるので、小型化、ポータブル化する
ことができる。With this configuration, the light emitting diode 5 is used as a point light source, so that power consumption can be reduced compared to the conventional fluorescent tube 1. In addition, the fluorescent tube 1 of the conventional example requires an inverter circuit to emit light, but the light emitting diode 5 does not require the inverter circuit, so that the size and the portability can be reduced.
【００２３】また、拡散部材６を発光ダイオード５から
導光体２の側面２ｃまでの導光経路の途中に配置してい
るので、発光ダイオード５からの光を拡散部材６で透過
し拡散して導光体２の側面２ｃに出射することができ、
発光ダイオード５の指向性を弱めることができる。これ
により導光体２の側面２ｃに入射する際の光を均一にす
ることができ、導光体２の出射面２ｂから均一な面光源
を得ることができる。Further, since the diffusion member 6 is disposed in the light guide path from the light emitting diode 5 to the side surface 2c of the light guide 2, light from the light emitting diode 5 is transmitted and diffused by the diffusion member 6. Light can be emitted to the side surface 2c of the light guide 2,
The directivity of the light emitting diode 5 can be reduced. Thereby, the light when entering the side surface 2c of the light guide 2 can be made uniform, and a uniform surface light source can be obtained from the emission surface 2b of the light guide 2.
【００２４】また、図１に示すように、リフレクタ７
ａ，７ｂを略Ｌ字型に形成しているので、点光源として
の発光ダイオード５からの光が導光体２の側面２ｃへ入
射するまでに、リフレクタ７ａ，７ｂで反射させること
で導光経路を長くとることができ、点光源の指向性を弱
めることができ、導光体２の側面２ｃに対して垂直な方
向ａを長くすることなく導光経路を長くとることがで
き、照明装置が額縁方向に大きくなることを防止でき、
照明装置自体の小型化ができる。Also, as shown in FIG.
Since a and 7b are formed in a substantially L-shape, the light from the light emitting diode 5 as a point light source is reflected by the reflectors 7a and 7b until the light enters the side surface 2c of the light guide 2. The path can be lengthened, the directivity of the point light source can be weakened, and the light guide path can be lengthened without increasing the direction a perpendicular to the side surface 2c of the light guide 2, and the lighting device Can be prevented from increasing in the frame direction,
The size of the lighting device itself can be reduced.
【００２５】また、この照明装置を液晶表示装置に用い
ると、前述のように照明装置を低消費電力で小型化する
ことができるので、液晶表示装置も低消費電力で小型化
することができる。なお、基板８は効果的に光を反射さ
せるためのものではないが、必要であれば、この基板８
の発光ダイオード５の配設面側に光を反射させる光反射
層を形成しても良い。When this lighting device is used for a liquid crystal display device, the lighting device can be reduced in size with low power consumption as described above, so that the liquid crystal display device can also be reduced in size with low power consumption. The substrate 8 is not for reflecting light effectively, but if necessary, the substrate 8
A light reflecting layer for reflecting light may be formed on the surface on which the light emitting diodes 5 are provided.
【００２６】この実施の形態１では、発光ダイオード５
を導光体２の側面２ｃの長手方向に沿って複数設けてい
るが、導光体２に入射される入射光の光量が十分であれ
ば発光ダイオード５を単数とした場合であっても、同様
の効果を有する。この実施の形態１では、発光ダイオー
ド５から導光体２の側面２ｃまでの導光経路の途中に光
を透過し拡散させて出射する拡散部材６を設けている
が、発光ダイオード５の指向性が問題にならない場合に
は特に設けなくても良い。In the first embodiment, the light emitting diode 5
Are provided along the longitudinal direction of the side surface 2c of the light guide 2, but if the amount of incident light incident on the light guide 2 is sufficient, even if the light emitting diode 5 is singular, It has a similar effect. In the first embodiment, the diffusion member 6 that transmits, diffuses, and emits light is provided in the middle of the light guide path from the light emitting diode 5 to the side surface 2c of the light guide 2. If is not a problem, it may not be provided.
