JPH0962197A - Surface light source element - Google Patents
Surface light source elementInfo
- Publication number
- JPH0962197A JPH0962197A JP7220870A JP22087095A JPH0962197A JP H0962197 A JPH0962197 A JP H0962197A JP 7220870 A JP7220870 A JP 7220870A JP 22087095 A JP22087095 A JP 22087095A JP H0962197 A JPH0962197 A JP H0962197A
- Authority
- JP
- Japan
- Prior art keywords
- light
- light source
- source element
- present
- distribution
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
(57)【要約】
【課題】 ２次元光量分布を改善し、均一性の高い光量
分布を持った面光源素子の提供を目的としている。
【解決手段】 表面に拡散面２０が形成された光源２
と、該拡散面２０の端部に沿って立設され内面の少なく
ても一面が反射面１１となっている反射枠３とを備え
た。
(57) Abstract: It is an object of the present invention to provide a surface light source element having a highly uniform light amount distribution by improving a two-dimensional light amount distribution. A light source (2) having a diffusion surface (20) formed on the surface thereof.
And a reflection frame 3 provided upright along the end of the diffusing surface 20 and having at least one inner surface serving as the reflecting surface 11.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、面光源素子に関
し、特に液晶表示装置等の背面照明に用いるのに最適な
面光源素子に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface light source element, and more particularly to a surface light source element optimal for use in back lighting of a liquid crystal display device or the like.
【０００２】[0002]
【従来の技術】従来の光源として、拡散面のみを有する
冷陰極管では、拡散面内での総合配光分布が不均一であ
り、光量ムラが生じ、液晶表示パネル等の表示装置の照
明光源として用いる場合、照明ムラによる画質の劣化の
原因となり問題があった。2. Description of the Related Art As a conventional light source, a cold cathode fluorescent lamp having only a diffusing surface has a non-uniform total light distribution in the diffusing surface, which causes unevenness of light quantity, and thus an illuminating light source for display devices such as liquid crystal display panels. However, there is a problem that it causes deterioration of image quality due to uneven illumination.
【０００３】特に、中央部に対して周辺光量が数１０％
落ちるため、画像の注目点が中心からずれた画像や、パ
ノラマ的な広角で撮影した画像、特に空や海などの一様
な画像に対して、光量分布の不均一による見にくさ、汚
さ等の画質劣化が目立つという問題点を有していた。In particular, the peripheral light amount is several 10% with respect to the central portion.
As it falls, it is difficult to see the image due to the uneven light intensity distribution, such as an image where the point of interest of the image is deviated from the center or an image taken with a panoramic wide angle, especially a uniform image of the sky or the sea. There was a problem that image quality deterioration was conspicuous.
【０００４】それに対し、特開平４−８６６２０号等の
ように、光量の多い領域の透過率を下げて少ない光量の
レベルに分布を均一化するための不均一透過率フィルタ
が提案はされている。On the other hand, as in Japanese Patent Laid-Open No. 4-86620, there has been proposed a non-uniform transmittance filter for lowering the transmittance of a region having a large amount of light and making the distribution uniform at a level of a small amount of light. .
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、この方
法では表示装置の照明光量を低下させてしまうため、新
たに照明が暗いことによる画質の劣化が生じてしまう。
このため、電力効率が著しく低下してしまうという問題
点を有しており、実用上の大きな障害となっていた。However, since the amount of illumination light of the display device is reduced by this method, the image quality is deteriorated due to new dark illumination.
For this reason, there is a problem that the power efficiency is significantly reduced, which is a great obstacle to practical use.
【０００６】本発明は、２次元光量分布を改善し、均一
性の高い光量分布を持った面光源素子を提供することを
目的としている。It is an object of the present invention to provide a surface light source element which improves the two-dimensional light quantity distribution and has a highly uniform light quantity distribution.
【０００７】また、本発明は、２次元光量分布の特に１
次元方向の光量分布を改善し、特に１次元方向に均一性
が高い光量分布を持った面光源素子を提することを目的
としている。Further, the present invention is particularly applicable to the two-dimensional light amount distribution.
It is an object of the present invention to improve the light quantity distribution in the dimensional direction, and particularly to provide a surface light source element having a highly uniform light quantity distribution in the one-dimensional direction.
