JP5030204B2 - Light emitting diode light source, backlight and liquid crystal display - Google Patents
Light emitting diode light source, backlight and liquid crystal display Download PDFInfo
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Description
本発明は液晶ディスプレイ用の光源、バックライト及びそのバックライトを用いた液晶ディスプレイに関する。 The present invention relates to a light source for a liquid crystal display, a backlight, and a liquid crystal display using the backlight.
近年、発光ダイオード素子は発光効率が著しく向上し、照明への応用が進んでいる。特に、液晶ディスプレイ用のバックライト光源として発光ダイオード（ＬＥＤ）を用いた場合には、良好な色再現性と高速応答性が実現でき、高品位な画質を達成することが期待されている。また、水銀を使用していないため環境に優しく、自動車に用いられる車内照明やヘッドライト用光源としての利用も進みつつある。 In recent years, light emitting diode elements have significantly improved luminous efficiency, and their application to lighting has been advanced. In particular, when a light emitting diode (LED) is used as a backlight light source for a liquid crystal display, good color reproducibility and high-speed response can be realized, and high quality image quality is expected. In addition, since mercury is not used, it is environmentally friendly, and its use as a light source for interior lighting and headlights used in automobiles is also progressing.
バックライト用光源として発光ダイオードを使用する場合、通常は赤（Ｒ）、緑（Ｇ）、青（Ｂ）の発光色を有する多数の発光ダイオードを、扁平な直方体からなるバックライト筐体の内側底面上に実装し、発光ダイオードから一定の距離を隔ててレンズシートや拡散板を置いている。 When a light-emitting diode is used as a light source for backlight, a large number of light-emitting diodes having emission colors of red (R), green (G), and blue (B) are usually arranged inside a backlight casing made of a flat rectangular parallelepiped. It is mounted on the bottom surface, and a lens sheet and a diffusion plate are placed at a certain distance from the light emitting diode.
拡散板は異なる色光を混合して白色光を形成し、かつ白色光の輝度を均一化するために用いられる。また、筐体内面には反射率が９５％以上の反射板あるいは反射シートを貼りつけて光の利用効率を高めている。
従来、発光ダイオードは、図９に部分側断面図を示すように筐体の内面（３）に全体が載置されていた。
すなわち、発光ダイオード（４）を構成するレンズ部（４ａ）、パッケージ部（４ｂ）及び端子（４ｃ）すべてが筐体内に配置されている。
The diffuser plate is used to mix different color lights to form white light and to make the brightness of the white light uniform. In addition, a reflection plate or a reflection sheet having a reflectance of 95% or more is attached to the inner surface of the housing to enhance the light utilization efficiency.
Conventionally, the entire light emitting diode has been mounted on the inner surface (3) of the housing as shown in a partial side sectional view in FIG.
That is, the lens part (4a), the package part (4b), and the terminal (4c) that constitute the light emitting diode (4) are all disposed in the housing.
しかし、光を放射する部分は発光ダイオードのレンズ部（４ａ）であり、レンズ部より下に位置するパッケージ部（４ｂ）は光を放射せず、むしろ吸収してしまう。すなわち、従来の構成においては、発光ダイオード（４）のパッケージ部（４ｂ）が筐体内面の反射板または反射シートの上面に出ているため、パッケージ部に光が吸収される光の損失があった。 However, the portion that emits light is the lens portion (4a) of the light emitting diode, and the package portion (4b) located below the lens portion does not emit light, but rather absorbs it. That is, in the conventional configuration, since the package portion (4b) of the light emitting diode (4) protrudes from the upper surface of the reflection plate or reflection sheet on the inner surface of the housing, there is a loss of light that is absorbed by the package portion. It was.
また、発光ダイオードは点光源であるため、混色による白色光の形成と輝度の均一化が困難であった（例えば、「高輝度ＬＥＤ組立・実装技術徹底検証」，Electronic Journal 97th Technical Symposium p.73，2005年2月28日：非特許文献１）。すなわち、Ｒ，Ｇ，Ｂの発光ダイオードを組み合わせた白色光源によりバックライトを構成する場合、Ｒ，Ｇ，Ｂの３種類の発光ダイオードの特定の組合せを基本構成単位（単位光源と呼ぶ）とし、これをバックライト筐体底面の基材上に単位光源を等間隔に複数個配置して平面状光源を得るのが通常である。単位光源としては、Ｒ，Ｇ，Ｂ各１個ずつで１単位としたもの、Ｒ１個、Ｇ２個、Ｂ１個で１単位としたもの、Ｒ２個、Ｇ２個、Ｂ１個で１単位としたものなどを挙げることができる。通常、単位光源内における各色発光ダイオードの配列は一定としている。例えば、単位光源がＲ２個、Ｇ２個、Ｂ１個を線状に配置したものである場合には、Ｒ，Ｇ，Ｂ，Ｇ，Ｒの順番で配置し、単位光源によってこの順番を変えることはない。しかし、筐体の壁に隣接する（壁に最も近い位置にある）単位光源において、発光ダイオードの種類によって壁からの距離に差があることが色むらの原因となる。 Further, since the light emitting diode is a point light source, it is difficult to form white light by mixing colors and to make the luminance uniform (for example, “High-brightness LED assembly / mounting technology thorough verification”, Electronic Journal 97th Technical Symposium p.73). , February 28, 2005: Non-patent document 1). That is, when a backlight is configured with a white light source in which R, G, and B light emitting diodes are combined, a specific combination of three types of R, G, and B light emitting diodes is used as a basic structural unit (referred to as a unit light source). In general, a planar light source is obtained by arranging a plurality of unit light sources at regular intervals on the base material of the bottom surface of the backlight housing. As the unit light source, R, G, and B are set as one unit, R1, G2, and B1 are set as one unit, and R2, G2, and B1 are set as one unit. And so on. Usually, the arrangement of the light emitting diodes in each unit light source is constant. For example, when the unit light sources are R2, G2, and B1 arranged in a line, they are arranged in the order of R, G, B, G, R, and this order can be changed depending on the unit light source. Absent. However, in a unit light source adjacent to the wall of the housing (located closest to the wall), color unevenness is caused by a difference in distance from the wall depending on the type of light emitting diode.
