CN101013227A - Surface light source device and display device using the same - Google Patents

Surface light source device and display device using the same Download PDF

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CN101013227A
CN101013227A CN 200610064416 CN200610064416A CN101013227A CN 101013227 A CN101013227 A CN 101013227A CN 200610064416 CN200610064416 CN 200610064416 CN 200610064416 A CN200610064416 A CN 200610064416A CN 101013227 A CN101013227 A CN 101013227A
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light
source
led
defined
includes
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CN 200610064416
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CN100565298C (en )
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境诚司
米田俊之
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三菱电机株式会社
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Abstract

A surface light source device according to the invention includes a housing having an opening portion on at least one face, an LED light source held by one face of the housing opposing the opening portion, and a light guiding plate arranged at a position so as to cover the opening portion and the LED light source, wherein the light guiding plate includes a recess provided at a position corresponding to the LED light source for storing a part of the LED light source, and light quantity adjusting means provided at a bottom part of the recess for adjusting light from the LED light source, and the light quantity adjusting means includes a reflection sheet having a reflection function and a transmission function in which a total light transmittance t satisfies t>=pir<2 >cos theta/{(1-cos theta)(S-pir<2>, supposing that an average radius is defined as r, a distance from the LED light source is defined as H, a light-emitting area of the LED light source is defined as S, and a total light quantity is defined as L.

Description

面状光源装置以及使用其的显示装置 Planar light source device and a display device using the

技术领域 FIELD

本发明是与光源相关的发明,特别涉及一种面状光源装置以及使用其的显示装置。 The present invention is related to a light source of the present invention, particularly to a planar light source device and a display device using thereof.

背景技术 Background technique

现有的面状光源装置为如下构造:如专利文献1所示,设置有用于在导光板的背面插入光源的圆锥形状的凹陷,并且在该凹陷中固定LED等光源。 Conventional planar light source device is configured as follows: As shown in Patent Document 1, is provided with a conical recess for insertion of the light source on the back surface of the light guide plate and a light source such as an LED fixed in the recess. 由于该光源插入用凹陷为圆锥形状,所以至少前端部越往里宽度越窄。 Since the light source insertion concave conical shape, so at least the distal end portion of the inside width becomes narrower. 如此,现有的面状光源装置能够减少从光源直接射出的光的量,并能够减低亮度不均匀。 Thus, the conventional planar light source device capable of reducing the amount of light emitted from the light source directly, and the luminance unevenness can be reduced.

而且,专利文献2所示的面状光源装置在形成在导光板的后面的光源插入部压入LED等光源,在光源前方形成光反射面,由该光反射面遮挡从光源射出并朝向前方的光,将反射的光从光源插入部的侧壁面导入导光板的内部,并且使导光板的前射出面的亮度分布均匀化。 Further, the planar light source device shown in Patent Document 2 is formed in the back of the light guide plate is pressed into the insertion portion of the light source such as an LED light source, a light reflecting surface is formed in front of a light source is blocked by the light reflecting surface and is emitted from the light source toward the front of light, the reflected light into the light guide plate from the side wall surface of the insertion portion of the light source, the light guide plate and the front face of the emitted luminance distribution uniform.

进而,专利文献3所示的液晶显示装置形成用于在导光板的中央下部容纳冷阴极荧光灯的槽,由在槽的底面配置的透光调整膜的图形等调整遮光量或反射量,显示面的整个面亮度均匀,提高了冷阴极荧光灯的利用效率。 Further, as shown in the liquid crystal display device in Patent Document 3 is formed in a center of the lower guide plate for receiving cold cathode fluorescent lamp groove, adjusted by the light-transmitting grooves arranged in the bottom surface of the light shielding film pattern and the like to adjust the amount or the amount of reflection, the display surface the entire surface of uniform brightness, improves the efficiency of cold cathode fluorescent lamp.

(专利文献1)专利第3427636号公报(专利文献2)特开平10-82916号公报(专利文献3)特开平10-104620号公报另外,在使用专利文献1所示的现有面状光源装置的情况下,圆锥形状的凹陷部分的亮度比其它部分稍高一些。 (Patent Document 1) Patent Publication No. 3427636 (Patent Document 2) Japanese Patent Publication No. 10-82916 (Patent Document 3) Japanese Patent Publication No. 10-104620 In the conventional planar light source device shown in Patent Document 1 in the case where the luminance of the conical recessed portion slightly higher than the number of the other portions. 如此,现有的面状光源装置在进一步要求面内亮度均一化的情况下就不能得到足够的显示等级。 Thus, the conventional planar light source device further required in the case of in-plane uniform brightness of the display can not be obtained a sufficient level.

而且,在使用专利文献2所示的现有面状光源装置的情况下,由于朝向光源前方的直接光部分地透过,因此光未充分地扩散,具有在光源前方产生亮度不均匀之类的问题。 Further, in the case of the conventional planar light source device shown in Patent Document 2, since the direct light toward the light transmitted through the forward portion, so that the light is not sufficiently diffused, having a luminance unevenness or the like in front of the light source problem.

而且,在使用专利文献3所示的现有面状光源装置的情况下,由于由图形等对来自光源的直接光进行遮光并调整,因此光也未充分地扩散,也具有在光源前方产生亮度不均匀之类的问题。 Further, in the case of the conventional planar light source device shown in Patent Document 3, since the graphics and adjusted by direct light from the light source is shielded, the light can not sufficiently diffuse, also has a luminance in front of the light source problems such unevenly.

