JP2009099446A - Hollow type surface lighting device - Google Patents

Hollow type surface lighting device Download PDF

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JP2009099446A
JP2009099446A JP2007271246A JP2007271246A JP2009099446A JP 2009099446 A JP2009099446 A JP 2009099446A JP 2007271246 A JP2007271246 A JP 2007271246A JP 2007271246 A JP2007271246 A JP 2007271246A JP 2009099446 A JP2009099446 A JP 2009099446A
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light
led
leds
hollow
light source
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Yoji Kawasaki
要二 川崎
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Toshiba Lighting and Technology Corp
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Harison Toshiba Lighting Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hollow type surface lighting device which can respond to thinness and small frame and has no deterioration of illuminance at the surrounding of light-emitting surface, that is, near the frame, and in which white light of uniform illuminance can be obtained in the whole light-emitting surface. <P>SOLUTION: The hollow type surface lighting device 30 has a light reflecting surface member 2 arranged on the bottom side and a light-emitting surface member 3 arranged on the surface side of a unit case 1, makes the space interposed between these light reflecting surface member and the light-emitting surface member a hollow light guiding region 10, has an LED light source unit 5 to mount a large number of LEDs 7 on a wiring circuit board 6 arranged adjoining the hollow light guide region, and a narrow and long converging member 9 arranged at the front part of the LED light source unit. The LED light source unit 5 has a large number of LEDs 7 of single color emission, of red LED, green LED, and blue LED arranged in a prescribed row arrangement, and at the both end positions of this arrangement, multi-chip LEDs 7E1, 7E2 are arranged in which LEDs having two or all three emission colors different from the emission colors of the LEDs adjoining directly these are integrally packaged. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、例えば液晶表示装置のバックライトユニットのように発光面から均一な輝度分布の照明光を出射する中空式面照明装置に関する。   The present invention relates to a hollow surface illumination device that emits illumination light having a uniform luminance distribution from a light emitting surface, such as a backlight unit of a liquid crystal display device.

近年、液晶表示装置用バックライトユニットの光源として、冷陰極放電灯からＬＥＤに代替される動きが進んでいる。これは、ＬＥＤには有害物質である水銀が含まれず、環境調和型の光源として適していること、また最近の大幅な発光効率の向上により消費電力が大幅に低減できることによるところが大きい。ＬＥＤを光源として備えるバックライトユニットは、これまで携帯電話機やモバイル端末のように概ね小型機器に対する用途が中心であったが、最近では２０インチ型以上の液晶モニタや液晶テレビ等、大型の液晶表示装置にも採用の動きが進んでいる。   In recent years, as a light source of a backlight unit for a liquid crystal display device, there has been a movement to replace a cold cathode discharge lamp with an LED. This is because the LED does not contain mercury, which is a harmful substance, and is suitable as an environmentally conscious light source, and the power consumption can be greatly reduced by recent significant improvement in luminous efficiency. The backlight unit having an LED as a light source has been mainly used for small devices such as mobile phones and mobile terminals so far, but recently, a large-sized liquid crystal display such as a 20-inch-type liquid crystal monitor or a liquid crystal television is used. The movement of adopting the equipment is also progressing.

大型液晶表示装置の場合、そのバックライトユニットには高輝度であることが求められる。そのため、大型液晶表示装置用のバックライトユニットとしては、特開２００５−３１６３３７号公報（特許文献１）に記載されているように、面発光部の直下にＬＥＤ光源を配置した直下型のバックライトユニットが一般的になっている。ところが、直下型のＬＥＤバックライトユニットでは、光源がＬＥＤであるため、配列した多数のＬＥＤと面発光部との距離が近接しすぎると輝度むら、色むらとして認識され、それが照らす液晶の表示品質を悪化させてしまう。この現象は、高輝度を実現するために、１個当りの電力が１Ｗクラス以上の高出力ＬＥＤを光源とした場合にいっそう顕著に現われる。反面、輝度むら、色むらを低減させるためにＬＥＤと面発光部（拡散板）との距離を遠ざけることは、装置全体の厚みを増加させることにつながる。液晶パネル上の色再現性を向上させるために、光源を青色、赤色、緑色それぞれの単色発光ＬＥＤで例えばＮＴＳＣ規格比１００％以上を実現しようとすれば、混色性を確保する必要があって、いっそう厚みを増加させる必要があるが、近年の液晶表示装置の薄型化の傾向に反して好ましくない。   In the case of a large liquid crystal display device, the backlight unit is required to have high luminance. Therefore, as a backlight unit for a large-sized liquid crystal display device, as described in Japanese Patent Application Laid-Open No. 2005-316337 (Patent Document 1), a direct-type backlight in which an LED light source is disposed directly under a surface light emitting unit. Unit has become commonplace. However, in the direct type LED backlight unit, since the light source is an LED, if the distance between a large number of arranged LEDs and the surface light emitting part is too close, it is recognized as luminance unevenness and color unevenness, and the liquid crystal display illuminated by it Deteriorating quality. This phenomenon appears more prominently when a high-power LED having a power of 1 W class or more is used as a light source in order to realize high luminance. On the other hand, increasing the distance between the LED and the surface light emitting portion (diffusion plate) in order to reduce luminance unevenness and color unevenness leads to an increase in the thickness of the entire apparatus. In order to improve the color reproducibility on the liquid crystal panel, if it is intended to achieve, for example, 100% or more of the NTSC standard ratio with the blue, red, and green single-color light emitting LEDs, it is necessary to ensure color mixing. Although it is necessary to further increase the thickness, it is not preferable against the recent trend of thinning of liquid crystal display devices.