さらに、輝度と色度を均一化するために拡散度の大きい拡散板を使用する場合には、輝度が低下するという問題を生ずる。 Furthermore, when a diffuser plate having a large diffusion degree is used to make the luminance and chromaticity uniform, there arises a problem that the luminance is lowered.
従って、本発明の課題は、これらの問題を解決するために、光の利用効率が高められた発光ダイオード光源を提供し、正面輝度に優れる発光ダイオード光源を提供し、更には輝度均一性及び混色度合いに優れた発光ダイオード光源を提供し、あるいはそれらを用いたバックライトを提供することにある。 Therefore, in order to solve these problems, an object of the present invention is to provide a light-emitting diode light source with improved light utilization efficiency, to provide a light-emitting diode light source with excellent front luminance, and further to luminance uniformity and color mixing. The object is to provide a light emitting diode light source having an excellent degree or to provide a backlight using them.
本発明者らは、発光ダイオードの配置の工夫により、発光ダイオード自体の光吸収を低減し輝度が改良されること、及び仕切り板の設置により輝度および色度を均一化できることを見出し、本発明を完成するに至った。
すなわち、本発明は例えば以下の事項を含むものである。
The present inventors have found that the light absorption of the light emitting diode itself can be reduced by improving the arrangement of the light emitting diode to improve the luminance, and that the luminance and chromaticity can be made uniform by installing the partition plate. It came to be completed.
That is, the present invention includes, for example, the following matters.
１．基板とその基板に配置された発光ダイオードとを有する光源であって、前記発光ダイオードはレンズ部とパッケージ部を有し、かつ前記発光ダイオードのパッケージ部の一部または全部が前記基板に埋設されていることを特徴とする発光ダイオード光源。
２．基板とその基板に配置された発光ダイオードとその発光ダイオードの上方に距離を隔てて配置された拡散部材とを有する光源であって、前記発光ダイオードはレンズ部とパッケージ部を有し、前記パッケージ部の一部または全部が前記基板に埋設されており、前記拡散部材と発光ダイオードとの間に第２の拡散部材を具備することを特徴とする発光ダイオード光源。
３．前記発光ダイオードは前記レンズ部のみが前記基板の上側に突出していることを特徴とする前記１または２に記載の発光ダイオード光源。
４．前記第２の拡散部材が透明樹脂板に拡散層を形成したものである前記２に記載の発光ダイオード光源。
５．前記拡散部材および第２の拡散部材のヘイズ値が５０〜９０％である前記２または４に記載の発光ダイオード光源。
６．前記拡散層のヘイズ値が５０〜９０％である前記４に記載の発光ダイオード光源。
７．前記１〜６のいずれか１項に記載の発光ダイオード光源を用いたバックライト。
８．筐体内に複数の発光ダイオードが配置され、かつ前記発光ダイオード間に仕切り部材を具備する前記７に記載のバックライト。
９．前記発光ダイオードが複数の異なる発光色のものからなり、かつそれらの組合せからなる単位光源を等間隔で複数個載置して得られるバックライトであって、前記筐体の壁面または仕切り部材に隣接する箇所とその他の箇所での単位光源の構成が異なる前記８に記載のバックライト。
１０．前記単位光源が赤色（Ｒ）、緑色（Ｇ）及び青色（Ｂ）発光ダイオードの組み合わせからなり、前記壁面または仕切り部材に隣接する単位光源の赤色（Ｒ）発光ダイオードが前記壁面または仕切り部材に隣接しない位置になるよう単位光源が設置されている前記９に記載のバックライト。
１１．前記７〜１０のいずれか１項に記載のバックライトを備えた液晶ディスプレイ。
1. A light source having a substrate and a light emitting diode disposed on the substrate, wherein the light emitting diode has a lens portion and a package portion, and a part or all of the package portion of the light emitting diode is embedded in the substrate. A light-emitting diode light source.
2. A light source including a substrate, a light emitting diode disposed on the substrate, and a diffusion member disposed at a distance above the light emitting diode, wherein the light emitting diode includes a lens unit and a package unit, and the package unit A part or the whole of the light emitting diode is embedded in the substrate, and a second diffusion member is provided between the diffusion member and the light emitting diode.
3. 3. The light emitting diode light source according to 1 or 2, wherein only the lens portion of the light emitting diode protrudes above the substrate.
4). The light emitting diode light source according to 2, wherein the second diffusion member is a transparent resin plate formed with a diffusion layer.
5. 5. The light emitting diode light source according to 2 or 4, wherein the diffusing member and the second diffusing member have a haze value of 50 to 90%.
