JP4708440B2 - Surface light source device - Google Patents

Surface light source device Download PDF

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JP4708440B2
JP4708440B2 JP2008004274A JP2008004274A JP4708440B2 JP 4708440 B2 JP4708440 B2 JP 4708440B2 JP 2008004274 A JP2008004274 A JP 2008004274A JP 2008004274 A JP2008004274 A JP 2008004274A JP 4708440 B2 JP4708440 B2 JP 4708440B2
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light
guide plate
light source
source device
distribution
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JP2008098190A (en
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俊之 米田
博志 満田
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Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
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Mitsubishi Electric Corp
Mitsubishi Electric Lighting Corp
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この発明は、入光面およびこの入光面とほぼ直交して形成された出射面を有する導光板と、前記入光面に対向して設けられているとともに配光分布に異方性を有する複数の光源とを備えた面光源装置に関するものである。   The present invention provides a light guide plate having a light incident surface and an output surface formed substantially orthogonal to the light incident surface, and is provided to face the light incident surface and has anisotropy in the light distribution. The present invention relates to a surface light source device including a plurality of light sources.

従来、面光源装置として、発光ダイオードである複数のＬＥＤから発せられた光が導光板の入光面から入射し、入射した光は、導光板内部を全反射しながら伝播し、この伝播途中で導光板の表裏面に設けられたドットパターンにより散乱された後、導光板の面から出射し、その出射光が表示板の裏面より照射して、表示板上の図柄を表示するものが提案されている（特許文献１参照）。   Conventionally, as a surface light source device, light emitted from a plurality of LEDs, which are light emitting diodes, is incident from the light incident surface of the light guide plate, and the incident light propagates while totally reflecting inside the light guide plate. After being scattered by the dot pattern provided on the front and back surfaces of the light guide plate, it is emitted from the surface of the light guide plate, and the emitted light is irradiated from the back surface of the display plate to display the design on the display plate. (See Patent Document 1).

特開平８−１６０８９２号公報Japanese Patent Application Laid-Open No. 8-160892

このように構成された従来の面光源装置では、複数のＬＥＤが同一方向に配置されているので、表示板に照射される配光分布はＬＥＤ自体の配光分布に依存することになり、必要とする配光分布に対して必ずしも対応することができず、そのためには、それ用の配光分布を有するＬＥＤが必要となり、高価格化を招くという問題点があった。   In the conventional surface light source device configured in this way, since a plurality of LEDs are arranged in the same direction, the light distribution distributed to the display panel depends on the light distribution of the LEDs themselves, which is necessary. However, it is not always possible to cope with the distribution of light distribution, and for that purpose, an LED having the distribution of light distribution for that purpose is required, and there is a problem that the price increases.

この発明は、上記のような問題点を解決することを課題とするものであって、表示板に所望の配光分布の光を照射することができる面光源装置を得ることを目的とする。   SUMMARY OF THE INVENTION An object of the present invention is to provide a surface light source device capable of irradiating light with a desired light distribution on a display panel.

この発明に係る面光源装置は、光が入射する入光面およびこの入光面とほぼ直交して形成され入光面からの光を出射する出射面を有する導光板と、前記入光面に対向して設けられているとともに配光分布に異方性を有する複数の光源とを備えた面光源装置であって、
少なくとも一つの前記光源は、他の光源に対し９０度配置方向が変えられており、前記出射面に対して平行な面の前記光の広がりが他の光源と異なるようになっているとともに、複数の前記光源の光の配光分布は、前記入光面の垂直方向を軸にして前記出射面に平行な面内において対称である。 A surface light source device according to the present invention includes a light guide plate having a light incident surface on which light is incident and an output surface that is formed substantially orthogonal to the light incident surface and emits light from the light incident surface; A surface light source device provided with a plurality of light sources provided opposite to each other and having anisotropy in a light distribution,
At least one of the light source, 90 degrees orientation relative to the other light source has been changed, together with said light spread of a plane parallel to the exit surface is adapted to differ from the other light source, a plurality The light distribution of the light from the light source is symmetric in a plane parallel to the emission surface with the vertical direction of the light incident surface as an axis .

この発明による面光源装置によれば、表示板に所望の配光分布の光を照射することができる。   According to the surface light source device of the present invention, the display plate can be irradiated with light having a desired light distribution.