また直下型バックライトユニットとして、その光源に白色発光ＬＥＤを用いたものも開発され、商品化されている。ところが、一般的な白色発光ＬＥＤは、ＬＥＤが放射する青色光でチップ近傍に設けた黄色発光する蛍光体を励起して擬似的に白色発光させているため赤色の発光成分が少なく、そのため液晶パネルを透過させた際に赤色の色再現性が低下するので、高い色再現性を必要とする医療用、コンピュータグラフィックス用の液晶モニタのバックライトユニットとして採用するには課題が多い。   A direct-type backlight unit using a white light emitting LED as a light source has been developed and commercialized. However, a general white light emitting LED emits a pseudo white light by exciting a yellow light emitting phosphor provided in the vicinity of the chip with blue light emitted from the LED, so that there is little red light emitting component. Since the red color reproducibility is lowered when the light is transmitted, there are many problems in adopting it as a backlight unit for liquid crystal monitors for medical use and computer graphics that require high color reproducibility.

この直下型バックライトユニットの問題点を解決するものとして、装置内の端部に配列させたＬＥＤ光源の放射光を中空導光領域で反射させて面発光部から均一に出射させてその前方の液晶パネルに照射させる中空式バックライトユニットが特開２００６−１０６２１２号公報（特許文献２）にて知られている。この従来の中空式バックライトユニットでは、単色ＬＥＤを分散配列させて混色して発光色を得るようにしている。ところが、液晶モニタの薄型化と共に狭額縁化の要求が強い今日、バックライトユニットに対しても、両端のＬＥＤ位置と額縁の内周縁とが重なるか額縁の方が端部のＬＥＤよりもわずかに外側に位置するか程度しか寸法的な余裕がない。そのような条件のもとでは、単色ＬＥＤを列設した場合、列端部位置のＬＥＤからの光は単独では照度が低くなり、結果的にＬＥＤの光軸に沿った額縁の内周縁近くの照度が部分的に暗くなる問題点があった。また、同特許文献２には、各色ＬＥＤを厚み方向に分散配列し、かつ長手方向にも分散配列させることで混色し白色光を得る技術が記載されている。しかしながら、この場合にも、各列の両端位置のＬＥＤについては同様のことが起こり、結果的にＬＥＤの光軸に沿った額縁の内周縁近くの照度が部分的に暗くなる問題点があった。なお、従来、特開平８-１７１８０６号公報（特許文献３）によって片側に長尺光源を配置した中空式面照明装置が知られているが、この従来例の場合、光源に冷陰極放電ランプを採用しており、多数のＬＥＤを列設したＬＥＤ光源ユニットを採用してはいない。
特開２００５−３１６３３７号公報 特開２００６−１０６２１２号公報 特開平８-１７１８０６号公報 In order to solve the problems of this direct type backlight unit, the emitted light of the LED light source arranged at the end in the device is reflected by the hollow light guide region and emitted uniformly from the surface light emitting unit, and the front of the light source A hollow backlight unit for irradiating a liquid crystal panel is known from Japanese Patent Laid-Open No. 2006-106212 (Patent Document 2). In this conventional hollow backlight unit, monochromatic LEDs are dispersed and mixed to obtain a luminescent color. However, today, there is a strong demand for a narrower frame with a thinner LCD monitor. Even for backlight units, the LED positions at both ends overlap the inner peripheral edge of the frame, or the frame is slightly smaller than the LED at the end. There is only a dimensional margin to the extent that it is located outside. Under such conditions, when single-color LEDs are arranged in a row, the illuminance of the light from the LED at the row end position alone is low, and as a result, near the inner periphery of the frame along the optical axis of the LED. There was a problem that the illuminance partially darkened. Japanese Patent Application Laid-Open No. 2005-228561 describes a technique of obtaining white light by mixing each color LED in a thickness direction and also in a longitudinal direction to mix colors. However, in this case as well, the same thing occurs for the LEDs at both ends of each row, resulting in a problem that the illuminance near the inner periphery of the frame along the optical axis of the LED partially darkens. . Conventionally, a hollow surface illuminating device in which a long light source is arranged on one side is known from Japanese Patent Application Laid-Open No. 8-171806 (Patent Document 3). In the case of this conventional example, a cold cathode discharge lamp is used as the light source. The LED light source unit in which many LEDs are arranged is not used.
JP 2005-316337 A JP 2006-106212 A JP-A-8-171806

本発明は、上記のような従来の技術的課題に鑑みてなされたもので、薄型化、狭額縁化に対応でき、かつ、発光面周辺つまり額縁近辺での照度低下がなくて発光面全体で均一照度の白色光が得られるサイドライト方式の中空式面照明装置を提供することを目的とする。   The present invention has been made in view of the above-described conventional technical problems, can cope with thinning and narrowing of the frame, and has no decrease in illuminance around the light emitting surface, that is, in the vicinity of the frame. An object of the present invention is to provide a side-light type hollow surface illumination device capable of obtaining white light with uniform illuminance.

尚、本願において、「サイドライト方式」とは、発光面の背部側方の光源ユニットから発光面に平行な方向に光を出射し、この光を屈折、反射、拡散させて発光面に導光する照明方式をいう。   In the present application, the “side light method” means that light is emitted from a light source unit on the back side of the light emitting surface in a direction parallel to the light emitting surface, and the light is refracted, reflected, diffused and guided to the light emitting surface. This refers to the lighting method used.

本発明は、中空のユニットケースの底面側に光反射面部材を配置し、前記ユニットケースの前記光反射面部材と対向する表側に発光面部材を配置し、前記ユニットケースにおける前記光反射面部材と発光面部材とで挟まれる空間を中空導光領域とし、配線基板に多数個のＬＥＤを列設実装したＬＥＤ光源ユニットを前記中空導光領域に隣接して、当該中空導光領域に出射するように配置し、前記ＬＥＤ光源ユニットの前記ＬＥＤそれぞれからの光をその光軸が前記ユニットケースの発光面部材の面に平行になるように集光する細長集光部材を前記ＬＥＤ光源ユニットの出射部に前記ＬＥＤの配列と平行に配置した中空式面照明装置において、前記ＬＥＤ光源ユニットは、赤色ＬＥＤ、緑色ＬＥＤ、青色ＬＥＤの多数個が所定の配列にて列設され、かつ、当該配列の両端位置それぞれには、それらに直に隣接するＬＥＤの発光色と異なる発光色の２色、若しくは３色のチップを同時にパッケージングしたマルチチップＬＥＤを配置したものであることを特徴とするものである。   The present invention provides a light reflecting surface member disposed on a bottom surface side of a hollow unit case, a light emitting surface member disposed on a front side of the unit case facing the light reflecting surface member, and the light reflecting surface member in the unit case. A space between the light emitting surface member and the light emitting surface member is a hollow light guide region, and an LED light source unit in which a large number of LEDs are arranged and mounted on a wiring board is adjacent to the hollow light guide region and emitted to the hollow light guide region. The LED light source unit emits an elongated condensing member that condenses the light from each of the LEDs of the LED light source unit so that the optical axis thereof is parallel to the surface of the light emitting surface member of the unit case. In the hollow surface illumination device arranged in parallel with the LED array, the LED light source unit includes a large number of red LEDs, green LEDs, and blue LEDs arranged in a predetermined array. In addition, multi-chip LEDs in which chips of two or three colors of light emission colors different from the light emission color of the LED immediately adjacent to each other are packaged at each end position of the array are arranged. It is characterized by.