【００２７】この実施の形態１では、発光ダイオード５
から導光体２の側面２ｃまでの導光経路の周囲に略Ｌ字
型のリフレクタ７ａ，７ｂを設けているが、このリフレ
クタ７ａ，７ｂをさらに曲げて略Ｕ字型などの形状とし
た場合であっても、額縁方向に大きくなることを防止で
きる。 （実施の形態２）本発明の実施の形態２の照明装置は、
図３に示すように、前述の実施の形態１のリフレクタ７
ａ，７ｂの一端７ｃ，７ｄを、両面粘着テープ９を介し
て導光体２の反射面２ａと出射面２ｂの発光ダイオード
５の側に固定するとともに、このリフレクタ７ｂの導光
体２の出射面２ｂへの取付幅ｂを、リフレクタ７ａの導
光体２の反射面２ａへの取付幅ｃに比べて長くし、リフ
レクタ７ｂの導光体２の出射面２ｂへの取付部分に光を
吸収する部材を設けたものである。In the first embodiment, the light emitting diode 5
A substantially L-shaped reflector 7a, 7b is provided around the light guide path from the light guide 2 to the side surface 2c of the light guide 2, but when the reflectors 7a, 7b are further bent into a substantially U-shaped or the like. However, it can be prevented from increasing in the frame direction. (Embodiment 2) A lighting device according to Embodiment 2 of the present invention
As shown in FIG. 3, the reflector 7 according to the first embodiment described above is used.
The ends 7c and 7d of the light guides 2a and 2b are fixed to the reflection surface 2a and the light emission surface 2b of the light guide 2 on the side of the light emitting diode 5 via a double-sided adhesive tape 9, and the light guide 2 emits light from the reflector 7b. The mounting width b of the reflector 7a on the surface 2b is longer than the mounting width c of the light guide 2 on the reflection surface 2a of the reflector 7a, so that the light is absorbed by the mounting portion of the reflector 7b on the emission surface 2b of the light guide 2. That is, a member is provided.
【００２８】光を吸収する部材は、例えば、黒色など光
を吸収する色を有するものであれば良く、ここではリフ
レクタ７ｂと導光体２の出射面２ｂとの間に介装される
両面粘着テープ９に黒色の両面粘着テープを用いてい
る。このように構成したため、仮に、リフレクタ７ａ，
７ｂの導光体２への取付幅ｂ，ｃを等しくした場合に
は、リフレクタ７ａでの反射光は経路１０ａの後に経路
１０ｃを通るので、導光体２の出射面２ｂからの面状の
光は均一ではなくリフレクタ７ｂの付近が明るくなって
しまうが、本実施の形態２では、リフレクタ７ｂの導光
体２の出射面２ｂへの取付幅ｂを、リフレクタ７ａの導
光体２の反射面２ａへの取付幅ｃに比べて長くしている
ので、リフレクタ７ａでの反射光は経路１０ａの後にリ
フレクタ７ｂで反射して経路１０ｂを通るので、導光体
２の出射面２ｂからの面状の光を均一にすることができ
る。The light-absorbing member may be any member having a color that absorbs light, such as black. For example, a double-sided adhesive interposed between the reflector 7b and the exit surface 2b of the light guide 2 is used. A black double-sided adhesive tape is used for the tape 9. With such a configuration, if the reflectors 7a,
When the mounting widths b and c of the light guide 7b to the light guide 2 are made equal, the reflected light from the reflector 7a passes through the path 10c after the path 10a, so that the light reflected from the exit surface 2b of the light guide 2 has a planar shape. Although the light is not uniform and becomes bright near the reflector 7b, in the second embodiment, the mounting width b of the reflector 7b on the light exit surface 2b of the light guide 2 is determined by the reflection of the light guide 2 of the reflector 7a. The light reflected by the reflector 7a is reflected by the reflector 7b after the path 10a and passes through the path 10b because it is longer than the mounting width c to the surface 2a. Light can be made uniform.
【００２９】また、リフレクタ７ｂの導光体２の出射面
２ｂへの取り付け部分に黒色の両面粘着テープを用いて
いるため、この照明装置を反射型液晶表示装置などと組
み合わせて使用する場合に、導光体２の反射面２ａの上
方位置からこの導光体２を見るとリフレクタ７ｂでの反
射光が目立って光るようなことを防止できる。また、図
３に示すように、拡散部材６をリフレクタ７ｂの部分７
ｅに押しつけた状態で、リフレクタ７ａに固定すること
により、製造工程において照明装置を組み立て易くでき
る。Further, since a black double-sided adhesive tape is used for a portion where the reflector 7b is attached to the light emitting surface 2b of the light guide 2, when this illumination device is used in combination with a reflection type liquid crystal display device or the like, When the light guide 2 is viewed from a position above the reflection surface 2a of the light guide 2, it is possible to prevent the reflected light from the reflector 7b from shining noticeably. Further, as shown in FIG. 3, the diffusion member 6 is connected to a portion 7 of the reflector 7b.