実施の形態１．
図１はこの発明の実施の形態１による面光源装置１の分解斜視図、図２は図１のＬＥＤ２０の配置図、図３は図１のＬＥＤ２０の配光分布図、図４は面光源装置１の光路を説明するための図である。
この面光源装置１は、入光面１１、出射面１２および反出射面１３を有する導光板１０と、この入光面１１に対向した発光ダイオード２０（以下、ＬＥＤと略称する）と、このＬＥＤ２０が取り付けられたＬＥＤ基板３０と、このＬＥＤ基板３０を囲った断面コ字状のリフレクタ４０と、出射面１２に当接した光学シート５０と、反出射面１３に当接した反射シート６０とを備えている。 Embodiment 1 FIG.
1 is an exploded perspective view of a surface light source device 1 according to Embodiment 1 of the present invention, FIG. 2 is a layout diagram of LEDs 20 in FIG. 1, FIG. 3 is a light distribution diagram of LEDs 20 in FIG. It is a figure for demonstrating 1 optical path.
The surface light source device 1 includes a light guide plate 10 having a light incident surface 11, an output surface 12, and a counter light exit surface 13, a light emitting diode 20 (hereinafter abbreviated as LED) facing the light incident surface 11, and the LED 20. Are mounted on the LED substrate 30, the reflector 40 having a U-shaped cross section surrounding the LED substrate 30, the optical sheet 50 in contact with the emission surface 12, and the reflection sheet 60 in contact with the non-emission surface 13. I have.

導光板１０は、透明なアクリル樹脂で構成されており、出射面１２には光を散乱する拡散部が形成されている。この拡散部はドットパターンで構成されている。なお、導光板１０は、透明なポリカーボネイト樹脂でもよい。また、拡散部はランダムな粗面あるいは微小な球面等で構成してもよい。
ＬＥＤ基板３０上のＬＥＤ２０は、図２に示すように、隣接したＬＥＤ２０同士で略９０°異なる配置方向で固定されている。
リフレクタ４０は、ＬＥＤ２０から発せられた光を効率よく導光板１０に入射させるため、銀色または白色で反射率の高い材料で構成されている。具体的には反射率が７０％以上、より好ましくは９０％以上の材料を用いることが望ましい。
光学シート５０は、導光板１０の出射面１２に対向する面に少なくとも一方向のプリズム列５１を有し、そのプリズム列５１の稜線方向は導光板１０の入光面１１と略平行である。
反射シート６０は導光板１０の反出射面１３から出射した光を効率よく導光板１０に再入射させるため、銀色または白色で反射率の高い材料で構成されている。具体的には反射率が７０％以上、より好ましくは９０％以上の材料を用いることが望ましい。 The light guide plate 10 is made of a transparent acrylic resin, and a light diffusing portion is formed on the emission surface 12. This diffusing portion is composed of a dot pattern. The light guide plate 10 may be a transparent polycarbonate resin. Further, the diffusing portion may be composed of a random rough surface or a minute spherical surface.
As shown in FIG. 2, the LEDs 20 on the LED substrate 30 are fixed in an arrangement direction that differs by approximately 90 ° between adjacent LEDs 20.
The reflector 40 is made of a silver or white material having a high reflectivity so that light emitted from the LED 20 is efficiently incident on the light guide plate 10. Specifically, it is desirable to use a material having a reflectance of 70% or more, more preferably 90% or more.
The optical sheet 50 has at least one prism row 51 on the surface of the light guide plate 10 facing the emission surface 12, and the ridge line direction of the prism row 51 is substantially parallel to the light incident surface 11 of the light guide plate 10.
The reflection sheet 60 is made of a silver or white material having a high reflectivity so that the light emitted from the light-exiting surface 13 of the light guide plate 10 is efficiently incident on the light guide plate 10 again. Specifically, it is desirable to use a material having a reflectance of 70% or more, more preferably 90% or more.

ＬＥＤ２０は図３に示すように配光分布特性を有している。蒲鉾形状のＬＥＤ２０は、ｘ−ｙ平面上と、ｙ−ｚ平面上とでは配光分布が異なる。この図から明らかなように、ｘ−ｙ平面上では、ｙ軸上の原点を基点として＋６０°および−６０°を越えると光度が極端に低くなる。また、ｙ−ｚ平面上では、ｙ軸上の原点を基点として＋３０°および−３０°を越えると光度が極端に低くなる。このＬＥＤ２０としては、例えば日亜化学工業株式会社製ＮＳＳＸ４４０シリーズ等が用いられる。   The LED 20 has a light distribution characteristic as shown in FIG. The light-emitting distribution of the bowl-shaped LED 20 is different between the xy plane and the yz plane. As is clear from this figure, on the xy plane, the light intensity becomes extremely low when it exceeds + 60 ° and −60 ° with the origin on the y-axis as the base point. On the yz plane, when the origin on the y-axis is the base point and exceeds + 30 ° and −30 °, the light intensity becomes extremely low. For example, NSSX440 series manufactured by Nichia Corporation is used as the LED 20.