上記発明の中空式面照明装置では、前記細長集光部材は、前記ＬＥＤそれぞれからの光をその光軸が前記ユニットケースの発光面部材の面に平行になるように集光するＬＥＤコリメータであり、前記ＬＥＤコリメータは、前記ＬＥＤそれぞれからの光を屈折させて体内に導入あるいは出射する屈折集光機能部と、体内に導入した光を全反射させて前記中空導光領域に出射させる全反射集光機能部とを有するものとすることができる。   In the hollow surface illumination device of the above invention, the elongated light condensing member is an LED collimator that condenses the light from each of the LEDs so that the optical axis thereof is parallel to the surface of the light emitting surface member of the unit case. The LED collimator includes a refractive condensing function unit that refracts light from each of the LEDs and introduces or emits the light into the body, and a total reflection collector that totally reflects the light introduced into the body and emits the light to the hollow light guide region. It can have an optical function part.

本発明の中空式面照明装置によれば、ＬＥＤ光源ユニットに赤色ＬＥＤ、緑色ＬＥＤ、青色ＬＥＤの多数個を所定の配列にて列設し、かつ、当該配列の両端それぞれの位置に、それらに直に隣接するＬＥＤの発光色と異なる発光色の２色、若しくは３色のチップを同時にパッケージングしたマルチチップＬＥＤを配置したことにより、多数のＬＥＤの列の両端位置それぞれのＬＥＤは他のＬＥＤの２倍若しくは３倍の輝度にて発光し、かつ、直隣接する位置のＬＥＤとは異なった２色若しくは白色にて発光するので、直隣接する位置のＬＥＤの発光色と混色して白色となり、端部の発光色が偏ることがなく、その結果として、ＬＥＤの光軸に沿った額縁の内周縁近くでも高い照度が保て、狭額縁化しても発光面周辺つまり額縁近辺での照度低下がなくて発光面全体で均一照度の白色光が得られる。   According to the hollow surface illumination device of the present invention, a large number of red LEDs, green LEDs, and blue LEDs are arranged in a predetermined arrangement on the LED light source unit, and at the respective positions at both ends of the arrangement, By arranging multi-chip LEDs in which chips of two or three colors of emission colors different from those of immediately adjacent LEDs are packaged at the same time, each LED at each end position of a number of LED rows is another LED. The LED emits light with a brightness twice or three times that of the LED and emits light in two colors or white that is different from the LED in the immediately adjacent position. As a result, the illuminant color at the edge is not biased, and as a result, high illuminance can be maintained near the inner periphery of the frame along the optical axis of the LED, and low illuminance around the light emitting surface, that is, near the frame, even when the frame is narrowed White light uniform illumination across the light emitting surface can be obtained without.

以下、本発明の実施の形態を図に基づいて詳説する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

（第１の実施の形態）図１、図２は本発明の第１の実施の形態の中空式面照明装置としての液晶表示装置用のバックライトユニット３０を示している。このバックライトユニット３０は、矩形のユニットケース１の底面中央で１つの辺に平行な線に沿い、山形に盛上り、その稜線の両側に遠ざかるほど漸次低くなる山形の光反射面部材２が配置してある。このユニットケース１の表開口面に発光面部材３が配置してある。そして、ユニットケース１に発光面部材３側からフロントフレーム４を被せ、ユニットケート１と一体化することで本実施の形態のバックライトユニットが組み上げられている。ユニットケース１内の、光反射面部材２と発光面部材３とで挟む空間部分は、中空導光領域１０となっている。   (First Embodiment) FIGS. 1 and 2 show a backlight unit 30 for a liquid crystal display device as a hollow surface illumination device according to a first embodiment of the present invention. This backlight unit 30 is provided with a mountain-shaped light reflecting surface member 2 that swells in a mountain shape along a line parallel to one side at the center of the bottom surface of the rectangular unit case 1 and gradually decreases toward the both sides of the ridgeline. It is. A light emitting surface member 3 is disposed on the front opening surface of the unit case 1. The unit case 1 is covered with the front frame 4 from the light emitting surface member 3 side, and is integrated with the unit kit 1 to assemble the backlight unit of the present embodiment. A space portion sandwiched between the light reflecting surface member 2 and the light emitting surface member 3 in the unit case 1 is a hollow light guide region 10.

光反射面部材２は、金属あるいは樹脂の基材に高反射性、かつ拡散反射性を有する材料、例えば白色ＰＥＴフィルムや白色インクを積層させ、かつ、発光面部材３での輝度分布が均一になるように、発光面部材３との距離を変化させる形状にしてある。光拡散反射性を有する材料としては、上記の他に、鏡面反射性を持つ高反射アルミニウム等に光透過性拡散材をコーティングしたものでもよい。   The light reflecting surface member 2 is formed by laminating a highly reflective and diffuse reflecting material such as a white PET film or white ink on a metal or resin base material, and the luminance distribution on the light emitting surface member 3 is uniform. In this way, the distance from the light emitting surface member 3 is changed. In addition to the above, the light diffusive reflective material may be a highly reflective aluminum having a specular reflectivity coated with a light transmissive diffusing material.