6). 5. The light-emitting diode light source according to 4 above, wherein the diffusion layer has a haze value of 50 to 90%.
7). The backlight using the light emitting diode light source of any one of said 1-6.
8). 8. The backlight according to 7, wherein a plurality of light emitting diodes are disposed in a housing, and a partition member is provided between the light emitting diodes.
9. The light emitting diode is a backlight obtained by placing a plurality of unit light sources composed of a plurality of different light emission colors at equal intervals, and adjacent to the wall surface of the housing or the partition member 9. The backlight according to 8 above, wherein the configuration of the unit light source is different from that at other locations.
10. The unit light source is a combination of red (R), green (G) and blue (B) light emitting diodes, and the red (R) light emitting diode of the unit light source adjacent to the wall surface or partition member is adjacent to the wall surface or partition member. 10. The backlight according to 9 above, wherein a unit light source is installed so as not to be in a position.
11. The liquid crystal display provided with the backlight of any one of said 7-10.
本発明の発光ダイオード光源は、発光ダイオードより発する光の利用効率を高め、かつ輝度および色度均一化に優れるので、液晶ディスプレイのバックライトとして有用である。 The light-emitting diode light source of the present invention is useful as a backlight of a liquid crystal display because it enhances the utilization efficiency of light emitted from the light-emitting diode and is excellent in uniformity of luminance and chromaticity.
以下、添付図面（図１〜図３）をも参照しながら本発明を説明する。
本発明の発光ダイオード光源は、基板（１）と該基板（１）に配置された発光ダイオード（４）を有する光源であって、発光ダイオード（４）はレンズ部（４ａ）とパッケージ部（４ｂ）を有し、かつ、該発光ダイオード（４）のパッケージ部（４ｂ）の一部または全部が前記基板（１）に埋設されていることを特徴とする。好ましくは、レンズ部（４ａ）のみが基板（１）の上側に突出していることを特徴とする。
本発明の発光ダイオード光源に用いる基板（１）としては、特に限定されるものではないが、バックライトなどの筺体（２）の場合には、通常高反射率の反射シート（３）を内面に貼り付けた金属が用いられる。金属としては、典型的にはアルミニウムが用いられるが、同様に軽量で十分な強度を有するものであればよい（以下の説明で、アルミニウムを用いる場合は、すべて同様である。）。なお、基板としては、筐体（２）の一部をなすもののほか、筐体内に別に基板を設けてもよい。また、ＬＥＤの下部を固定または支持する基板の上にＬＥＤの上部を支持する基板を設け、後者にＬＥＤのパッケージ部の全部または一部が埋設される構造としてもよい。
The present invention will be described below with reference to the accompanying drawings (FIGS. 1 to 3).
The light-emitting diode light source of the present invention is a light source having a substrate (1) and a light-emitting diode (4) disposed on the substrate (1). The light-emitting diode (4) includes a lens portion (4a) and a package portion (4b). ) And part or all of the package portion (4b) of the light emitting diode (4) is embedded in the substrate (1). Preferably, only the lens portion (4a) protrudes above the substrate (1).
The substrate (1) used for the light-emitting diode light source of the present invention is not particularly limited, but in the case of a casing (2) such as a backlight, a reflection sheet (3) having a high reflectance is usually provided on the inner surface. Affixed metal is used. As the metal, aluminum is typically used, but any metal that is similarly lightweight and has sufficient strength may be used (in the following description, the same applies when aluminum is used). In addition, as a board | substrate, you may provide a board | substrate separately in a housing | casing other than what makes a part of housing | casing (2). Moreover, it is good also as a structure which provides the board | substrate which supports the upper part of LED on the board | substrate which fixes or supports the lower part of LED, and embeds all or one part of the package part of LED in the latter.
本願発明の一例の発光ダイオードの模式断面図を図１に示す。発光ダイオード（４）のレンズ部（４ａ）のみが基板（１）の上側に突出しており、パッケージ部（４ｂ）は基板（１）内に埋め込まれた構造になっている。
このように、発光ダイオードのレンズ部（４ａ）だけを基板（１）の上に出るように配置することにより、発光ダイオードのパッケージ部（４ｂ）による光の吸収をなくすことが可能となる。なお、この図ではパッケージ部（４ｂ）は完全に基板（１）内に埋め込まれた形としているが、パッケージ部（４ｂ）の一部を基板に埋設させた場合は、パッケージ部（４ｂ）による光の吸収を低減する効果がある。
A schematic cross-sectional view of a light emitting diode as an example of the present invention is shown in FIG. Only the lens portion (4a) of the light emitting diode (4) protrudes above the substrate (1), and the package portion (4b) is embedded in the substrate (1).
Thus, by arranging only the lens portion (4a) of the light emitting diode so as to protrude onto the substrate (1), it becomes possible to eliminate light absorption by the package portion (4b) of the light emitting diode. In this figure, the package part (4b) is completely embedded in the substrate (1). However, when a part of the package part (4b) is embedded in the substrate, the package part (4b) is used. There is an effect of reducing light absorption.