次に、上記構成の面光源装置１の動作について、図４を用いて説明する。
ＬＥＤ２０から発せられた光線８０は、直接、またはＬＥＤ基板３０、リフレクタ４０で反射して導光板１０の入光面１１から導光板１０に入射する。入射した光は、導光板１０の内部を全反射されながら伝播していく。この伝播途中で、出射面１２に設けられた拡散部により散乱された光は出射面１２から出射する。なお、一部の光は、導光板１０の反出射面１３より出射するが、反射シート６０により導光板１０に戻された後、出射面１２から出射する。導光板１０の出射面１２より出射した光Ａは、光学シート５０のプリズム列５１を構成する一面から入射し、隣り合う面で全反射し、光学シート５０の上面から出射する。 Next, the operation of the surface light source device 1 configured as described above will be described with reference to FIG.
The light beam 80 emitted from the LED 20 is incident on the light guide plate 10 directly or after being reflected by the LED substrate 30 and the reflector 40 from the light incident surface 11 of the light guide plate 10. The incident light propagates while being totally reflected inside the light guide plate 10. During this propagation, the light scattered by the diffusion portion provided on the emission surface 12 is emitted from the emission surface 12. A part of the light is emitted from the opposite exit surface 13 of the light guide plate 10, but is emitted from the exit surface 12 after being returned to the light guide plate 10 by the reflection sheet 60. The light A emitted from the emission surface 12 of the light guide plate 10 is incident from one surface constituting the prism row 51 of the optical sheet 50, totally reflected by the adjacent surfaces, and emitted from the upper surface of the optical sheet 50.

このように、この実施の形態では、光学シート５０により導光板１０の入光面１１および出射面１２に対して垂直な平面（図１におけるｙ−ｚ平面）において、出射面１２に対して斜め方向の光（図４においてＡ）を、プリズム列５１により出射面１２に対して垂直方向に偏向させて出射することができ、導光板１０の入光面１１および出射面１２に対して垂直な平面（図１におけるｙ−ｚ平面）において任意の配光分布を有する面光源装置を得ることができる。   As described above, in this embodiment, the optical sheet 50 is inclined with respect to the emission surface 12 in a plane perpendicular to the light incident surface 11 and the emission surface 12 of the light guide plate 10 (the yz plane in FIG. 1). Direction light (A in FIG. 4) can be emitted by being deflected in a direction perpendicular to the emission surface 12 by the prism row 51 and is perpendicular to the light incident surface 11 and the emission surface 12 of the light guide plate 10. A surface light source device having an arbitrary light distribution in the plane (the yz plane in FIG. 1) can be obtained.

また、導光板１０からの出射光の入光面１１と平行な平面(図１におけるｘ−ｙ平面)における広がりは、導光板１０を伝播する光の出射面１２と平行な平面(図１におけるｘ−ｚ平面)における広がり、即ちＬＥＤ２０の出射光の出射面１２と平行な平面の広がりに依存する。
この実施の形態では、配光分布に対して異方性を持つ汎用的なＬＥＤ２０を一つおきに９０°配置方向を変えることで、導光板１０の入光面１１と平行な平面(図１におけるｘ−ｙ平面)においても、配光分布を調整している。 Further, the spread of the light emitted from the light guide plate 10 in a plane parallel to the light incident surface 11 (xy plane in FIG. 1) is a plane parallel to the light output surface 12 propagating through the light guide plate 10 (in FIG. 1). xz plane), that is, the spread of the plane parallel to the emission surface 12 of the emitted light of the LED 20.
In this embodiment, a plane parallel to the light incident surface 11 of the light guide plate 10 is changed by changing the direction of arrangement of every other general-purpose LED 20 having anisotropy with respect to the light distribution (90 °) (FIG. 1). The light distribution is also adjusted in the xy plane).