By fixing to the reflector 7a in a state where it is pressed against e, the lighting device can be easily assembled in the manufacturing process.
【００３０】この実施の形態２では、リフレクタ７ｂと
導光体２の出射面２ｂとの間に介装した両面粘着テープ
９に黒色の両面粘着テープを用いているが、黒色以外で
光を吸収する色としても良いし、色付きの両面粘着テー
プ９を用いず導光体２またはリフレクタ７ｂに直接に光
を吸収する部材を設けても良い。In the second embodiment, a black double-sided adhesive tape is used for the double-sided adhesive tape 9 interposed between the reflector 7b and the light exit surface 2b of the light guide 2, but light other than black is absorbed. Alternatively, a member that directly absorbs light may be provided on the light guide 2 or the reflector 7b without using the colored double-sided adhesive tape 9.
【００３１】[0031]
【発明の効果】以上のように本発明の照明装置によれ
ば、反射面と出射面とが対向形成され、前記の反射面と
出射面との間の側面から内部に入射された入射光を前記
反射面で前記出射面の方に反射させて前記出射面から出
射する導光体と、導光体の前記側面に光を出射する点光
源とを設けたことにより、従来の光源としての蛍光管に
比べて低消費電力とすることができ、従来のような蛍光
管を点灯させる回路を不必要とすることができるので小
型化でき、低消費電力で小型化した照明装置を得ること
ができる。As described above, according to the illuminating device of the present invention, the reflection surface and the emission surface are formed to face each other, and the incident light that has entered inside from the side surface between the reflection surface and the emission surface is controlled. By providing a light guide that reflects the light toward the emission surface from the reflection surface and emits the light from the emission surface, and a point light source that emits light to the side surface of the light guide, a fluorescent light as a conventional light source is provided. Power consumption can be reduced compared to a tube, and a circuit for illuminating a fluorescent tube as in the related art can be dispensed with, so that a downsized lighting device can be obtained with low power consumption. .
【００３２】また、前記の点光源を導光体の側面の長手
方向に沿って複数設けた場合では、導光体の側面に入射
する際の光を均一にすることができ、導光体の出射面か
ら均一な面光源を得ることができる。また、点光源から
導光体の側面までの導光経路の途中に、前記点光源から
の光を透過し拡散させて前記導光体の側面に出射する拡
散部材を設けた場合では、点光源からの光を拡散部材で
透過し拡散して導光体の側面に出射することができ、点
光源の指向性を弱めることができる。これにより導光体
の側面に入射する際の光を均一にすることができ、導光
体の出射面から均一な面光源を得ることができる。In the case where a plurality of the point light sources are provided along the longitudinal direction of the side surface of the light guide, light incident on the side surface of the light guide can be made uniform, and A uniform surface light source can be obtained from the exit surface. In the case where a diffusing member that transmits and diffuses light from the point light source and emits the light to the side surface of the light guide is provided in the middle of the light guide path from the point light source to the side surface of the light guide, the point light source Can be transmitted and diffused by the diffusion member and emitted to the side surface of the light guide, and the directivity of the point light source can be weakened. This makes it possible to make the light incident on the side surface of the light guide uniform, and to obtain a uniform surface light source from the exit surface of the light guide.
【００３３】また、光を反射する反射部材を、点光源か
ら導光体の側面までの導光経路の周囲に、前記点光源か
らの間接光を前記導光体の側面に入射させるように設け
た場合では、点光源からの光を間接的に導光体の側面に
入射させることができ、点光源から導光体の側面までの
距離を長くすることができ、点光源の指向性を弱めるこ
とができる。これにより導光体の側面に入射する際の光
を均一にすることができ、導光体の出射面から均一な面
光源を得ることができる。Further, a reflecting member for reflecting light is provided around a light guide path from the point light source to the side surface of the light guide so that indirect light from the point light source is incident on the side surface of the light guide. In this case, the light from the point light source can be indirectly incident on the side surface of the light guide, the distance from the point light source to the side surface of the light guide can be increased, and the directivity of the point light source is weakened. be able to. This makes it possible to make the light incident on the side surface of the light guide uniform, and to obtain a uniform surface light source from the exit surface of the light guide.