【０００８】また更に、本発明は、２次元光量分布が改
善され均一性が高い光量分布のうちのさらに均一性が高
い光量分布領域を選択した面光源素子を提供することを
目的としている。Still another object of the present invention is to provide a surface light source element in which a light quantity distribution region having a higher uniformity is selected from the light quantity distribution having a high two-dimensional light quantity distribution and a high uniformity.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するた
め、本発明は、表面に拡散面が形成された光源と、該拡
散面の端部に沿って立設され内面の少なくても一面が反
射面となっている反射枠とを備えたことを特徴としてい
る。In order to achieve the above object, the present invention provides a light source having a diffusing surface formed on the surface thereof, and an inner surface which is provided upright along the end of the diffusing surface and has at least one inner surface. It is characterized by having a reflection frame which is a reflection surface.
【００１０】また、本発明は、表面に拡散面が形成され
た光源と、該拡散面上に隣接して配置された三角プリズ
ムアレイと、該拡散面の端部に沿って立設され内面の少
なくても一面が反射面となっている枠とを備えたことを
特徴としている。Further, according to the present invention, a light source having a diffusing surface formed on the surface thereof, a triangular prism array arranged adjacent to the diffusing surface, and an inner surface erected along the end of the diffusing surface. It is characterized by having a frame having at least one reflecting surface.
【００１１】なお、この場合に、前記光源の２次元サイ
ズが照明対象の２次元サイズより大きく、かつ前記反射
枠の内側垂直方向に遮光板を有するとともに、該遮光板
は該照明対象の２次元サイズと略同一２次元サイズの開
口を有するようにしてもよい。In this case, the two-dimensional size of the light source is larger than the two-dimensional size of the illumination target, and the light shielding plate is provided in the vertical direction inside the reflection frame, and the light shielding plate is the two-dimensional size of the illumination target. The opening may have a two-dimensional size substantially the same as the size.
【００１２】〔作用〕本発明は、上述のように構成され
ているので、反射枠は光源の周辺部の外側に向かう光束
を内側に反射して折り曲げ光量分布を均一にするように
作用する。[Operation] Since the present invention is configured as described above, the reflection frame functions to reflect the light flux traveling toward the outside of the peripheral portion of the light source to the inside and make the bending light amount distribution uniform.
【００１３】また、三角プリズムアレイが設けられてい
るものにあっては、アレイ配列方向の配向特性が改善さ
れ該方向の光量分布を均一にするように作用する。Further, in the case where the triangular prism array is provided, the alignment characteristic in the array arrangement direction is improved and the light amount distribution in that direction is made uniform.
【００１４】また、遮光板の開口は均一性の良好な光量
分布領域を選択し面光源素子の光量分布をより均一にす
るように作用する。Further, the opening of the light shielding plate acts to select a light amount distribution region having good uniformity and to make the light amount distribution of the surface light source element more uniform.
【００１５】[0015]
（第１の実施の形態）図１は本発明の第１の実施の形態
であり、液晶ビューファインダの照明に本発明の面光源
素子を適用した表示装置の断面構成図である。(First Embodiment) FIG. 1 is a first embodiment of the present invention and is a cross-sectional configuration diagram of a display device in which a surface light source element of the present invention is applied to illumination of a liquid crystal viewfinder.
【００１６】図１において、断面がｙｚ平面となるよう
座標をとり、１は液晶表示装置であって、２は冷陰極管
からなる光源、３は内面反射枠、４と６は偏光板、５は
透過型液晶パネル（以下、ＬＣＤという。）、７は虚像
結像光学系、８は人間の眼、９は液晶表示装置１から眼
８に導かれる光束である。In FIG. 1, coordinates are set so that the cross section becomes the yz plane, 1 is a liquid crystal display device, 2 is a light source composed of a cold cathode tube, 3 is an internal reflection frame, 4 and 6 are polarizing plates, 5 Is a transmissive liquid crystal panel (hereinafter referred to as LCD), 7 is a virtual image forming optical system, 8 is a human eye, and 9 is a light beam guided from the liquid crystal display device 1 to the eye 8.