なお、プリズム列５１の稜線方向を導光板１０の入光面１１に対して垂直にすることで、導光板１０の入光面１１に対して平行で出射面１２に対して垂直な平面（図１におけるｘ−ｙ平面）において任意の配光分布を有する面光源装置を得ることも可能である。   In addition, by making the ridge line direction of the prism row 51 perpendicular to the light incident surface 11 of the light guide plate 10, a plane parallel to the light incident surface 11 of the light guide plate 10 and perpendicular to the light emission surface 12 (see FIG. It is also possible to obtain a surface light source device having an arbitrary light distribution in the xy plane in FIG.

参考例１．
図５はこの発明の参考例１による表示装置の分解斜視図、図６（ａ）は図５の導光板１５の入光面近傍の拡大平面図、図７は図５の表示板７０とＬＥＤ２０との関係を示す図、図８は図５のＬＥＤ２０の配置図である。
この表示装置は、面光源装置１の光学シート５０に表示板７０が重ねられて構成されている。
導光板１５の入光面１６には稜線方向が厚さ方向であるプリズム列５２が形成されている。表示板７０は、透明なアクリル樹脂で構成されており、面光源装置１に対向する面(以後、背面と呼ぶ)あるいは面光源装置１から遠い側の面(以後、前面と呼ぶ)の一方にスクリーン印刷やカッティングシート等により図柄が設けられている。なお、両面に図柄を設けるようにしてもよい。また、表示板は、ポリカーボネイト樹脂や透明なガラスまたは拡散透過板であってもよい。
この例では、表示板７０では避難口誘導灯に用いられる図柄であり、斜線部には緑色の印刷が施されている。 Reference Example 1
5 is an exploded perspective view of the display device according to the first embodiment of the present invention, FIG. 6A is an enlarged plan view of the vicinity of the light incident surface of the light guide plate 15 in FIG. 5, and FIG. 7 is the display plate 70 and the LED 20 in FIG. FIG. 8 is a layout diagram of the LEDs 20 in FIG.
This display device is configured by superimposing a display plate 70 on the optical sheet 50 of the surface light source device 1.
On the light incident surface 16 of the light guide plate 15, a prism row 52 whose ridge line direction is the thickness direction is formed. The display board 70 is made of a transparent acrylic resin and is provided on one of a surface facing the surface light source device 1 (hereinafter referred to as a back surface) or a surface far from the surface light source device 1 (hereinafter referred to as a front surface). The pattern is provided by screen printing or cutting sheet. In addition, you may make it provide a pattern in both surfaces. Further, the display board may be a polycarbonate resin, transparent glass, or a diffuse transmission board.
In this example, the display board 70 is a symbol used for an escape exit guide light, and the hatched portion is printed in green.

次に、上記構成の表示装置の動作について説明する。
ＬＥＤ２０から発せられた光線８０は、直接、またはＬＥＤ基板３０、リフレクタ４０で反射して導光板１５の入光面１６から導光板１５に入射する。この際、入光面１６にはプリズム列５２が設けられているため、導光板１５中を伝播する光の出射面１７に平行な面の広がりは、同図（ｂ）に示す入光面１６が鏡面の場合に比べ広くなる。
入光後の導光板１５中の伝播および光学シート５０の動作は実施の形態１に示したものと同一であり、その説明は省略する。 Next, the operation of the display device having the above configuration will be described.
The light beam 80 emitted from the LED 20 is incident on the light guide plate 15 directly or after being reflected by the LED substrate 30 and the reflector 40 from the light incident surface 16 of the light guide plate 15. At this time, since the prism array 52 is provided on the light incident surface 16, the spread of the surface parallel to the light emission surface 17 of the light propagating through the light guide plate 15 is the light incident surface 16 shown in FIG. Is wider than that of a mirror surface.
The propagation in the light guide plate 15 and the operation of the optical sheet 50 after entering light are the same as those shown in the first embodiment, and the description thereof is omitted.