また、輝度と色度を均一化するには、図２に示すように、通常設置される拡散部材（板、フィルム）（５）のほかに、拡散部材（５）と基板（１）との中間に第２の拡散部材（板、フィルム）（６）を設置することが好ましい。なお、ここで言う板とは部材の厚みが相対的に厚いもの、フィルムとは部材の厚みが相対的に薄いものを意味するが、本発明では種々の厚みのものを使用することができる。
第２の拡散部材（６）としては、ポリメチルメタクリレート等の透明樹脂板に拡散層を形成したものが挙げられる。拡散層の形成には拡散フィルムを積層する方法、あるいは液状樹脂を塗布し乾燥して形成する方法などが挙げられる。これらの中でも、拡散フィルムを積層した拡散部材が好ましい。
第２の拡散部材（６）はＬＥＤ（４）と拡散部材（５）との間の任意の位置に設けることができるが、ＬＥＤ（４）−拡散部材（５）間距離の１０〜３０％程度の位置に設けることが好ましい。
Further, in order to make the luminance and chromaticity uniform, as shown in FIG. 2, in addition to the normally installed diffusion member (plate, film) (5), the diffusion member (5) and the substrate (1) It is preferable to install a second diffusion member (plate, film) (6) in the middle. In addition, although the board said here means the thing whose thickness of a member is relatively thick, and a film mean the thing whose thickness of a member is relatively thin, the thing of various thickness can be used in this invention.
Examples of the second diffusing member (6) include those obtained by forming a diffusion layer on a transparent resin plate such as polymethyl methacrylate. For the formation of the diffusion layer, a method of laminating a diffusion film or a method of forming a diffusion layer by applying a liquid resin can be used. Among these, the diffusion member which laminated | stacked the diffusion film is preferable.
The second diffusing member (6) can be provided at any position between the LED (4) and the diffusing member (5), but 10-30% of the distance between the LED (4) and the diffusing member (5). It is preferable to provide at a certain position.
拡散部材および第２の拡散部材のヘイズ値としては５０〜９０％が好ましい。ヘイズ値は、（拡散した光束/全光束）比を％表示したもので、「拡散した光束」とは直進光成分を除いた光束であり、ＪＩＳ−Ｋ７１０５の方法に準ずるヘイズメータ（例：ＨＭ−１５０、株式会社村上色彩技術研究所製）で測定できる。ヘイズ値が５０％未満では均一化が十分でなく、色むらと輝度むらを生じる。一方、９０％を超えると平均輝度が低下してしまうので好ましくない。拡散部材を透明樹脂板に拡散層を形成した構成とする場合は、拡散層のヘイズ値を５０〜９０％とすることが好ましい。この構成により拡散板全体としてのヘイズ値を５０〜９０％とすることができる。 The haze value of the diffusing member and the second diffusing member is preferably 50 to 90%. The haze value is a percentage of the (diffused light flux / total light flux) ratio. The “diffused light flux” is a light flux excluding a straight light component, and is a haze meter according to the method of JIS-K7105 (example: HM- 150, manufactured by Murakami Color Research Laboratory Co., Ltd.). If the haze value is less than 50%, homogenization is not sufficient, and uneven color and uneven brightness occur. On the other hand, if it exceeds 90%, the average luminance is lowered, which is not preferable. When the diffusion member is configured to have a diffusion layer formed on a transparent resin plate, the haze value of the diffusion layer is preferably 50 to 90%. With this configuration, the haze value of the entire diffusion plate can be 50 to 90%.
さらに、図３に示すように筐体（２）内に、その壁面に平行に発光ダイオードを仕切る仕切り部材（板）（７）を設けることも好ましい。仕切り部材（板）としては、例えば厚さ０．２〜５ｍｍのアルミニウムに白色両面塗装したもの、アルミニウムの両面に白色反射シートを貼り合わせたものを平板のまま、または山型に折り曲げ加工したものを使用することができる。この仕切り部材（板）の高さとしては、筐体底面から拡散部材または透明樹脂板までの高さの１０〜１００％、好ましくは１０〜８０％である。 Furthermore, as shown in FIG. 3, it is also preferable to provide a partition member (plate) (7) for partitioning the light emitting diode in parallel with the wall surface in the housing (2). As a partition member (plate), for example, a white double-sided coating on aluminum having a thickness of 0.2 to 5 mm, and a white reflective sheet bonded to both sides of aluminum as a flat plate or bent into a mountain shape Can be used. The height of the partition member (plate) is 10 to 100%, preferably 10 to 80%, of the height from the bottom surface of the housing to the diffusion member or the transparent resin plate.
また、発光ダイオードが複数の異なる発光色のものからなる場合、壁際において生じる色むらを防ぐには、それらの組合せからなる壁面に近接した位置にある単位光源において、赤色発光ダイオードを壁からできるだけ離れた位置におくことが好ましい。従って、例えば通常の単位光源がＲ，Ｇ，Ｂ，Ｇ，Ｒで線状配置されている場合、壁際においては単位光源内における配列を例えばＧ，Ｒ，Ｂ，Ｒ，ＧのようにＲを壁面に隣接しない構成に変更することが好ましい。
単位光源は、直線状の配置の他、複数のＬＥＤを一定のパターンで配置したものでもよい。例えば、正多角形の各頂点にＬＥＤを配置するパターン、正多角形の頂点と中心にＬＥＤを配置するパターン等が挙げられる（図６〜７参照）。壁面や仕切り部材付近で単位光源の向きや配置を変えることにより、壁面等の近傍に赤色光源が位置しない光源を製造することができる。
In addition, when the light emitting diodes are of a plurality of different light emitting colors, in order to prevent color unevenness that occurs near the wall, in the unit light source located close to the wall surface that is a combination of them, the red light emitting diode is separated from the wall as much as possible. It is preferable to place it in a different position. Therefore, for example, when normal unit light sources are linearly arranged in R, G, B, G, and R, the arrangement in the unit light source is arranged at the wall near R, for example, G, R, B, R, and G. It is preferable to change to a configuration not adjacent to the wall surface.