【００１７】冷陰極管２と内面反射枠３からなる面光源
素子からの拡散照明光はｚ方向に射出する白色光で、直
交ニコルに配置された２つの偏光板の一方の偏光板４に
より直線偏光のみ抽出され、ＬＣＤ５に入射した光はｘ
ｙ平面内に２次元に配列された画素により２次元画像に
応じた複屈折が与えられ、偏光板６を透過することで光
強度分布、すなわち２次元画像に変換される。The diffused illumination light from the surface light source element consisting of the cold cathode fluorescent lamp 2 and the inner reflection frame 3 is white light emitted in the z direction, and is linear by one of the two polarizing plates 4 arranged in the crossed Nicols. Only the polarized light is extracted and the light incident on the LCD 5 is x
Birefringence corresponding to a two-dimensional image is given by the pixels arranged two-dimensionally in the y plane, and is transmitted through the polarizing plate 6 to be converted into a light intensity distribution, that is, a two-dimensional image.
【００１８】カラーＬＣＤの場合はＬＣＤ５の各画素に
対応した不図示の色フィルタが配置されている。ＬＣＤ
５を透過した光のうち、光学系７のＬＣＤ側ＮＡ（光学
系７の入射瞳と焦点距離で決まる開口率）内の光のみが
眼８に導かれる。In the case of a color LCD, a color filter (not shown) corresponding to each pixel of the LCD 5 is arranged. LCD
Of the light that has passed through 5, only the light within the LCD-side NA of the optical system 7 (aperture ratio determined by the entrance pupil and the focal length of the optical system 7) is guided to the eye 8.
【００１９】ＬＣＤの場合、液晶ダイレクタの配向の非
対称性によりコントラスト分布に非対称な角度特性（視
角特性）があるため、光学系７は図１に示したようにＬ
ＣＤ５面の法線方向（ｚ方向）の主光線を導くテレセン
トリック系にしておくのが望ましい。In the case of an LCD, the contrast distribution has an asymmetrical angle characteristic (viewing angle characteristic) due to the asymmetry of the orientation of the liquid crystal director, so that the optical system 7 has an L characteristic as shown in FIG.
It is desirable to use a telecentric system that guides the principal ray in the direction normal to the CD5 surface (z direction).
【００２０】図１では全開き角（＝２ａｒｃｓｉｎＮ
Ａ）を２倍のＮＡとして表現してある。さらに人間の眼
８の網膜に到達する照度により人間の眼８の瞳孔の大き
さが変わり、それにより実質的に眼にはいる光束の径が
決まり、ＬＣＤ５の射出光に対する実質ＮＡが決まる。
画像ソースの内容により明るさが変化すること、及び光
学系７の光軸と眼８の光軸を一致させる調整を容易にす
るために、瞳孔１〜２ｍｍに対して６〜８ｍｍの光束径
を確保する必要があることから、照明用面光源素子に対
しては光学系７のＮＡに対応した光束で評価する。In FIG. 1, the full opening angle (= 2arcsinN
A) is expressed as a double NA. Further, the size of the pupil of the human eye 8 changes depending on the illuminance reaching the retina of the human eye 8, which substantially determines the diameter of the light beam entering the eye and determines the substantial NA of the light emitted from the LCD 5.
In order to facilitate the adjustment of the brightness depending on the contents of the image source and the adjustment of the optical axis of the optical system 7 and the optical axis of the eye 8 to coincide with each other, a luminous flux diameter of 6 to 8 mm is set for the pupil 1 to 2 mm. Since it is necessary to secure it, the surface light source element for illumination is evaluated by the light flux corresponding to the NA of the optical system 7.
【００２１】図２は本発明の面光源素子の構成斜視図で
あり、同図において冷陰極管２に隣接して配置された内
面反射枠３の内面１１は反射面になっており、可視域の
光を反射する反射膜が付いている。なお、拡散照明光１
０はｚ軸方向に射出される。内面反射枠３は、アクリル
やポリカーボネイト樹脂等のプラスチック材料をインジ
ェクション成形し、内面にアルミニュウム、クロム等の
金属膜あるいは誘電体多層膜等をミラー面として蒸着し
ている。このため、内面反射枠３は量産性がよく品質が
安定し低コストで作成することができる。FIG. 2 is a perspective view showing the structure of the surface light source element of the present invention. In FIG. 2, the inner surface 11 of the inner surface reflection frame 3 arranged adjacent to the cold cathode fluorescent lamp 2 is a reflection surface, and is in the visible range. With a reflective film that reflects the light of. Diffuse illumination light 1
0 is emitted in the z-axis direction. The inner reflection frame 3 is formed by injection molding a plastic material such as acrylic or polycarbonate resin, and a metal film such as aluminum or chromium or a dielectric multilayer film is deposited on the inner surface as a mirror surface. Therefore, the inner reflective frame 3 has good mass productivity, stable quality, and can be manufactured at low cost.