この例では、面光源装置１を出射した光は表示板７０を背面から照らし、表示板７０の前面に位置する観察者に表示板７０の情報を伝える。
ここで、図７に示すように表示板７０を導光板１５の入光面１６に垂直な破線９０でＡ、Ｂ、Ｃの３つの領域部に分割すると、領域部Ｂの透過率が領域部Ａ、Ｃの透過率に比べて高い。
ＬＥＤ２０は、図３に示すように、ｘ−ｙ平面およびｙ−ｚ平面において配光分布が異なる異方性を持ち、図８に示すように領域部Ａ、Ｃの延長上と領域部Ｂの延長上でＬＥＤ２０の配置方向が異なり、領域部Ａ、Ｃの延長上に位置するＬＥＤ２０の配光分布が、領域部Ｂの延長上に位置するＬＥＤ２０の配光分布に比べ、表示板７０にほぼ平行な面(即ち、図５におけるｘ−ｚ平面)の広がりが大きくなる配置方向としている。このため、領域部Ａ、Ｃの延長上に位置するＬＥＤ２０からの光は、広がりが大きく、透過率の高い領域Ｂにも達し、広い配光分布で表示板７０から出射する。
一方、領域部Ｂの延長上に位置するＬＥＤ２０からの光は広がりを制限され、効率よく透過率の高い領域部Ｂから、正面方向に整った配光分布で出射する。 In this example, the light emitted from the surface light source device 1 illuminates the display board 70 from the back, and transmits information on the display board 70 to an observer located in front of the display board 70.
Here, as shown in FIG. 7, when the display plate 70 is divided into three region portions A, B, and C by a broken line 90 perpendicular to the light incident surface 16 of the light guide plate 15, the transmittance of the region portion B becomes the region portion. Higher than the transmittance of A and C.
As shown in FIG. 3, the LED 20 has anisotropy with different light distributions in the xy plane and the yz plane, and as shown in FIG. The arrangement direction of the LEDs 20 is different on the extension, and the light distribution distribution of the LEDs 20 positioned on the extension of the area portions A and C is almost equal to the light distribution distribution of the LED 20 positioned on the extension of the area portion B. The arrangement direction is such that the spread of parallel planes (that is, the xz plane in FIG. 5) increases. For this reason, the light from the LED 20 positioned on the extension of the area portions A and C reaches the area B having a large spread and high transmittance, and is emitted from the display panel 70 with a wide light distribution.
On the other hand, the light from the LED 20 located on the extension of the region B is limited in its spread, and is efficiently emitted from the region B having a high transmittance with a light distribution that is arranged in the front direction.

この表示装置によって得られる導光板１５の入光面１６に平行な平面(即ち、図５におけるｘ−ｚ平面)における配光分布を図９中実線で示す。
図９におけるθは正面（すなわち図５におけるｙ軸）からの角度である。
なお、比較例として図１０（ａ）に示すＬＥＤ２０の配置のときの配光分布を図中細線、図１０（ｂ）に示すＬＥＤ２０の配置のときの配光分布を図中点線、および（社）日本照明器具工業会規格（略称ＪIL規格）によって定められた避難口誘導灯の配光分布を図中一点鎖線で示す。
図９から明らかなように、図８に示すようにＬＥＤ２０を配置することにより、正面(θ＝０[度])での輝度が高く、かつ配光分布が広く視認性の良い、避難口誘導灯に適した表示装置を得ることができる。 The light distribution in a plane parallel to the light incident surface 16 of the light guide plate 15 obtained by this display device (that is, the xz plane in FIG. 5) is indicated by a solid line in FIG.
9 is an angle from the front (that is, the y-axis in FIG. 5).
As a comparative example, the light distribution in the arrangement of the LED 20 shown in FIG. 10A is a thin line in the drawing, the light distribution in the arrangement of the LED 20 shown in FIG. 10B is a dotted line in the drawing, and ) The light distribution of the evacuation exit guide light determined by the Japan Lighting Equipment Manufacturers Association standard (abbreviated as JIL standard) is indicated by a one-dot chain line in the figure.
As can be seen from FIG. 9, by arranging the LEDs 20 as shown in FIG. 8, the exit guidance is high in brightness in the front (θ = 0 [degree]), wide light distribution and good visibility. A display device suitable for a lamp can be obtained.