発光面部材３は、少なくとも光透過拡散板３Ａに対して、さらに拡散シート３Ｂ，３Ｃ、レンズシート３Ｄ等の光学シートを重ねて構成したものであり、中空導光領域１０を通り、山形の光反射面部材２に当たって反射して来た光を均一に拡散、出射させることで、発光面での輝度むらをなくし、均斉度を高くする働きをする。   The light emitting surface member 3 is formed by overlapping optical sheets such as diffusion sheets 3B and 3C and a lens sheet 3D on at least the light transmission diffusion plate 3A. By uniformly diffusing and emitting the light reflected by the reflecting surface member 2, the luminance unevenness on the light emitting surface is eliminated and the uniformity is increased.

ユニットケース１は、アルミニウム合金等の高熱伝導性の金属で形成されている。このユニットケース１における光反射面部材２の稜線に平行な両側面それぞれに、ＬＥＤ光源ユニット５が配置してある。このＬＥＤ光源ユニット５は、ユニットケース１の該当側面に収容できる幅を持つ細長い配線基板６上に多数個のＬＥＤ７を一列若しくは複数列に列設実装したものである。配線基板６は高熱伝導性のアルミ系、同系合金などの金属や、窒化アルミニウム等のセラミックにより形成してあり、高熱伝導性のユニットケース１の側壁にねじ止め、接着その他の手段で固定している。尚、この配線基板６とユニットケース１の側壁との間には高熱伝導性の両面テープ、シートあるいはグリースを介在させるのが好ましい。   The unit case 1 is formed of a metal having a high thermal conductivity such as an aluminum alloy. The LED light source units 5 are arranged on both side surfaces parallel to the ridge line of the light reflecting surface member 2 in the unit case 1. This LED light source unit 5 has a large number of LEDs 7 arranged in a row or a plurality of rows on a long and narrow wiring board 6 having a width that can be accommodated on a corresponding side of the unit case 1. The wiring board 6 is made of a metal such as a high thermal conductivity aluminum or similar alloy, or a ceramic such as aluminum nitride, and is fixed to the side wall of the high thermal conductivity unit case 1 by screwing, bonding or other means. Yes. In addition, it is preferable to interpose a highly heat-conductive double-sided tape, sheet or grease between the wiring board 6 and the side wall of the unit case 1.

ＬＥＤ光源ユニット５上に実装されるＬＥＤ７には、所望の白色色度に合成させるため、本実施の形態では配線基板６上に所定間隔で、赤色（Ｒ）のＬＥＤ、緑色（Ｇ）のＬＥＤ、青色（Ｂ）のＬＥＤをこの順に繰り返す配列で実装し、かつ、列の両端位置のＬＥＤ７Ｅ１，７Ｅ２には、ＲＧＢの全３色を同時にパッケージングした見た目に白色発光と映る３色マルチチップＬＥＤを実装している。   In this embodiment, the LED 7 mounted on the LED light source unit 5 is combined with a desired white chromaticity. In this embodiment, the red (R) LED and the green (G) LED are arranged on the wiring board 6 at predetermined intervals. , Blue (B) LEDs are mounted in an array that repeats in this order, and the LEDs 7E1 and 7E2 at both ends of the row are three-color multi-chip LEDs that appear as white light when packaged with all three colors of RGB simultaneously Has been implemented.

図４に示すように、このＬＥＤ光源ユニット５の長手方向の両端のＬＥＤ７Ｅ１，７Ｅ２の位置とユニットケース１のフロントフレーム４の内周縁４Ａとの位置関係は、フロントフレーム４の内周縁４Ａよりも内側（発光面部材３の中央寄りの位置）にＬＥＤ７Ｅ１，７Ｅ２が位置するようにして、いずれのＬＥＤもフロントフレーム４に隠れて発光が遮られないような位置関係にしている。図４には左側の片方だけしか図示されていないが、反対側の右側も同様である。   As shown in FIG. 4, the positional relationship between the positions of the LEDs 7E1 and 7E2 at both ends in the longitudinal direction of the LED light source unit 5 and the inner peripheral edge 4A of the front frame 4 of the unit case 1 is more than that of the inner peripheral edge 4A of the front frame 4. The LEDs 7E1 and 7E2 are positioned on the inner side (position closer to the center of the light emitting surface member 3) so that all the LEDs are hidden behind the front frame 4 and the light emission is not blocked. FIG. 4 shows only one of the left side, but the same applies to the right side of the opposite side.

本実施の形態のバックライトユニットでは、ＬＥＤ光源ユニット５におけるＬＥＤ７の配列をＲＧＢ３色それぞれの単色ＬＥＤを順繰りに繰り返す配列で列設し、かつ、端部位置のＬＥＤ７Ｅ１，７Ｅ２についてはＲＧＢ３色マルチチップＬＥＤを配置したことで、次の利点がある。中間位置のＬＥＤ７群については、各ＬＥＤ７からの発光はある程度円錐状に広がるので、隣接する他の色のＬＥＤ７の発光と混合し合い、列方向ではほぼ均一な照度と成り得る。ところが、両端位置のＬＥＤ７Ｅ１，７Ｅ２については、片側（図４では右側）には他のＬＥＤ７が隣接して存在するが、他側（図４では左側）には他のＬＥＤが隣接して存在していない。そのために、端部のＬＥＤ７Ｅ１が中間位置のＬＥＤ７と同じ発光輝度であれば、一方に隣接するＬＥＤ７が存在しないために混合した発光輝度が中間位置のＬＥＤの場合よりも低くなると共に、３色混合できないために白色からずれた発光色に色むらしてしまう。そこで、この端部位置のＬＥＤ７Ｅ１，７Ｅ２については自身の発光輝度が高いマルチチップＬＥＤを使用することで発光面端部での照度の低下を防止する。同時に、本実施の形態の場合には見た目に白色発光と映る３色マルチチップＬＥＤを端部位置のＬＥＤ７Ｅ１，７Ｅ２に採用することで、発光面端部でも色むらすることなく均一な白色発光を実現できる。   In the backlight unit of the present embodiment, the array of LEDs 7 in the LED light source unit 5 is arranged in an array in which the single color LEDs of RGB three colors are sequentially repeated, and the LEDs 7E1 and 7E2 at the end positions are RGB3 color multichips. The arrangement of the LED has the following advantages. Regarding the group of LEDs 7 at the intermediate position, the light emission from each LED 7 spreads in a conical shape to some extent, so that it mixes with the light emission of the LEDs 7 of other adjacent colors, and the illumination intensity can be almost uniform in the column direction. However, regarding the LEDs 7E1 and 7E2 at both ends, another LED 7 is adjacent to one side (right side in FIG. 4), but another LED is adjacent to the other side (left side in FIG. 4). Not. Therefore, if the LED 7E1 at the end is the same emission luminance as the LED 7 at the intermediate position, the mixed emission luminance is lower than that of the LED at the intermediate position because there is no LED 7 adjacent to one, and three-color mixing Since this is not possible, the color of the emitted light is uneven. Therefore, for the LEDs 7E1 and 7E2 at the end positions, a multi-chip LED having high light emission brightness is used to prevent a decrease in illuminance at the end of the light emitting surface. At the same time, in the case of the present embodiment, by adopting the three-color multi-chip LEDs that appear to emit white light to the LEDs 7E1 and 7E2 at the end positions, uniform white light emission can be achieved without color unevenness even at the end portions of the light emitting surface. realizable.