【００２２】さらに、ＳｉＯやＳｉＯ2 等の保護膜を蒸
着すれば、プラスチック基板上の反射膜の強度、耐久性
を向上できる。また、冷陰極管２のプラスチック部材と
一体成形することにより、部品件数を減らし信頼性を向
上させ低コスト化できる。また、重量的には不利となる
がレーザービームプリンタのポリゴンミラーに使われて
いる真鍮や黄銅等の切削性の良好な金属を直接加工し、
内面の表面粗さをミラー面にまで抑えることにより内面
反射枠３を作成することも可能であり、熱等に対する耐
久性、寸法精度、面精度、経時変化に対して有利であ
る。Furthermore, if a protective film such as SiO or SiO 2 is deposited, the strength and durability of the reflective film on the plastic substrate can be improved. Further, by integrally molding with the plastic member of the cold cathode tube 2, the number of parts can be reduced, reliability can be improved, and cost can be reduced. Also, although it is disadvantageous in terms of weight, it directly processes metals with good machinability such as brass and brass used in polygon mirrors of laser beam printers,
It is also possible to form the inner reflection frame 3 by suppressing the surface roughness of the inner surface to the mirror surface, which is advantageous for durability against heat and the like, dimensional accuracy, surface accuracy, and aging.
【００２３】また、薄いプラスチック基板にアルミ箔を
接着したミラーを作成し、それらを切り出して液晶表示
装置の鏡筒も兼ねた内面反射枠３に組み立てれば、面精
度や寸法精度は不利であるがコスト的には有利である。Further, if mirrors made by bonding aluminum foil to a thin plastic substrate are prepared and cut out and assembled into the inner reflection frame 3 which also serves as the lens barrel of the liquid crystal display device, surface accuracy and dimensional accuracy are disadvantageous. It is advantageous in terms of cost.
【００２４】図３は本発明の面光源素子による光量分布
改善の原理を説明するための断面構成図である。図２の
ｚｙ平面内の断面図である。FIG. 3 is a cross-sectional view for explaining the principle of improving the light quantity distribution by the surface light source element of the present invention. It is sectional drawing in a zy plane of FIG.
【００２５】図３において、冷陰極管２の上面は拡散面
２０となっており、冷陰極管２の構造と拡散面２０の拡
散特性により決まる配光分布をもって不図示のＬＣＤが
ある方向、ｚ方向に拡散光が射出される。In FIG. 3, the upper surface of the cold cathode fluorescent lamp 2 is a diffusion surface 20, and the LCD (not shown) has a light distribution determined by the structure of the cold cathode fluorescent lamp 2 and the diffusion characteristics of the diffusion surface 20, z. Diffuse light is emitted in the direction.
【００２６】冷陰極管２からの拡散光のうち前述の図１
における光学系７の２ＮＡ内の光のみが眼８に導かれ
る。図３の冷陰極管２の中央領域では光線２１と２２に
挟まれた角度内の光線が眼に導かれる。実際には３次元
的に円錐内の光線であるが、以下説明を簡単にするため
２次元で説明する。Of the diffused light from the cold cathode fluorescent lamp 2, the above-mentioned FIG.
Only the light within 2NA of the optical system 7 is guided to the eye 8. In the central region of the cold cathode fluorescent lamp 2 in FIG. 3, light rays within an angle between the light rays 21 and 22 are guided to the eye. Actually, the light rays are three-dimensionally within a cone, but in order to simplify the description below, they will be described in two dimensions.
【００２７】一方、周辺領域では、光線２４と仮想光線
２３との間の光線が眼８に導かれ得るが、仮想光線２３
を射出するべき冷陰極管部は冷陰極管端部の外となり存
在しないので、内面反射枠３の無い従来の面光源素子で
は周辺領域で光量が著しく落ちる原因となっていた。On the other hand, in the peripheral region, a ray between the ray 24 and the virtual ray 23 can be guided to the eye 8, but the virtual ray 23
Since the cold cathode tube portion to be emitted does not exist outside the end portion of the cold cathode tube, the conventional surface light source element without the inner reflection frame 3 causes a significant decrease in the light amount in the peripheral region.