なお、実施の形態１及び参考例１ではＬＥＤ２０を一列に配置した面光源装置１について説明したが、ＬＥＤ２０の配置位置、個数はこれに限定されるものではなく、例えばＬＥＤを複数列に配置してもよい。
また、導光板１０の出射面１２に拡散部を形成しているが、これに限定されるものではなく、反出射面１３、または出射面１２と反出射面１３の両面に拡散部を形成してもよい。
また、光学シート５０に導光板１０、１５の出射面１２、１７に対向する面に一方向のプリズム列５１を有し、そのプリズム列５１の稜線方向は導光板１０、１５の入光面１１、１６と略平行なものを用いたが、光学シート５０はこれに限定されるものではなく、導光板から遠い側の面にプリズム列を持つシートや拡散シート、さらには複数の光学シートを組み合わせて用いてもよい。
また、光源として配光分布に異方性を有するＬＥＤについて説明したが、勿論このものに限定されるものではなく、例えばレーザダイオードであってもよい。
また、参考例１においては、表示板７０として避難口誘導灯に用いられる図柄を印刷した表示板７０を用いたが、無論これに限定されるものではなく、他の図柄の表示板や図柄の変更が可能な液晶パネル等を用いてもよい。 Although the surface light source device 1 in which the LEDs 20 are arranged in a row has been described in the first embodiment and the reference example 1, the arrangement position and the number of the LEDs 20 are not limited to this, and for example, the LEDs are arranged in a plurality of rows. May be.
Moreover, although the diffusion part is formed in the output surface 12 of the light-guide plate 10, it is not limited to this, The diffusion part is formed in both surfaces of the anti-output surface 13 or the output surface 12 and the anti-output surface 13 May be.
The optical sheet 50 has a unidirectional prism row 51 on the surface facing the light emission surfaces 12 and 17 of the light guide plates 10 and 15, and the ridge line direction of the prism row 51 is the light incident surface 11 of the light guide plates 10 and 15. , 16 is used, but the optical sheet 50 is not limited to this, and a sheet or a diffusion sheet having a prism row on the surface far from the light guide plate, or a combination of a plurality of optical sheets. May be used.
Moreover, although LED which has anisotropy in light distribution as a light source was demonstrated, of course, it is not limited to this, For example, a laser diode may be sufficient.
In Reference Example 1, the display board 70 printed with the design used for the escape exit guide light is used as the display board 70. However, the display board 70 is not limited to this and is not limited to this. A changeable liquid crystal panel or the like may be used.

以上説明したように、この発明に係る面光源装置によれば、光が入射する入光面およびこの入光面とほぼ直交して形成され入光面からの光を出射する出射面を有する導光板と、前記入光面に対向して設けられているとともに配光分布に異方性を有する複数の光源とを備えたものであって、少なくとも一つの前記光源は、他の光源と配置方向が９０度異なって配置され、前記出射面に対して平行な面の前記光の広がりが他の光源と異なるようになっているので、所望の配光分布を簡単に実現することができる。   As described above, according to the surface light source device of the present invention, a light guide surface having a light incident surface on which light is incident and a light exit surface that is formed substantially orthogonal to the light incident surface and emits light from the light incident surface. An optical plate and a plurality of light sources provided opposite to the light incident surface and having anisotropy in a light distribution, wherein at least one of the light sources is arranged with another light source. Are arranged 90 degrees different from each other, and the spread of the light in a plane parallel to the emission surface is different from that of other light sources, so that a desired light distribution can be easily realized.

また、この表示装置によれば、表示板は、導光板の入光面の法線と平行な境界線で複数に分割された領域部を有しており、前記領域部のうち他の領域部と比較して透過率の低い領域部に対応した光源の配光分布が、透過率の高い領域部に対応した光源の配光分布と比較して、前記導光板の出射面に対して平行な面の広がりが大きくなるように、前記光源の配置方向が定められているので、正面輝度が高く、かつ配光分布が広く視認性の高い表示装置を得ることができる。   Further, according to this display device, the display plate has a region portion divided into a plurality of boundaries by a boundary line parallel to the normal line of the light incident surface of the light guide plate, and the other region portion among the region portions. Compared with the light distribution of the light source corresponding to the region part with high transmittance, the light distribution distribution of the light source corresponding to the region part with low transmittance is parallel to the exit surface of the light guide plate. Since the arrangement direction of the light sources is determined so that the spread of the surface becomes large, a display device with high front luminance, wide light distribution, and high visibility can be obtained.