図１、図２に戻り、ＬＥＤ光源ユニット５の出射側と中空導光領域１０との間に、ＬＥＤ７の列を覆い、ＬＥＤ７より拡散放射された放射光を入光する凹溝８で構成される入射面が形成された細長いＬＥＤコリメータ９が細長集光部材として配置してある。このＬＥＤコリメータ９は、ＬＥＤ光源ユニット５に実装された多数のＬＥＤ７それぞれから拡散放射された光を入光するための凹溝８と、その凹溝８の上下両端に連接し湾曲した全反射面と、複数の湾曲面を繋ぎ合わせた放射面によって形成され、この放射面に高さに準じて略平行光に集光した光を中空導光領域１０に入光させるための光学部材であり、例えば、アクリルやポリカーボネートのような透明樹脂、あるいはガラスで形成されている。   Returning to FIG. 1 and FIG. 2, the LED light source unit 5 is formed with a concave groove 8 that covers the row of LEDs 7 and receives the radiated light diffused and emitted from the LEDs 7 between the emission side of the LED light source unit 5 and the hollow light guide region 10. A long and narrow LED collimator 9 on which an incident surface is formed is arranged as an elongated light collecting member. The LED collimator 9 includes a concave groove 8 for receiving light diffused and radiated from each of the plurality of LEDs 7 mounted on the LED light source unit 5 and a curved total reflection surface connected to the upper and lower ends of the concave groove 8 and curved. And an optical member that is formed by a radiation surface obtained by connecting a plurality of curved surfaces, and enters the hollow light guide region 10 with light condensed into substantially parallel light according to the height on the radiation surface, For example, it is made of a transparent resin such as acrylic or polycarbonate, or glass.

図５、図６に詳しく示してあるように、ＬＥＤコリメータ９のＬＥＤ７の列に面する入射部側に凹溝８が形成されている。この凹溝８の溝壁面は、ＬＥＤ７の光軸に近い角度の放射光を体内に導光する凸形状の入射面ＩｎＡと、ＬＥＤ７の光軸から離れた角度の放射光を体内に導光する平面形状の入射面ＩｎＢ１，ＩｎＢ２となっている。ＬＥＤコリメータ９の図において下側と上側に位置する側面は、体内の光を全反射するように湾曲した全反射面ＴＩＲ１，ＴＩＲ２となっている。ＬＥＤコリメータ９の出射部は、入射面ＩｎＡからの入射光に対応する凸形状の出射面ＥｘＡと、入射面ＩｎＢ１，ＩｎＢ２から入射した後、全反射面ＴＩＲ１，ＴＩＲ２で全反射した光に対応する凹曲面形状の出射面ＥｘＢ１，ＥｘＢ２となっている。   As shown in detail in FIGS. 5 and 6, a concave groove 8 is formed on the incident portion side facing the row of LEDs 7 of the LED collimator 9. The groove wall surface of the concave groove 8 guides the incident light InA having a convex shape for guiding the emitted light having an angle close to the optical axis of the LED 7 into the body and the emitted light having an angle away from the optical axis of the LED 7 into the body. It is a plane-shaped incident surface InB1, InB2. In the figure of the LED collimator 9, the side surfaces located on the lower side and the upper side are total reflection surfaces TIR1 and TIR2 that are curved so as to totally reflect the light in the body. The exit part of the LED collimator 9 corresponds to the convex exit surface ExA corresponding to the incident light from the entrance surface InA and the light totally incident on the entrance surfaces InB1 and InB2 and then totally reflected by the total reflection surfaces TIR1 and TIR2. The exit surfaces ExB1 and ExB2 are concave curved surfaces.

上記実施の形態のバックライトユニットでは、図６に詳しく示したように、ＬＥＤコリメータ９によって、ＬＥＤ光源ユニット５のＬＥＤ７からの光を中空導光領域１０の厚み方向に集光してこの中空導光領域１０に入射させる。つまり、ＬＥＤコリメータ９において、ＬＥＤ７から入射面ＩｎＡに入射した光ＲＹＡは、断面凸形状の入射面ＩｎＡ及び出射面ＥｘＡにて屈折し、中空導光領域１０の厚み方向に集光される。また入射面ＩｎＢ１，ＩｎＢ２に入射した光ＲＹＢ１，ＲＹＢ２は、全反射面ＴＩＲ１，ＴＩＲ２での全反射と出射面ＥｘＢ１，ＥｘＢ２での屈折により、中空導光領域１０の厚み方向に集光される。   In the backlight unit of the above embodiment, as shown in detail in FIG. 6, the light from the LED 7 of the LED light source unit 5 is condensed in the thickness direction of the hollow light guide region 10 by the LED collimator 9. The light is incident on the light region 10. That is, in the LED collimator 9, the light RYA incident on the incident surface InA from the LED 7 is refracted by the incident surface InA and the exit surface ExA having a convex cross section and is condensed in the thickness direction of the hollow light guide region 10. Lights RYB1 and RYB2 incident on the incident surfaces InB1 and InB2 are condensed in the thickness direction of the hollow light guide region 10 due to total reflection on the total reflection surfaces TIR1 and TIR2 and refraction on the output surfaces ExB1 and ExB2.