【００２８】本実施の形態における面光源素子において
は内面反射枠３が存在するため、従来では２ＮＡに入ら
ない光線２６を内面反射枠３の反射により光線２５とし
て２ＮＡ内に折り返し、周辺光量の落ちを回復すること
ができる。In the surface light source element according to the present embodiment, since the inner reflection frame 3 is present, the light ray 26 which does not enter the 2NA in the prior art is reflected by the inner reflection frame 3 to be returned as the light ray 25 into the 2NA, and the peripheral light amount drops. Can be recovered.
【００２９】内面反射枠３の内面反射面の高さをｈ、拡
散面２０からＬＣＤの位置までの距離をｚ０、中心光束
の法線の周辺部からの位置をｙ0 、拡散面の大きさをｙ
1 、各光束が法線となす角をα、θ＝ａｒｃｓｉｎＮＡ
とする。内面反射枠３が無い場合、周辺部ｙ0 の位置に
おけるＬＣＤ入射光束のうち、光学系７のＮＡ内に入る
光束は、 左周辺部； ０≦ｙ0 ≦ｚ0 ・ｔａｎθ 右周辺部； ｙ1 −ｚ0 ・ｔａｎθ≦ｙ0 ≦ｙ1 で、それぞれ、ＬＣＤの位置で法線を中心に時計回り方
向を正にとると、 左周辺部； −θ≦α≦ａｒｃｔａｎ（ｙ0 ／ｚ0 ） 右周辺部； −ａｒｃｔａｎ（（ｙ1 −ｙ0 ）／ｚ0 ）
≦α≦θ となり、端部に近くなるほど光量が落ちることがわか
る。The height of the inner reflecting surface of the inner reflecting frame 3 is h, the distance from the diffusing surface 20 to the position of the LCD is z0, the position from the peripheral part of the normal line of the central light beam is y 0 , and the size of the diffusing surface. Y
1 , the angle that each light beam makes with the normal is α, θ = arcsinNA
And Without the inner reflection frame 3, among the LCD incident light fluxes at the position of the peripheral portion y 0 , the light fluxes that enter the NA of the optical system 7 are the left peripheral portion; 0 ≦ y 0 ≦ z 0 · tan θ the right peripheral portion; y 1 −z 0 · tan θ ≦ y 0 ≦ y 1 , and when the clockwise direction centered on the normal line at the position of the LCD is positive, the left peripheral portion; −θ ≦ α ≦ arctan (y 0 / z 0 ) right periphery; -arctan ((y 1 -y 0 ) / z 0)
≦ α ≦ θ, and it can be seen that the amount of light decreases toward the edge.
【００３０】本発明の内面反射枠３がある場合、 左周辺部； −θ≦α≦ａｒｃｔａｎ（ｙ0 ／（ｚ0 −
ｈ））またはθ 右周辺部； −θまたは−ａｒｃｔａｎ（（ｙ1 −ｙ
0 ）／（ｚ0 −ｈ））≦α≦θ の光束が光学系７のＮＡ内に導かれるため、周辺光量落
ちを改善できることがわかる。この式から、光学系７の
ＮＡに合わせてＬＣＤ位置ｚ0 と反射枠高さｈをなるべ
く近づけた方が光量落ちの改善効果が高いこともわか
る。[0030] If there is internal reflection frame 3 of the present invention, the left peripheral portion; -θ ≦ α ≦ arctan (y 0 / (z 0 -
h)) or θ right peripheral part; −θ or −arctan ((y 1 −y
It is understood that since the luminous flux of 0 ) / (z 0 -h)) ≦ α ≦ θ is guided into the NA of the optical system 7, the peripheral light amount drop can be improved. From this equation, it can be seen that the effect of improving the light quantity drop is higher when the LCD position z 0 and the reflection frame height h are brought as close as possible in accordance with the NA of the optical system 7.