The unit light source may be one in which a plurality of LEDs are arranged in a fixed pattern in addition to the linear arrangement. For example, the pattern which arrange | positions LED in each vertex of a regular polygon, the pattern which arrange | positions LED in the vertex and center of a regular polygon, etc. are mentioned (refer FIGS. 6-7). By changing the direction and arrangement of the unit light sources in the vicinity of the wall surface and the partition member, it is possible to manufacture a light source in which no red light source is located in the vicinity of the wall surface or the like.
以下、実施例及び比較例を挙げて本発明をさらに詳しく説明する。 Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.
実施例１：
内寸法２８０ｍｍ×２３４ｍｍ、深さ３０ｍｍのアルミニウム製筐体の内面に、東レ製白色反射フィルム（ルミラー（登録商標）６０Ｌ）を貼合せた。該筐体の底面に、短辺に沿って等間隔に３箇所、長辺に沿って１２ｍｍ間隔（ただし、両端の壁面からの距離は２６ｍｍ）で２０箇所、合計６０箇所に直径５ｍｍの丸穴を開けた。ここで言う距離とは、丸穴の中心を基準とした寸法である。長辺に沿ってＧＲＢＲＧ（ＬＵＸＥＯＮ ＥＭＩＴＴＥＲ：ＬＸＨＬ−ＢＭ０１（Ｇ：緑色ＬＥＤ），ＬＸＨＬ−ＢＢ０１（Ｂ：青色ＬＥＤ）、ＬＸＨＬ−ＢＤ０３（Ｒ：赤色ＬＥＤ）；ＬＵＭＩＬＥＤＳ社製）からなる単位光源を合計１２セット、レンズ部分のみが出るように筐体の裏面より固定した。その部分平面図を図４に示す。
次に、アルミニウム筐体内側底面から１０ｍｍの高さに厚さ０．５ｍｍのポリメチルメタクリレート製透明樹脂板を固定し、さらに、その直上にツジデン社製拡散フィルム（Ｄ１２３、１００μｍ厚、ヘイズ値８２．４％）を固定した。
Example 1:
A Toray white reflective film (Lumirror (registered trademark) 60L) was bonded to the inner surface of an aluminum casing having an inner dimension of 280 mm × 234 mm and a depth of 30 mm. Round holes with a diameter of 5 mm in a total of 60 locations on the bottom surface of the housing at 3 locations at equal intervals along the short side and 20 locations at 12 mm intervals along the long side (however, the distance from the wall surfaces at both ends is 26 mm) Opened. The distance mentioned here is a dimension based on the center of the round hole. A total of unit light sources consisting of GRBRG (LUXEON EMITTER: LXHL-BM01 (G: green LED), LXHL-BB01 (B: blue LED), LXHL-BD03 (R: red LED); manufactured by LUMILEDS) along the long side Twelve sets were fixed from the back of the housing so that only the lens part came out. A partial plan view thereof is shown in FIG.
Next, a polymethylmethacrylate transparent resin plate having a thickness of 0.5 mm is fixed to a height of 10 mm from the inner bottom surface of the aluminum casing, and further, a diffusion film (D123, 100 μm thickness, haze value 82 manufactured by Tsujiden Co., Ltd. is directly above it. .4%) was fixed.
さらに、アルミニウム筐体の内側底面から３０ｍｍの高さに帝人化成社製ポリカーボネート拡散板（ＰＣ９３９１−５０ＨＬ、２ｍｍ厚、ヘイズ値５７．５％）を固定して、バックライトユニットを得た。
コニカミノルタホールディングス株式会社製分光放射輝度計（分光タイプ）ＣＳ−１０００Ｓを用いて拡散板中央（拡散板の対角線の交点）での拡散板表面から約１ｍ離れた位置での色度座標が（ｘ＝０．３００，ｙ＝０．３００）になるように、赤ＬＥＤ、緑ＬＥＤ、青ＬＥＤそれぞれに２２０ｍＡ、１４３ｍＡ、１１０ｍＡの電流を流した。この時の拡散板中央（拡散板の対角線の交点）での拡散板表面から約１ｍ離れた位置での輝度をコニカミノルタホールディングス株式会社製分光放射輝度計（分光タイプ）ＣＳ−１０００Ｓを用いて測定した結果、３０２０ｃｄ／ｍ2であった。混色ムラは拡散板上で最も赤、緑、青い部分の色度座標を測定し、拡散板中央との差を比較評価した。最も赤い部分の色度座標は（ｘ＝０．３１０，ｙ＝０．２９０）であり中央との差異は（△ｘ＝０．０１、△ｙ＝０．０１）であった。同様に最も緑の部分は（ｘ＝０．３１０，ｙ＝０．３１０）、（△ｘ＝０．０１、△ｙ＝０．０１）、最も青の部分は（ｘ＝０．２９０，ｙ＝０．２９０）、（△ｘ＝０．０１、△ｙ＝０．０１）であった。
Furthermore, a Teijin Chemicals polycarbonate diffuser plate (PC9391-50HL, 2 mm thickness, haze value 57.5%) was fixed to a height of 30 mm from the inner bottom surface of the aluminum casing to obtain a backlight unit.