ＬＥＤコリメータ９から中空導光領域１０に出射した光ＲＹＡ，ＲＹＢ１，ＲＹＢ２は、形状を最適化した反射面部材２の反射面で発光面部材３の方向へ反射され、この発光面部材３の発光面から高輝度で、かつ輝度むらのない状態で出射される。   The light RYA, RYB1, RYB2 emitted from the LED collimator 9 to the hollow light guide region 10 is reflected in the direction of the light emitting surface member 3 by the reflecting surface of the reflecting surface member 2 whose shape is optimized, and the light emitting surface member 3 emits light. The light is emitted from the surface with high luminance and no luminance unevenness.

本実施の形態のバックライトユニットによれば、上記ＬＥＤコリメータ９の存在によって光源であるＬＥＤ７から広角度に放射される光を、光利用効率８０％以上という高効率かつ狭角度で集光させることができ、中空導光領域１０における反射損失を最低限に抑えることができ、従来の中空方式のバックライトユニットよりも輝度を向上させることができる。また、従来の中空方式のバックライトユニットでは、光源からできるだけ遠方に光を到達させるために中空導光領域の反射面を鏡面反射性、あるいはそれに近い反射特性にして、発光面に局所的な輝線などが発生していたが、本実施の形態のバックライトユニットの場合、光源の集光性が高いので、反射面を拡散反射性としても輝度均斉度を高くでき、かつ、局所的な輝線の発生も防止できる。   According to the backlight unit of the present embodiment, the light emitted from the LED 7 as the light source at a wide angle due to the presence of the LED collimator 9 is condensed at a high efficiency and a narrow angle with a light utilization efficiency of 80% or more. The reflection loss in the hollow light guide region 10 can be minimized, and the luminance can be improved as compared with the conventional hollow type backlight unit. Also, in the conventional hollow type backlight unit, in order to make the light reach as far as possible from the light source, the reflection surface of the hollow light guide region is made to have a specular reflection property or a reflection characteristic close to it, and the local emission line on the light emission surface. However, in the case of the backlight unit of the present embodiment, the light source has high condensing property, so that the brightness uniformity can be increased even if the reflecting surface is diffusely reflective, and the local emission line Occurrence can also be prevented.

図７（ａ）、（ｂ）は、本実施の形態のバックライトユニット３０における、発光面の相対する２側面それぞれに設けられた一対のＬＥＤ光源ユニット５による光源ラインに直角な方向（ＬＥＤ配列方向に直角あるいはＬＥＤの光軸方向に平行な方向）を輝度分布測定ライン３１とし、その輝度分布測定ライン３１上における一対のＬＥＤ光源ユニット５による光源ライン間の輝度分布を示している。尚、ＬＥＤ光源ユニット５はこの場合、図７（ａ）のバックライトユニット３０において上下それぞれの長辺の位置に相対向するように設置されている。これによれば、約９０００ｃｄ／ｍ２〜１１０００ｃｄ／ｍ２の範囲で均斉度の高い白色光の輝度分布が得られている。 7A and 7B show the direction perpendicular to the light source line by the pair of LED light source units 5 provided on the two opposite side surfaces of the light emitting surface in the backlight unit 30 of the present embodiment (LED arrangement). The luminance distribution measurement line 31 is a direction perpendicular to the direction or parallel to the optical axis direction of the LED, and the luminance distribution between the light source lines by the pair of LED light source units 5 on the luminance distribution measurement line 31 is shown. In this case, the LED light source unit 5 is installed so as to oppose the upper and lower long sides of the backlight unit 30 in FIG. According to this, a luminance distribution of white light having a high degree of uniformity is obtained in a range of about 9000 cd / m 2 to 11000 cd / m 2 .

（第２の実施の形態）本発明の第２の実施の形態のバックライトユニットについて、図８を用いて説明する。第２の実施の形態は、バックライトユニット３０の構成は第１の実施の形態と共通であり、図１、図２に示したものである。またＬＥＤコリメータ９に付いても第１の実施の形態と共通である。本実施の形態の特徴は、図８に示したＬＥＤ光源ユニット５にあり、多数個のＬＥＤ７の配列はＲＧＢ配列としながらも、列両端位置のＬＥＤ７Ｅ１，７Ｅ２については直隣接する単色ＬＥＤ７の発光色を含まない２色マルチチップＬＥＤを採用したことを特徴とする。すなわち、図８において端部位置のＬＥＤ７Ｅ１については、直隣接する単色ＬＥＤ７が青色（Ｂ）ＬＥＤであるので、この色を含まない２色、つまり、ＲＧ２色マルチチップＬＥＤを用いている。また反対側の端部位置のＬＥＤ７Ｅ２については、直隣接する単色ＬＥＤ７が緑色（Ｇ）ＬＥＤであるので、この色を含まない２色、つまり、ＲＢ２色マルチチップＬＥＤを用いている。   (Second Embodiment) A backlight unit according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, the configuration of the backlight unit 30 is the same as that of the first embodiment, and is shown in FIGS. The LED collimator 9 is also common to the first embodiment. The feature of this embodiment is in the LED light source unit 5 shown in FIG. 8, and the arrangement of a large number of LEDs 7 is an RGB arrangement, but the LEDs 7E1 and 7E2 at both ends of the column are the light emission colors of the immediately adjacent single-color LEDs 7. 2 color multichip LED which does not contain is used. That is, for the LED 7E1 at the end position in FIG. 8, since the immediately adjacent single color LED 7 is a blue (B) LED, two colors that do not include this color, that is, RG two-color multichip LEDs are used. For the LED 7E2 at the opposite end position, since the immediately adjacent single color LED 7 is a green (G) LED, two colors that do not include this color, that is, an RB two-color multichip LED is used.