【００３１】図４は本実施の形態による光量分布均一化
の効果を示す光量分布の模式図である。横軸はｙ軸座標
で面光源素子のｙ方向のサイズをｙ1 としている。縦軸
は光学系７のＮＡ内（３次元円錐内）に導かれる光量Ｉ
を示す。破線３１は内面反射枠３が無い場合の従来の光
量分布を示し、周辺光量は中央部に対して３０％にまで
落ちている。実線３０は本実施の形態により改善された
光量分布を示し、周辺部の光量は７０％まで回復してい
る。FIG. 4 is a schematic diagram of the light amount distribution showing the effect of making the light amount distribution uniform according to the present embodiment. The horizontal axis is the y-axis coordinate, and the size of the surface light source element in the y direction is y 1 . The vertical axis represents the amount of light I guided into the NA of the optical system 7 (in the three-dimensional cone).
Is shown. The broken line 31 shows the conventional light amount distribution in the case where the inner reflection frame 3 is not provided, and the peripheral light amount falls to 30% with respect to the central portion. The solid line 30 shows the light amount distribution improved by the present embodiment, and the light amount in the peripheral portion has recovered to 70%.
【００３２】ｘｚ平面内でも同じ効果があるため、本実
施の形態により光量分布の均一化がｙ軸方向ばかりでな
く、ｘ軸方向にもなされ、面光源の光量分布の２次元的
均一化が達成される。Since the same effect is obtained in the xz plane, the light quantity distribution is made uniform not only in the y-axis direction but also in the x-axis direction by the present embodiment, and the light quantity distribution of the surface light source is made two-dimensionally uniform. To be achieved.
【００３３】（第２の実施の形態）次に、本発明に係る
第２の実施の形態について説明する。(Second Embodiment) Next, a second embodiment according to the present invention will be described.
【００３４】本実施の形態は面光源素子に指向性制御素
子を設けることにより、指向性の改良を加えて均一性を
改善した面光源素子を提供することにある。The present embodiment is to provide a surface light source element in which the directivity is improved and the uniformity is improved by providing the surface light source element with a directivity control element.
【００３５】図５は面光源素子の断面構成図であって、
図３で説明したものと同一または相当する部分には同一
符号を付す。図５において、拡散面２０の上に隣接して
プリズムアレイ４０を設けることにより、ｙ方向の拡散
光の配光特性を改善すると同時に内部反射枠３により光
量分布の均一化を達成している。つまりプリズムアレイ
４０の配向制御による光量分布均一化効果と、第１の実
施の形態と同じ光量分布均一化効果により、さらに均一
性が改善される。FIG. 5 is a sectional view of the surface light source element.
The same or corresponding parts as those described in FIG. 3 are designated by the same reference numerals. In FIG. 5, the prism array 40 is provided adjacent to the diffusing surface 20 to improve the light distribution characteristic of the diffused light in the y direction, and at the same time, the internal reflection frame 3 achieves a uniform light amount distribution. That is, the uniformity is further improved by the light amount distribution uniforming effect by the orientation control of the prism array 40 and the same light amount distribution uniforming effect as in the first embodiment.
【００３６】（第３の実施の形態）次に、本発明に係る
第３の実施の形態について説明する。(Third Embodiment) Next, a third embodiment of the present invention will be described.
【００３７】図６は第３の実施の形態を示したもので、
図１で説明したものと同一または相当する部分には同一
符号を付す。図６において、ＬＣＤ７の画像表示サイズ
領域に対し面光源素子２、３を大きくし、その光量分布
の均一性の高い領域のみを照明として用いている。その
ため無駄な照明部分が増え電力効率が落ちかつ装置とし
ての大きさ・重量とも不利になるが、画質としては理想
的なレベルが得られる。なお不要の照明をカットするた
めの遮光板４１は迷光対策として用いている。このよう
な構成により、光量分布の最も均一性が高い領域を遮光
板４１の開口により選択できるようになり、きわめて良
質な画質が得られる。FIG. 6 shows a third embodiment.
The same or corresponding parts as those described in FIG. 1 are designated by the same reference numerals. In FIG. 6, the surface light source elements 2 and 3 are made larger than the image display size area of the LCD 7, and only the area where the light amount distribution is highly uniform is used as illumination. As a result, unnecessary lighting portions increase, power efficiency decreases, and the size and weight of the device are disadvantageous, but an ideal level for image quality can be obtained. The light shielding plate 41 for cutting off unnecessary illumination is used as a measure against stray light. With such a configuration, it is possible to select the region with the most uniform light amount distribution by the opening of the light shielding plate 41, and an extremely high quality image can be obtained.