Using a spectral radiance meter (spectral type) CS-1000S manufactured by Konica Minolta Holdings Co., Ltd., the chromaticity coordinates at a position about 1 m away from the diffusion plate surface at the center of the diffusion plate (intersection of diagonal lines of the diffusion plate) are (x = 0.300, y = 0.300), currents of 220 mA, 143 mA, and 110 mA were passed through the red LED, green LED, and blue LED, respectively. The brightness at a position about 1 m away from the diffusion plate surface at the center of the diffusion plate (intersection of the diagonal lines of the diffusion plate) at this time was measured using a spectral radiance meter (spectral type) CS-1000S manufactured by Konica Minolta Holdings, Inc. As a result, it was 3020 cd / m 2 . For color mixing unevenness, the chromaticity coordinates of the red, green, and blue portions on the diffusion plate were measured, and the difference from the center of the diffusion plate was compared and evaluated. The chromaticity coordinate of the most red part was (x = 0.310, y = 0.290), and the difference from the center was (Δx = 0.01, Δy = 0.01). Similarly, the green part is (x = 0.310, y = 0.310), (Δx = 0.01, Δy = 0.01), and the blue part is (x = 0.290, y = 0.290) and (Δx = 0.01, Δy = 0.01).
実施例２：
ツジデン社製拡散フィルム（Ｄ１２３）をツジデン社製拡散フィルム（Ｄ１１４、ヘイズ値８１．４％）に変更した以外は実施例１と同様にしてバックライトを作製した。得られたバックライトについて、実施例１と同様の方法で拡散板中央の輝度を測定したところ３０５３ｃｄ／ｍ2であり、最も赤い部分の色度座標は（ｘ＝０．３１５，ｙ＝０．２９０）であり、中央との差異は（△ｘ＝０．０１５、△ｙ＝０．０１）であった。同様に最も緑の部分は（ｘ＝０．３１０，ｙ＝０．３１５）、（△ｘ＝０．０１、△ｙ＝０．０１５）、最も青の部分は（ｘ＝０．２８５，ｙ＝０．２８５）、（△ｘ＝０．０１５、△ｙ＝０．０１５）であった。
Example 2:
A backlight was produced in the same manner as in Example 1 except that the diffusion film (D123) manufactured by Tsujiden was changed to the diffusion film (D114, haze value 81.4%) manufactured by Tsujiden. With respect to the obtained backlight, the luminance at the center of the diffuser was measured in the same manner as in Example 1. As a result, it was 3053 cd / m 2 , and the chromaticity coordinates of the redmost part were (x = 0.315, y = 0. 290), and the difference from the center was (Δx = 0.015, Δy = 0.01). Similarly, the green part is (x = 0.310, y = 0.315), (Δx = 0.01, Δy = 0.015), and the blue part is (x = 0.285, y = 0.285) and (Δx = 0.015, Δy = 0.015).
比較例１：
筐体にＬＥＤ埋設用の穴を開けず、ＬＥＤを直接筐体底面に設置した以外は実施例１と同様にしてバックライトを作製した。得られたバックライトについて、実施例１と同様の方法で拡散板中央の輝度を測定したところ２８００ｃｄ／ｍ2であり、最も赤い部分の色度座標は（ｘ＝０．３１５，ｙ＝０．２９０）であり、中央との差異は（△ｘ＝０．０１５、△ｙ＝０．０１）であった。同様に最も緑の部分は（ｘ＝０．３１０，ｙ＝０．３１５）、（△ｘ＝０．０１、△ｙ＝０．０１５）、最も青の部分は（ｘ＝０．２８５，ｙ＝０．２８５）、（△ｘ＝０．０１５、△ｙ＝０．０１５）であった。
Comparative Example 1:
A backlight was produced in the same manner as in Example 1 except that the LED was not directly provided on the bottom of the housing without opening the LED-embedding hole. With respect to the obtained backlight, the luminance at the center of the diffuser was measured in the same manner as in Example 1. As a result, it was 2800 cd / m 2 , and the chromaticity coordinates of the redmost part were (x = 0.315, y = 0. 290), and the difference from the center was (Δx = 0.015, Δy = 0.01). Similarly, the green part is (x = 0.310, y = 0.315), (Δx = 0.01, Δy = 0.015), and the blue part is (x = 0.285, y = 0.285) and (Δx = 0.015, Δy = 0.015).
実施例３：
実施例１において用いたアルミニウム筐体内のポリメチルメタクリレート製透明樹脂板、及びその直上のツジデン社製拡散フィルム（Ｄ１２３）の両者を取り除いた以外は実施例１と全く同様の方法で評価を行った。
その結果、拡散板中央の輝度は３４６０ｃｄ／ｍ2であり、最も赤い部分の色度座標は（ｘ＝０．３２０，ｙ＝０．２８０）であり、中央との差異は（△ｘ＝０．０２、△ｙ＝０．０２）であった。同様に最も緑の部分は（ｘ＝０．３３０，ｙ＝０．３５０）、（△ｘ＝０．０３、△ｙ＝０．０５）、最も青の部分は（ｘ＝０．２７５，ｙ＝０．２７５）、（△ｘ＝０．０２５、△ｙ＝０．０２５）であった。
Example 3:
Evaluation was performed in exactly the same manner as in Example 1 except that both the polymethylmethacrylate transparent resin plate in the aluminum casing used in Example 1 and the tsujiden diffusion film (D123) directly above it were removed. .