【００３４】また、反射部材の一端を、導光体の反射面
と出射面の点光源側に両面粘着テープを介して固定した
場合では、組み立て工程において容易に反射部材を取り
付けることができる。また、反射部材の一端を導光体の
点光源側の反射面と出射面とに取り付け、前記反射部材
の前記導光体の出射面への取付幅を、前記反射部材の前
記導光体の反射面への取付幅に比べて長くした場合で
は、導光体の出射面からの面状の光を均一にすることが
できる。In the case where one end of the reflecting member is fixed to the reflecting surface and the emitting surface of the light guide on the side of the point light source via a double-sided adhesive tape, the reflecting member can be easily attached in the assembling process. Further, one end of the reflection member is attached to the reflection surface and the emission surface on the side of the point light source of the light guide, and the mounting width of the reflection member to the emission surface of the light guide is set to the width of the light guide of the reflection member. In the case where the width is longer than the width of attachment to the reflection surface, planar light from the emission surface of the light guide can be made uniform.
【００３５】また、反射部材の一端を導光体の点光源側
の反射面と出射面とに取り付け、前記反射部材の前記導
光体の出射面への取付部分に光を吸収する部材を設けた
場合では、導光体の反射面の上方位置からこの導光体を
見ると反射部材での反射光が目立って光るようなことを
防止できる。また、前記の照明装置を設けた液晶表示装
置の場合では、低消費電力で小型化でき、導光体の出射
面からの均一な面状の照明光を享受できる液晶表示装置
を得ることができる。Further, one end of the reflection member is attached to the reflection surface on the point light source side of the light guide and the emission surface, and a member for absorbing light is provided at a portion where the reflection member is attached to the emission surface of the light guide. In this case, when the light guide is viewed from a position above the reflection surface of the light guide, it is possible to prevent the reflected light from the reflection member from shining noticeably. In addition, in the case of a liquid crystal display device provided with the above-described lighting device, a liquid crystal display device which can be reduced in size with low power consumption and can enjoy uniform planar illumination light from the emission surface of the light guide can be obtained. .
【図１】本発明の実施の形態１の照明装置の構成を示す
断面図FIG. 1 is a cross-sectional view illustrating a configuration of a lighting device according to a first embodiment of the present invention.
【図２】同実施の形態１の照明装置の点光源付近の構成
を示す詳細斜視図FIG. 2 is a detailed perspective view showing a configuration in the vicinity of a point light source of the illumination device according to the first embodiment.
【図３】本発明の実施の形態２のリフレクタと導光体と
の接続部分を示す拡大断面図FIG. 3 is an enlarged sectional view showing a connection portion between a reflector and a light guide according to a second embodiment of the present invention.
【図４】従来の照明装置と反射型液晶表示装置の構成を
示す断面図FIG. 4 is a cross-sectional view illustrating a configuration of a conventional illumination device and a reflective liquid crystal display device.
【図５】従来の照明装置の構成を示す斜視図FIG. 5 is a perspective view showing a configuration of a conventional lighting device.
２ 導光体 ５ 発光ダイオード ６ 拡散部材 ７ａ リフレクタ ７ｂ リフレクタ ８ 基板 ９ 両面粘着テープ Reference Signs List 2 light guide 5 light emitting diode 6 diffusion member 7a reflector 7b reflector 8 substrate 9 double-sided adhesive tape
───────────────────────────────────────────────────── フロントページの続き (72)発明者 中林 耕基 大阪府門真市大字門真1006番地 松下電器 産業株式会社内 Ｆターム(参考） 2H038 AA55 BA06 2H091 FA14Z FA23Z FA32Z FA34Z FA45Z FB02 FB08 LA11 LA18 LA30 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koki Nakabayashi 1006 Kazuma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd.
Claims (8)
反射面と出射面との間の側面から内部に入射された入射
光を前記反射面で前記出射面の方に反射させて前記出射
面から出射する導光体と、 導光体の前記側面に光を出射する点光源とを設けた照明
装置。1. A reflecting surface and an emitting surface are formed opposite to each other, and incident light incident inside from a side surface between the reflecting surface and the emitting surface is reflected by the reflecting surface toward the emitting surface. A lighting device, comprising: a light guide that emits light from the emission surface; and a point light source that emits light on the side surface of the light guide.