【００３８】なお、このように本発明の本質は、端部、
周辺部の光量落ちを回復できることであるから、以上説
明した３つの実施の形態のように４つの反射面を持つ反
射枠という実施形態に限定されるものではなく、たとえ
ば反射面が１面のみであっても、対応する端部、周辺部
の光量落ちを回復し、光量分布の均一化に効果があるこ
とはいうまでもない。As described above, the essence of the present invention is that the end portion,
Since it is possible to recover the light amount drop in the peripheral portion, the present invention is not limited to the embodiment of the reflection frame having four reflecting surfaces as in the above-described three embodiments, and for example, only one reflecting surface is provided. Even if there is, it goes without saying that it is effective in recovering the light amount drop at the corresponding end portion and the peripheral portion and making the light amount distribution uniform.
【００３９】また、図３と数式を用いて説明したよう
に、本発明は適用する装置に合わせて反射面３の高さｈ
や反射面３のｘ軸方向、ｙ軸方向の位置を最適化する事
ができ、実施の形態に示された配置に限定されるもので
はない。さらに、ｚ軸方向に関しても拡散面２に反射面
３が接してなく、隙間が存在しても効果が無くなるわけ
ではない。Further, as described with reference to FIG. 3 and the mathematical formulas, according to the present invention, the height h of the reflecting surface 3 is adjusted according to the apparatus to which it is applied.
The position of the reflection surface 3 in the x-axis direction and the position of the reflection surface 3 can be optimized, and the arrangement is not limited to the arrangement shown in the embodiment. Further, also in the z-axis direction, the reflecting surface 3 is not in contact with the diffusing surface 2, and even if there is a gap, the effect does not disappear.
【００４０】また、実施の形態では簡単のため反射面３
が拡散面２と略垂直の場合についてのみ説明したが、本
発明によれば、配光特性と必要なＮＡによっては、反射
面２を傾けることにより配光を制御し、より効率よく照
明光を所望の方向に導くことができ、広い意味での光量
分布の均一化が可能である。例えば本発明によれば４つ
の反射面の傾き角度が異なり、対面同士が平行、ハの
字、逆ハの字等の構成を、仕様に合わせて光量分布を均
一にするように自由に設定可能である。In the embodiment, the reflecting surface 3 is used for simplicity.
However, according to the present invention, depending on the light distribution characteristics and the required NA, the light distribution can be controlled by tilting the reflecting surface 2 so that the illumination light can be emitted more efficiently. It can be guided in a desired direction, and the light quantity distribution can be made uniform in a broad sense. For example, according to the present invention, the inclination angles of the four reflecting surfaces are different, and the facing surfaces can be freely set such that the facing surfaces are parallel, C-shaped, and inverted C-shaped so as to make the light amount distribution uniform according to the specifications. Is.
【００４１】[0041]
【発明の効果】以上説明したように、本発明によれば、
２次元光量分布を改善し、均一性の高い光量分布を持っ
た面光源素子を提供することができる。As described above, according to the present invention,
It is possible to improve the two-dimensional light quantity distribution and provide a surface light source element having a highly uniform light quantity distribution.
【００４２】また、本発明によれば、２次元光量分布の
特に１次元方向の光量分布を改善し、特に１次元方向に
均一性が高い光量分布を持った面光源素子を提供するこ
とができる。Further, according to the present invention, it is possible to provide a surface light source element having a two-dimensional light quantity distribution, particularly a one-dimensional light quantity distribution improved, and having a highly uniform light quantity distribution, particularly in the one-dimensional direction. .
【００４３】また更に、本発明によれば、遮光板の開口
を均一性の良好な光量分布領域を選択するようにすれば
照射する光量分布をより均一にすることができる。Further, according to the present invention, if the aperture of the light shielding plate is selected to select a light amount distribution region having good uniformity, the light amount distribution for irradiation can be made more uniform.
【図１】本発明の第１の実施の形態に係る面光源素子を
用いた表示装置の構成断面図である。FIG. 1 is a configuration cross-sectional view of a display device using a surface light source element according to a first embodiment of the present invention.
【図２】本発明の第１実施の形態に係る面光源素子の斜
視図である。FIG. 2 is a perspective view of the surface light source element according to the first embodiment of the present invention.