実施の形態１における面光源装置の分解斜視図である。2 is an exploded perspective view of the surface light source device in Embodiment 1. FIG. 図１のＬＥＤの配置図である。FIG. 2 is a layout diagram of LEDs in FIG. 1. 図１のＬＥＤの配光分布を示す図である。It is a figure which shows the light distribution of LED of FIG. 図１の面光源装置の光路を説明するための図である。It is a figure for demonstrating the optical path of the surface light source device of FIG. 参考例１における表示装置の分解斜視図である。10 is an exploded perspective view of a display device in Reference Example 1. FIG. （ａ）は図５の要部平面図、（ｂ）は（ａ）と異なる例を示す平面図である。(A) is a principal part top view of FIG. 5, (b) is a top view which shows the example different from (a). 図５の表示板とＬＥＤとの関係を示す図である。It is a figure which shows the relationship between the display board of FIG. 5, and LED. 図５のＬＥＤの配置図である。FIG. 6 is a layout view of LEDs in FIG. 5. 参考例１における表示装置の配光分布を示す図である。It is a figure which shows the light distribution of the display apparatus in the reference example 1. FIG. （ａ）、（ｂ）は図９の比較例におけるそれぞれのＬＥＤの配置図である。(A), (b) is the arrangement | positioning drawing of each LED in the comparative example of FIG.

符号の説明Explanation of symbols

１ 面光源装置、１０，１５ 導光板、１１，１６ 入光面、１２，１７ 出射面、２０ ＬＥＤ（光源）、３０ ＬＥＤ基板、５０ 光学シート、５１，５２ プリズム列、７０ 表示板。   DESCRIPTION OF SYMBOLS 1 Surface light source device, 10, 15 Light guide plate, 11, 16 Light-incidence surface, 12, 17 Output surface, 20 LED (light source), 30 LED board, 50 Optical sheet, 51,52 Prism row | line | column, 70 Display board.

Claims (2)

光が入射する入光面およびこの入光面とほぼ直交して形成され入光面からの光を出射する出射面を有する導光板と、前記入光面に対向して設けられているとともに配光分布に異方性を有する複数の光源とを備えた面光源装置であって、
少なくとも一つの前記光源は、他の光源に対し９０度配置方向が変えられており、前記出射面に対して平行な面の前記光の広がりが他の光源と異なるようになっているとともに、複数の前記光源の光の配光分布は、前記入光面の垂直方向を軸にして前記出射面に平行な面内において対称であることを特徴とする面光源装置。 A light guide plate having a light incident surface on which light is incident and a light exit surface that is formed substantially orthogonal to the light incident surface and emits light from the light incident surface; A surface light source device comprising a plurality of light sources having anisotropy in light distribution,
At least one of the light source, 90 degrees orientation relative to the other light source has been changed, together with said light spread of a plane parallel to the exit surface is adapted to differ from the other light source, a plurality The surface light source device is characterized in that the light distribution of light from the light source is symmetric in a plane parallel to the exit surface with the vertical direction of the light incident surface as an axis . 複数の前記光源は、前記導光板の前記入光面に対向して列をなして配置され、かつ両側の光源は、同一の配置方向に配置されていることを特徴とする請求項１に記載の面光源装置。 The plurality of light sources are arranged in a row so as to face the light incident surface of the light guide plate, and the light sources on both sides are arranged in the same arrangement direction. Surface light source device.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104412032A (en) * 2012-07-04 2015-03-11 夏普株式会社 Edge-light type planar light source device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010055842A (en) 2008-08-26 2010-03-11 Panasonic Electric Works Co Ltd Illumination device
WO2012147646A1 (en) * 2011-04-28 2012-11-01 シャープ株式会社 Light source device, surface light source device, display device, and illumination device
JP2015090959A (en) * 2013-11-07 2015-05-11 ソニー株式会社 Light-emitting device and display device
KR102333790B1 (en) * 2015-01-23 2021-12-01 삼성디스플레이 주식회사 Curved display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11265610A (en) * 1998-03-17 1999-09-28 Enplas Corp Light emitting diode, sidelight type surface light source device and liquid crystal displace device
JP2003029248A (en) * 2001-07-13 2003-01-29 Fujitsu Ten Ltd Liquid crystal display device
JP2003029045A (en) * 2001-07-19 2003-01-29 Mitsubishi Rayon Co Ltd Surface light source unit and light transmitting plate used therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11265610A (en) * 1998-03-17 1999-09-28 Enplas Corp Light emitting diode, sidelight type surface light source device and liquid crystal displace device
JP2003029248A (en) * 2001-07-13 2003-01-29 Fujitsu Ten Ltd Liquid crystal display device
JP2003029045A (en) * 2001-07-19 2003-01-29 Mitsubishi Rayon Co Ltd Surface light source unit and light transmitting plate used therefor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104412032A (en) * 2012-07-04 2015-03-11 夏普株式会社 Edge-light type planar light source device
CN104412032B (en) * 2012-07-04 2016-06-08 夏普株式会社 Edge light type planar light source device

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