As a result, the luminance at the center of the diffusion plate is 3460 cd / m 2 , the chromaticity coordinates of the redst part are (x = 0.320, y = 0.280), and the difference from the center is (Δx = 0). 0.02, Δy = 0.02). Similarly, the green part is (x = 0.330, y = 0.350), (Δx = 0.03, Δy = 0.05), and the blue part is (x = 0.275, y = 0.275) and (Δx = 0.025, Δy = 0.025).
実施例４：
ポリメチルメタクリレート製透明樹脂板及び拡散フィルムに代えて、長辺に沿ってＬＥＤランプ間の中央部に、高さ２０ｍｍ、厚さ０．５ｍｍのアルミニウム板による仕切り板を２枚形成した以外は実施例１と同様にしてバックライトを作製した。なお、仕切り板の表面は東レ製白色反射フィルム（ルミラー（登録商標）６０Ｌ）を貼って覆った。その部分平面図を図５に示す。
得られたバックライトについて、実施例１と同様の方法で拡散板中央の輝度を測定したところ、３０２０ｃｄ／ｍ2であった。最も赤い部分の色度座標は（ｘ＝０．３０５，ｙ＝０．２９０）であり、中央との差異は（△ｘ＝０．００５、△ｙ＝０．０１）であった。同様に最も緑の部分は（ｘ＝０．３１０，ｙ＝０．３０５）、（△ｘ＝０．０１、△ｙ＝０．００５）、最も青の部分は（ｘ＝０．２９０，ｙ＝０．３０５）、（△ｘ＝０．０１、△ｙ＝０．００５）であった。
Example 4:
Instead of a polymethylmethacrylate transparent resin plate and a diffusion film, it was carried out except that two partition plates made of an aluminum plate with a height of 20 mm and a thickness of 0.5 mm were formed along the long side between the LED lamps. A backlight was produced in the same manner as in Example 1. The surface of the partition plate was covered with a Toray white reflective film (Lumirror (registered trademark) 60L). A partial plan view thereof is shown in FIG.
With respect to the obtained backlight, the luminance at the center of the diffusion plate was measured by the same method as in Example 1. As a result, it was 3020 cd / m 2 . The chromaticity coordinate of the most red part was (x = 0.305, y = 0.290), and the difference from the center was (Δx = 0.005, Δy = 0.01). Similarly, the green part is (x = 0.310, y = 0.305), (Δx = 0.01, Δy = 0.005), and the blue part is (x = 0.290, y = 0.305) and (Δx = 0.01, Δy = 0.005).
実施例５：
４０×４０ｍｍの０．８ｍｍ厚のアルミニウム基材上にＬＥＤを図６及び図７に示す配置で設置し、これを単位光源Ａ、Ｂとした。ここで、１１は赤色ＬＥＤ、１２は緑色ＬＥＤ、１３は青色ＬＥＤである。単位光源を構成する隣接ＬＥＤの中心間隔は各々１４ｍｍとした。実施例１と同様の筐体を用い、ＬＥＤの位置に穴を開け、この単位光源を筐体の裏側からＬＥＤのレンズ部のみが突出するように、長辺に沿って５枚、短辺に沿って３枚、合計１５枚設置した。ここで、長辺方向に隣接する単位光源（アルミニウム基材）の間隔は１６ｍｍ、短辺方向に隣接する単位光源（アルミニウム基材）の間隔は３８ｍｍとした。なお、短辺の壁際に位置する箇所のみ単位光源はＢとし、その他の単位光源はＡ、すなわち、図８のような配置とした。その他は、実施例１と同様にしてバックライトを作製した。得られたバックライトについて、実施例１と同様の方法で拡散板中央の輝度を測定したところ３０２３ｃｄ／ｍ2であり、最も赤い部分の色度座標は（ｘ＝０．３１５，ｙ＝０．２９０）であり、中央との差異は（△ｘ＝０．０１５、△ｙ＝０．０１）であった。同様に、最も緑の部分は（ｘ＝０．３１０，ｙ＝０．３１５）、（△ｘ＝０．０１、△ｙ＝０．０１５）、最も青の部分は（ｘ＝０．２８５，ｙ＝０．２８５）、（△ｘ＝０．０１５、△ｙ＝０．０１５）であった。
Example 5:
The LEDs were placed in a layout shown in FIGS. 6 and 7 on a 40 × 40 mm 0.8 mm-thick aluminum base material and used as unit light sources A and B. Here, 11 is a red LED, 12 is a green LED, and 13 is a blue LED. The distance between the centers of adjacent LEDs constituting the unit light source was 14 mm. Using the same housing as in Example 1, a hole is made in the position of the LED, and this unit light source is 5 pieces along the long side and the short side so that only the lens portion of the LED protrudes from the back side of the housing. A total of 15 sheets were installed along the 3 sheets. Here, the interval between unit light sources (aluminum substrate) adjacent in the long side direction was 16 mm, and the interval between unit light sources (aluminum substrate) adjacent in the short side direction was 38 mm. It should be noted that the unit light source is set to B only at a position located near the short side wall, and the other unit light sources are set to A, that is, as shown in FIG. Otherwise, a backlight was produced in the same manner as in Example 1. With respect to the obtained backlight, the luminance at the center of the diffuser was measured in the same manner as in Example 1. As a result, it was 3023 cd / m 2 , and the chromaticity coordinates of the redmost part were (x = 0.315, y = 0. 290), and the difference from the center was (Δx = 0.015, Δy = 0.01). Similarly, the green part is (x = 0.310, y = 0.315), (Δx = 0.01, Δy = 0.015), and the blue part is (x = 0.285, y = 0.285) and (Δx = 0.015, Δy = 0.015).