【図３】本発明の第１実施の形態に係る面光源素子の原
理を説明する図である。FIG. 3 is a diagram illustrating the principle of the surface light source element according to the first embodiment of the invention.
【図４】本発明の第１実施の形態に係る面光源素子の光
量分布図である。FIG. 4 is a light quantity distribution diagram of the surface light source element according to the first embodiment of the present invention.
【図５】本発明の第２実施の形態に係る面光源素子の断
面構成図である。FIG. 5 is a sectional configuration diagram of a surface light source element according to a second embodiment of the present invention.
【図６】本発明の第３実施の形態に係る面光源素子を用
いた表示装置の断面構成図である。FIG. 6 is a sectional configuration diagram of a display device using a surface light source element according to a third embodiment of the present invention.
１ 液晶表示装置 ２ 冷陰極管 ３ 内面反射枠 ５ 透過型液晶パネル ２０ 拡散面 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 2 Cold cathode tube 3 Internal reflection frame 5 Transmission type liquid crystal panel 20 Diffusing surface
Claims (3)
散面の端部に沿って立設され内面の少なくても一面が反
射面となっている反射枠とを備えたことを特徴とする面
光源素子。1. A light source having a diffusing surface formed on a surface thereof, and a reflecting frame provided upright along an end of the diffusing surface and having at least one inner surface serving as a reflecting surface. Surface light source element.
散面上に隣接して配置された三角プリズムアレイと、該
拡散面の端部に沿って立設され内面の少なくても一面が
反射面となっている枠とを備えたことを特徴とする面光
源素子。2. A light source having a diffusing surface formed on the surface thereof, a triangular prism array disposed adjacent to the diffusing surface, and an inner surface standing at least along one end of the diffusing surface. A surface light source element, comprising: a frame having a reflective surface.
次元サイズより大きく、かつ前記反射枠の内側垂直方向
に遮光板を有するとともに、該遮光板は該照明対象の２
次元サイズと略同一２次元サイズの開口を有することを
特徴とする請求項１又は２記載の面光源素子。3. The two-dimensional size of the light source is 2 to be illuminated.
The size of the light-shielding plate is larger than the dimension size, and the light-shielding plate is provided in the vertical direction inside the reflection frame.
The surface light source element according to claim 1 or 2, wherein the surface light source element has an opening having a two-dimensional size substantially the same as the two-dimensional size.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7220870A JPH0962197A (en) | 1995-08-29 | 1995-08-29 | Surface light source element |
| US08/546,085 US5929951A (en) | 1994-10-21 | 1995-10-20 | Illumination device and display apparatus including same |
| US09/328,476 US6633350B2 (en) | 1994-10-21 | 1999-06-09 | Illumination device and display apparatus including same |
| US10/465,232 US20040046910A1 (en) | 1994-10-21 | 2003-06-20 | Illumination device and display apparatus including same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7220870A JPH0962197A (en) | 1995-08-29 | 1995-08-29 | Surface light source element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0962197A true JPH0962197A (en) | 1997-03-07 |
Family
ID=16757839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7220870A Pending JPH0962197A (en) | 1994-10-21 | 1995-08-29 | Surface light source element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0962197A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100432793C (en) * | 2005-05-20 | 2008-11-12 | 爱普生映像元器件有限公司 | Display device |
| JP2012029641A (en) * | 2010-07-30 | 2012-02-16 | Toyo Seikan Kaisha Ltd | Fermentation method |
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| JPH01272003A (en) * | 1988-04-21 | 1989-10-31 | Fujitsu Ltd | Light conducting panel |
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1995
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| JPS6359356U (en) * | 1986-10-06 | 1988-04-20 | ||
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| JPH01272003A (en) * | 1988-04-21 | 1989-10-31 | Fujitsu Ltd | Light conducting panel |
| JPH02285388A (en) * | 1989-04-27 | 1990-11-22 | Mitsubishi Rayon Co Ltd | light source device |
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|---|---|---|---|---|
| CN100432793C (en) * | 2005-05-20 | 2008-11-12 | 爱普生映像元器件有限公司 | Display device |
| JP2012029641A (en) * | 2010-07-30 | 2012-02-16 | Toyo Seikan Kaisha Ltd | Fermentation method |
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