複数設けた請求項１記載の照明装置。2. The lighting device according to claim 1, wherein a plurality of point light sources are provided along a longitudinal direction of a side surface of the light guide.
途中に、前記点光源からの光を透過し拡散させて前記導
光体の側面に出射する拡散部材を設けた請求項１記載の
照明装置。3. A diffusing member for transmitting and diffusing light from the point light source and radiating the light from the side surface of the light guide is provided in the light guide path from the point light source to the side surface of the light guide. The lighting device according to claim 1.
体の側面までの導光経路の周囲に、前記点光源からの間
接光を前記導光体の側面に入射させるように設けた請求
項１から請求項３のいずれかに記載の照明装置。4. A reflection member for reflecting light is provided around a light guide path from a point light source to a side surface of the light guide so that indirect light from the point light source is incident on the side surface of the light guide. The lighting device according to claim 1.
面の点光源側に両面粘着テープを介して固定した請求項
４記載の照明装置。5. The lighting device according to claim 4, wherein one end of the reflecting member is fixed to the reflecting surface and the emitting surface of the light guide on the point light source side via a double-sided adhesive tape.
面と出射面とに取り付け、前記反射部材の前記導光体の
出射面への取付幅を、前記反射部材の前記導光体の反射
面への取付幅に比べて長くした請求項４記載の照明装
置。6. An end of the reflecting member is attached to the reflecting surface on the side of the point light source of the light guide and the exit surface, and the width of attachment of the reflecting member to the exit surface of the light guide is adjusted by the guide width of the reflecting member. The lighting device according to claim 4, wherein the lighting device is longer than a mounting width of the light body to the reflecting surface.
面と出射面とに取り付け、前記反射部材の前記導光体の
出射面への取付部分に光を吸収する部材を設けた請求項
４記載の照明装置。7. One end of a reflection member is attached to a reflection surface and a light emission surface of a light guide on a point light source side, and a light absorbing member is provided at a portion where the reflection member is attached to the light emission surface of the light guide. The lighting device according to claim 4.
照明装置を設けた液晶表示装置。8. A liquid crystal display device provided with the lighting device according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11140873A JP2000331522A (en) | 1999-05-21 | 1999-05-21 | Lighting system and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11140873A JP2000331522A (en) | 1999-05-21 | 1999-05-21 | Lighting system and liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000331522A true JP2000331522A (en) | 2000-11-30 |
Family
ID=15278755
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11140873A Withdrawn JP2000331522A (en) | 1999-05-21 | 1999-05-21 | Lighting system and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000331522A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20040050342A (en) * | 2002-12-10 | 2004-06-16 | 이상길 | Back light unit with enhanced light source position |
| US6890089B2 (en) * | 2001-05-12 | 2005-05-10 | Daimlerchrysler Ag | Light-guiding system for the passenger compartment of a motor vehicle |
| JP2007207751A (en) * | 2006-01-04 | 2007-08-16 | Nec Lcd Technologies Ltd | Light source device, and liquid crystal display device using same |
| JP2007234342A (en) * | 2006-02-28 | 2007-09-13 | Ccs Inc | Light irradiation apparatus |
| KR100912695B1 (en) * | 2002-12-26 | 2009-08-19 | 엘지디스플레이 주식회사 | Backlight unit of liquid crystal display device |
| GB2460139A (en) * | 2008-05-23 | 2009-11-25 | Honda Access Kk | In-vehicle illuminating light guide |
| KR20120042174A (en) * | 2010-10-22 | 2012-05-03 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN104613417A (en) * | 2015-02-05 | 2015-05-13 | 成都市宏山科技有限公司 | Light transferring pole with low light transmission loss |
| CN105987356A (en) * | 2015-01-28 | 2016-10-05 | 扬升照明股份有限公司 | Light source module and L-shaped light guide plate |
| WO2017020584A1 (en) * | 2015-08-05 | 2017-02-09 | 深圳市银盾科技开发有限公司 | Environmentally friendly automotive illuminating lamp |
| KR101841901B1 (en) * | 2010-08-25 | 2018-03-26 | 삼성전자주식회사 | Liquid crystal display device |
-
1999
- 1999-05-21 JP JP11140873A patent/JP2000331522A/en not_active Withdrawn