本実施の形態のバックライトユニット３０においても、ＬＥＤ光源ユニット５におけるＬＥＤ７の配列をＲＧＢ３色それぞれの単色ＬＥＤを順繰りに繰り返す配列で列設し、かつ、端部位置のＬＥＤ７Ｅ１，７Ｅ２については直隣接する単色ＬＥＤの発光色を含まない残りの２色のマルチチップＬＥＤを配置したことで、発光輝度が高いマルチチップＬＥＤが両端部に位置することで発光面端部での照度の低下が防止でき、同時に、端部においても直隣接する単色発光のＬＥＤとその色を含まない残りの２色を発光するマルチチップＬＥＤの発光色との混合により白色発光とすることができ、発光面端部でも色むらすることなく均一な白色発光を実現できる。   Also in the backlight unit 30 of this embodiment, the LEDs 7 in the LED light source unit 5 are arranged in an array in which the RGB single color LEDs are sequentially repeated, and the LEDs 7E1 and 7E2 at the end positions are directly adjacent to each other. By arranging the remaining two-color multi-chip LEDs that do not include the emission color of the single-color LED, the multi-chip LEDs with high emission brightness are located at both ends, so that the illuminance can be prevented from decreasing at the edge of the light-emitting surface. At the same time, white light emission can be achieved by mixing the light emission color of the single-color LED directly adjacent to the edge and the light emission color of the multi-chip LED that emits the remaining two colors not including that color. Uniform white light emission can be realized without color unevenness.

（第３の実施の形態）本発明の第３の実施の形態のバックライトユニット３０Ａについて、図９を用いて説明する。本実施の形態のバックライトユニット３０Ａは、ユニットケース１Ａの底部に片スロープになった反射面部材２Ａを設置し、ユニットケース１Ａの片サイドに設置したＬＥＤ光源ユニット５のＬＥＤから中空導光領域１０に光を入射させ、反射面部材２Ａにて発光面部材３側に反射させる片側入射タイプの構造である。本実施の形態において、ＬＥＤ光源ユニット５は図３に示した第１の実施の形態と同様のものを採用している。しかしながら、このＬＥＤ光源ユニット５には、図８に示した第２の実施の形態と同様のものを採用することもできる。図９に示した本実施の形態にあって、その他の構成は第１、第２の実施の形態と共通であり、共通する要素には同一の符号を付して示してある。   (Third Embodiment) A backlight unit 30A according to a third embodiment of the present invention will be described with reference to FIG. In the backlight unit 30A of the present embodiment, a reflecting surface member 2A having a single slope is installed at the bottom of the unit case 1A, and a hollow light guide region is formed from the LED of the LED light source unit 5 installed on one side of the unit case 1A. 10 is a one-side incident type structure in which light is incident on 10 and reflected to the light emitting surface member 3 side by the reflecting surface member 2A. In the present embodiment, the LED light source unit 5 is the same as that of the first embodiment shown in FIG. However, the LED light source unit 5 may be the same as that of the second embodiment shown in FIG. In the present embodiment shown in FIG. 9, other configurations are the same as those in the first and second embodiments, and common elements are denoted by the same reference numerals.

尚、上記第１〜第３の実施の形態において採用したＬＥＤ光源ユニット５では、中間位置のＬＥＤ７はＲＧＢ各色が１個ずつ順繰りに並ぶ配列としたが、中間位置のＬＥＤの配列はこれに限定されるものではなく、例えば、ＲＢＧ各色が１個ずつ順繰りに並ぶ配列であってもよい。また、中間位置両端、つまり単位部位置の直隣接する位置のＬＥＤが異なる発光色になってもよい。さらに、一般的に白色の明るさを強くするためには緑色（Ｇ）ＬＥＤを他の発光色のＬＥＤよりも多く使用することが行われているが、その場合、ＲＧＧＢＲＧＧＢ…とする配列を採用したり、ＲＧＢＧＲＧＢＧ…とする配列を採用したりすることもできる。そして、中間位置のＬＥＤの配列がどのようなものであれ、列両端位置のＬＥＤ７Ｅ１，７Ｅ２それぞれについては、直隣接する単色発光ＬＥＤの発光色を含まない残り２色を同時に発光するマルチチップＬＥＤを採用し、又はＲＧＢ３色同時発光する３色マルチチップＬＥＤを採用することができる。   In the LED light source unit 5 employed in the first to third embodiments, the intermediate position LEDs 7 are arranged in order of RGB colors one by one, but the intermediate position LEDs are limited to this arrangement. For example, an arrangement in which each RBG color is arranged one by one in order is also possible. In addition, LEDs at both ends of the intermediate position, that is, at positions immediately adjacent to the unit portion position, may have different emission colors. Furthermore, in general, in order to increase the brightness of white, more green (G) LEDs are used than LEDs of other emission colors. In this case, an arrangement of RGGBRGB ... is adopted. Or an array of RGBGRGBG... Can be adopted. Whatever the arrangement of the LEDs at the intermediate position, for each of the LEDs 7E1 and 7E2 at both ends of the column, a multi-chip LED that simultaneously emits the remaining two colors not including the emission color of the immediately adjacent single-color LED is used. It is possible to adopt a three-color multichip LED that emits light of RGB three colors simultaneously.

また、第１〜第３の実施の形態では、細長集光部材としてＬＥＤコリメータ９を採用したが、これについては単純な長尺の集光レンズ部材を採用することも可能である。   In the first to third embodiments, the LED collimator 9 is employed as the elongated condensing member. However, a simple long condensing lens member may be employed for this.

また、上記の各実施の形態は液晶ディスプレイ用のバックライトユニットについて説明したが、上記実施の形態の構成の中空式面照明装置として他の用途、例えば天井照明、床照明、壁面照明、フィルムの背面照明等にも応用することができる。   Moreover, although each said embodiment demonstrated the backlight unit for liquid crystal displays, as a hollow surface illuminating device of the structure of the said embodiment, other uses, for example, ceiling lighting, floor lighting, wall surface lighting, a film, It can also be applied to back lighting.