実施例６：
単位光源をすべてＡとした以外は、実施例５と同様にしてバックライトユニットを作製した。得られたバックライトについて、実施例１と同様の方法で拡散板中央の輝度を測定したところ３０３０ｃｄ／ｍ2であり、最も赤い部分の色度座標は（ｘ＝０．３２０，ｙ＝０．２８）であり、中央との差異は（△ｘ＝０．０２、△ｙ＝０．０２）であった。同様に最も緑の部分は（ｘ＝０．３３０，ｙ＝０．３５０）、（△ｘ＝０．０３、△ｙ＝０．０５）、最も青の部分は（ｘ＝０．２７５，ｙ＝０．２７５）、（△ｘ＝０．０２５、△ｙ＝０．０２５）であり、実施例５より色むらが若干劣っていた。
Example 6:
A backlight unit was produced in the same manner as in Example 5 except that the unit light sources were all A. With respect to the obtained backlight, the luminance at the center of the diffuser was measured in the same manner as in Example 1. As a result, it was 3030 cd / m 2 , and the chromaticity coordinates of the most red part were (x = 0.320, y = 0. 28), and the difference from the center was (Δx = 0.02, Δy = 0.02). Similarly, the green part is (x = 0.330, y = 0.350), (Δx = 0.03, Δy = 0.05), and the blue part is (x = 0.275, y = 0.275) and (Δx = 0.025, Δy = 0.025), and the color unevenness was slightly inferior to that of Example 5.
１ 基材
２ 筺体
３ 反射シート
４ 発光ダイオード（ＬＥＤ）
４ａ 発光ダイオード（ＬＥＤ）レンズ部
４ｂ 発光ダイオード（ＬＥＤ）パッケージ部
４ｃ 発光ダイオード（ＬＥＤ）端子
５ 拡散部材
６ 第２拡散部材
７ 仕切り部材
１１ 赤色ＬＥＤ
１２ 緑色ＬＥＤ
１３ 青色ＬＥＤ
DESCRIPTION OF
4a Light emitting diode (LED)
12 Green LED
13 Blue LED
Claims (10)
前記単位光源中、前記青色発光ダイオードは単位光源の中心に配置されており、
隣り合う前記単位光源間のいずれかには仕切り部材が設けられ、
前記発光ダイオードはレンズ部とパッケージ部を有し、基板に配置されており、かつ前記発光ダイオードのパッケージ部の一部または全部が前記基板に埋設されているバックライト。 A backlight having a plurality of unit light sources, each of which has a total of 5 light-emitting diodes of 2 red, 1 blue, and 2 green,
In the unit light source, the blue light emitting diode is disposed at the center of the unit light source,
A partition member is provided between any of the adjacent unit light sources,
The light emitting diode has a lens portion and a package portion, is disposed on a substrate, and a part or all of the package portion of the light emitting diode is embedded in the substrate .
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006236394A JP5030204B2 (en) | 2005-09-01 | 2006-08-31 | Light emitting diode light source, backlight and liquid crystal display |
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| JP2005253923 | 2005-09-01 | ||
| JP2005253923 | 2005-09-01 | ||
| JP2006236394A JP5030204B2 (en) | 2005-09-01 | 2006-08-31 | Light emitting diode light source, backlight and liquid crystal display |
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| JP2007096290A JP2007096290A (en) | 2007-04-12 |
| JP5030204B2 true JP5030204B2 (en) | 2012-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| JP2006236394A Expired - Fee Related JP5030204B2 (en) | 2005-09-01 | 2006-08-31 | Light emitting diode light source, backlight and liquid crystal display |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009181883A (en) * | 2008-01-31 | 2009-08-13 | Harison Toshiba Lighting Corp | Backlight device |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0566722A (en) * | 1991-09-07 | 1993-03-19 | Rohm Co Ltd | Light emitting diode display device and display panel |
| JPH0830213A (en) * | 1994-07-18 | 1996-02-02 | Rohm Co Ltd | Light emitting diode display device |
| JPH0936436A (en) * | 1995-07-20 | 1997-02-07 | Kokusai Electric Co Ltd | Light emitting diode |
| JP3292133B2 (en) * | 1997-04-14 | 2002-06-17 | 日亜化学工業株式会社 | LED display and display device using the same |
| JP2002368290A (en) * | 2001-06-13 | 2002-12-20 | Okaya Electric Ind Co Ltd | Led display |
| JP3927011B2 (en) * | 2001-08-20 | 2007-06-06 | 株式会社 日立ディスプレイズ | Liquid crystal display device and its driving circuit |
| JP2004012924A (en) * | 2002-06-07 | 2004-01-15 | Sumitomo Rubber Ind Ltd | Light emitting device |
| JP4413672B2 (en) * | 2003-03-31 | 2010-02-10 | シャープ株式会社 | Surface illumination device and liquid crystal display device using the same |
| JP2005117023A (en) * | 2003-09-19 | 2005-04-28 | Sony Corp | Backlight apparatus and liquid crystal display device |
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2006
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| JP2007096290A (en) | 2007-04-12 |
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