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6890089B2 (en) * | 2001-05-12 | 2005-05-10 | Daimlerchrysler Ag | Light-guiding system for the passenger compartment of a motor vehicle |
| KR20040050342A (en) * | 2002-12-10 | 2004-06-16 | 이상길 | Back light unit with enhanced light source position |
| KR100912695B1 (en) * | 2002-12-26 | 2009-08-19 | 엘지디스플레이 주식회사 | Backlight unit of liquid crystal display device |
| JP2007207751A (en) * | 2006-01-04 | 2007-08-16 | Nec Lcd Technologies Ltd | Light source device, and liquid crystal display device using same |
| JP4579171B2 (en) * | 2006-02-28 | 2010-11-10 | シーシーエス株式会社 | Light irradiation device |
| JP2007234342A (en) * | 2006-02-28 | 2007-09-13 | Ccs Inc | Light irradiation apparatus |
| JP4593649B2 (en) * | 2008-05-23 | 2010-12-08 | 株式会社ホンダアクセス | Vehicle lighting device |
| JP2009280150A (en) * | 2008-05-23 | 2009-12-03 | Honda Access Corp | In-vehicle lighting system |
| GB2460139A (en) * | 2008-05-23 | 2009-11-25 | Honda Access Kk | In-vehicle illuminating light guide |
| US7980739B2 (en) | 2008-05-23 | 2011-07-19 | Honda Access Corporation | In-vehicle illuminating device |
| GB2460139B (en) * | 2008-05-23 | 2013-01-30 | Honda Access Kk | In-vehicle illuminating device |
| KR101841901B1 (en) * | 2010-08-25 | 2018-03-26 | 삼성전자주식회사 | Liquid crystal display device |
| KR20120042174A (en) * | 2010-10-22 | 2012-05-03 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| KR102139469B1 (en) * | 2010-10-22 | 2020-07-31 | 엘지디스플레이 주식회사 | Liquid crystal display device |
| CN105987356A (en) * | 2015-01-28 | 2016-10-05 | 扬升照明股份有限公司 | Light source module and L-shaped light guide plate |
| CN105987356B (en) * | 2015-01-28 | 2019-04-23 | 中强光电股份有限公司 | Light source module and L shape light guide plate |
| CN104613417A (en) * | 2015-02-05 | 2015-05-13 | 成都市宏山科技有限公司 | Light transferring pole with low light transmission loss |
| WO2017020584A1 (en) * | 2015-08-05 | 2017-02-09 | 深圳市银盾科技开发有限公司 | Environmentally friendly automotive illuminating lamp |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4146349B2 (en) | Illumination unit and liquid crystal display device using the same | |
| JP3331326B2 (en) | Surface light source device and flat display device using the same | |
| KR20020081097A (en) | Liquid crystal display device | |
| JP2006310221A (en) | Edge input type backlight and liquid crystal display device | |
| JP4610312B2 (en) | Light source device and display device having the same | |
| JP2004273185A (en) | Planar lighting device and liquid crystal display device having the same | |
| JP2000331522A (en) | Lighting system and liquid crystal display device | |
| JP2004220889A (en) | Surface light source device | |
| JP2000011724A (en) | Back light, liquid crystal display and lighting system using this | |
| JP2007041476A (en) | Backlight | |
| JP2001101916A (en) | Surface light source device | |
| JP2003031016A (en) | Planar lighting device and image display device | |
| JP2001216827A (en) | Lighting unit and its manufacturing method, and liquid crystal display using lighting unit | |
| JP2001222907A (en) | Flat lighting source | |
| JP2004253187A (en) | Lighting unit and liquid crystal display using the same | |
| JP2007080520A (en) | Backlight device | |
| JP3472510B2 (en) | Surface emitting device | |
| JP2006302762A (en) | Edge input type backlight and liquid crystal display device | |
| US20050122444A1 (en) | Reflector of backlight assembly for liquid crystal display device | |
| JP2000056304A (en) | Backlight structure of liquid crystal display device | |
| JP2005347272A (en) | Manufacturing method of back-face light source and manufacturing method of display device using it | |
| JP2005293925A (en) | Luminaire and liquid crystal display | |
| JP2007041471A (en) | Backlight | |
| JP2005108675A (en) | Led backlight device | |
| JP4429870B2 (en) | Liquid crystal display |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20051107 |
|
| A711 | Notification of change in applicant |
Free format text: JAPANESE INTERMEDIATE CODE: A711 Effective date: 20061109 |
|
| A761 | Written withdrawal of application |
Free format text: JAPANESE INTERMEDIATE CODE: A761 Effective date: 20070326 |