本発明の第１の実施の形態のバックライトユニットの分解斜視図。The disassembled perspective view of the backlight unit of the 1st Embodiment of this invention. 上記実施の形態のバックライトユニットの断面図。Sectional drawing of the backlight unit of the said embodiment. 上記実施の形態のバックライトユニットにおけるＬＥＤ光源ユニットの斜視図。The perspective view of the LED light source unit in the backlight unit of the said embodiment. 上記実施の形態のバックライトユニットにおけるＬＥＤ光源ユニットの端部相当部分の拡大断面図。The expanded sectional view of the edge part equivalent part of the LED light source unit in the backlight unit of the said embodiment. 上記実施の形態のバックライトユニットにおけるＬＥＤコリメータの一部破断斜視図。The partially broken perspective view of the LED collimator in the backlight unit of the said embodiment. 上記実施の形態におけるＬＥＤコリメータの集光特性を示す断面図。Sectional drawing which shows the condensing characteristic of the LED collimator in the said embodiment. 上記実施の形態のバックライトユニットの輝度分布特性を示すグラフ。The graph which shows the luminance distribution characteristic of the backlight unit of the said embodiment. 本発明の第２の実施の形態のバックライトユニットにおいて採用したＬＥＤ光源ユニットの斜視図。The perspective view of the LED light source unit employ | adopted in the backlight unit of the 2nd Embodiment of this invention. 本発明の第３の実施の形態のバックライトユニットの断面図。Sectional drawing of the backlight unit of the 3rd Embodiment of this invention.

符号の説明Explanation of symbols

１，１Ａ ユニットケース
２ 反射面部材
３ 発光面部材
４ フロントフレーム
４Ａ 内周縁
５ ＬＥＤ光源ユニット
６ 配線基板
７ （単色発光、中間位置の）ＬＥＤ
７Ｅ１，７Ｅ２ （端部位置の）ＬＥＤ
９ ＬＥＤコリメータ
１０ 中空導光領域
３０，３０Ａ バックライトユニット DESCRIPTION OF SYMBOLS 1,1A Unit case 2 Reflecting surface member 3 Light emitting surface member 4 Front frame 4A Inner peripheral edge 5 LED light source unit 6 Wiring board 7 (single color light emission, intermediate position) LED
7E1, 7E2 (end position) LEDs
9 LED collimator 10 Hollow light guide area 30, 30A Backlight unit

Claims (2)

中空のユニットケースの底面側に光反射面部材を配置し、前記ユニットケースの前記光反射面部材と対向する表側に発光面部材を配置し、前記ユニットケースにおける前記光反射面部材と発光面部材とで挟まれる空間を中空導光領域とし、配線基板に多数個のＬＥＤを列設実装したＬＥＤ光源ユニットを前記中空導光領域に隣接して、当該中空導光領域に出射するように配置し、前記ＬＥＤ光源ユニットの前記ＬＥＤそれぞれからの光をその光軸が前記ユニットケースの発光面部材の面に平行になるように集光する細長集光部材を前記ＬＥＤ光源ユニットの出射部に前記ＬＥＤの配列と平行に配置した中空式面照明装置において、
前記ＬＥＤ光源ユニットは、赤色ＬＥＤ、緑色ＬＥＤ、青色ＬＥＤの多数個が所定の配列にて列設され、かつ、当該配列の両端位置それぞれには、それらに直に隣接するＬＥＤの発光色と異なる発光色の２色、若しくは３色のチップを同時にパッケージングしたマルチチップＬＥＤを配置したものであることを特徴とする中空式面照明装置。 A light reflecting surface member is disposed on the bottom surface side of the hollow unit case, a light emitting surface member is disposed on the front side of the unit case facing the light reflecting surface member, and the light reflecting surface member and the light emitting surface member in the unit case are disposed. The LED light source unit in which a large number of LEDs are arranged and mounted on the wiring board is arranged adjacent to the hollow light guide region and emitted to the hollow light guide region. The LED light source unit has an elongated condensing member for condensing the light from each of the LEDs of the LED light source unit so that the optical axis thereof is parallel to the surface of the light emitting surface member of the unit case. In the hollow surface illumination device arranged in parallel with the arrangement of
In the LED light source unit, a large number of red LEDs, green LEDs, and blue LEDs are arranged in a predetermined arrangement, and each of the both end positions of the arrangement is different from the emission color of the LED immediately adjacent thereto. A hollow surface illumination device comprising multi-chip LEDs in which chips of two or three colors of luminescent colors are packaged simultaneously. 前記細長集光部材は、前記ＬＥＤそれぞれからの光をその光軸が前記ユニットケースの発光面部材の面に平行になるように集光するＬＥＤコリメータであり、
前記ＬＥＤコリメータは、前記ＬＥＤそれぞれからの光を屈折させて体内に導入あるいは出射する屈折集光機能部と、体内に導入した光を全反射させて前記中空導光領域に出射させる全反射集光機能部とを有することを特徴とする請求項１記載の中空式面照明装置。 The elongated condensing member is an LED collimator that condenses the light from each of the LEDs so that the optical axis thereof is parallel to the surface of the light emitting surface member of the unit case,
The LED collimator refracts light from each LED and introduces or emits light into the body, and totally reflects and condenses the light introduced into the body and emits the light to the hollow light guide region. The hollow surface illumination device according to claim 1, further comprising a functional unit.
JP2007271246A 2007-10-18 2007-10-18 Hollow type surface lighting device Pending JP2009099446A (en)

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WO2011043140A1 (en) * 2009-10-06 2011-04-14 シャープ株式会社 Illumination device, display device, and television receiver
US8752973B2 (en) 2009-10-06 2014-06-17 Sharp Kabushiki Kaisha Lighting device, display device and television receiver
JP2011134481A (en) * 2009-12-22 2011-07-07 Lecip Holdings Corp Lighting system
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