发明内容 SUMMARY

因此,本发明的目的在于提供一种光的利用效率高且面内亮度的均一性高的、具有足够显示等级的面状光源装置及使用其的显示装置。 Accordingly, an object of the present invention is to provide a high light use efficiency and the brightness of the high in-plane uniformity, having a planar light source device and a sufficient level display apparatus using the display thereof.

本发明的面状光源装置具备:至少在一面上具有开口部的壳体;在与开口部相对的壳体的一面上保持的光源;以及在覆盖开口部和光源的位置处配置的导光板,导光板具备:设置在与光源相对应的位置处并容纳光源的一部分的凹部;以及设置在凹部的底部并调整来自光源的光的光量调整单元,光量调整单元具备反射片,该反射片在设平均半径为r、离光源的距离为H、光源的发光面积为S、光源的总光量为L的情况下,具有反射来自光源的光的反射功能、以及全光线透过率t满足t≥πr2cosθ/{(1-cosθ)(S-πr2)}关系的透过功能。 The planar light source device of the present invention includes: at least one side of the housing having an opening portion; a light source on one side of the holding portion and the opening opposite the housing; and a guide plate disposed at the position covering the opening portion and the light source, the light guide plate includes: disposed in the recess portion and at a position to light source and receiving a light source; and a bottom of the recess and adjusting the light from the light source of the light amount adjusting means, the light amount adjusting means includes a reflective sheet, the reflective sheet provided light reflecting function of the average radius r, the distance from the light source is H, the light emitting area of ​​the light source is S, the total light amount of the light source is L, the reflection from the light source having, a total light transmittance and t satisfies t≥πr2cosθ / {(1-cosθ) (S-πr2)} through a functional relationship.

由于设置在凹部的底部并调整来自光源的光的光量调整单元具备反射片,该反射片具有反射来自光源的光的反射功能、以及全光线透过率t满足t≥πr2cosθ/{(1-cosθ)(S-πr2)}关系的透过功能,因此本发明记载的面状光源装置具有光的利用效率高且面内亮度均一性高的、能够具有足够显示等级的效果。 Since the bottom of the recess and the light from the light source to adjust the light amount adjusting means comprises a reflective sheet, the reflective sheet having a function of light reflected from the light source, and the total light transmittance t satisfies t≥πr2cosθ / {(1-cosθ ) (permeation function, thus the planar light source device according to the present invention, a high S-πr2)} the relationship between light use efficiency and having a high in-plane uniformity of brightness can be displayed with a sufficient level of effect.

附图说明 BRIEF DESCRIPTION

图1是本发明实施方式1的面状光源装置的分解立体图。 FIG 1 is an exploded perspective view of a surface light source device 1 of the embodiment of the present invention.

图2是本发明实施方式1的面状光源装置的截面图。 2 is a sectional view of a surface light source device according to Embodiment 1 of the present invention.

图3是用于说明本发明实施方式1的LED光源的特性的图。 FIG 3 is a diagram for explaining embodiment 1 of the LED light source characteristics.

图4是本发明实施方式1的光量调节单元的截面图。 FIG 4 is a sectional view of the light amount adjustment unit of Embodiment 1 of the present invention.

图5是用于说明在本发明实施方式1的光量调节单元中使用的反射片的反射特性的图。 FIG 5 is a view for explaining the embodiment of the present invention showing the reflection characteristics of the reflecting sheet means for use in a light quantity adjustment.

图6是用于说明在本发明实施方式1的光量调节单元中使用的反射片的透过特性的图。 FIG 6 is a diagram illustrating a reflection sheet used in the embodiment of the present invention the light amount adjustment unit 1 for explaining transmission characteristics.

图7是在本发明实施方式1的光量调节单元中使用的反射片的概略图。 7 is a schematic view of a reflection sheet used in the embodiment of the present invention the light quantity adjusting unit 1.

图8是本发明实施方式2的面状光源装置的截面图。 8 is a sectional view of a surface light source device according to Embodiment 2 of the present invention.

图9是在本发明实施方式3的光量调节单元中使用的反射片的概略图。 9 is a schematic view of a reflection sheet used in the embodiment of the present invention the light amount adjustment unit 3.

图10是本发明实施方式4的导光板和反射片的正面图和截面图。 FIG 10 is a front view and a cross-sectional view of an embodiment of the present invention, the light guide plate and the reflective sheet 4.

具体实施方式 detailed description

(实施方式1)图1示出本实施方式的面状光源装置的分解立体图。 An exploded perspective view of a planar light source device (Embodiment 1) FIG. 1 illustrates an embodiment according to the present embodiment. 另外,图2示出本实施方式的面状光源装置的截面图。 Further, FIG. 2 a sectional view of the planar light source device according to the present embodiment illustrated embodiment. 在图1示出的面状光源装置中,具备:在一个面上形成有开口部1的壳体2;通过LED(发光二极管)基板3保持在与开口部1相对的面上的LED光源4;在覆盖开口部1和LED光源4的位置处设置的导光板5;在与LED光源4相对应的导光板5的位置处设置的圆柱形状的凹部6;以及在凹部6的底部设置的光量调整单元7。 In the planar light source device shown in FIG. 1, includes: an opening portion 2 of the housing 1 is formed on one surface; LED light source 4 is maintained at a surface opposite to the opening portion by a LED (light emitting diode) substrate 3 ; covering the opening portion 1 and the LED light guide plate 5 at positions 4 provided; recessed portion of the cylindrical shape is disposed at a position the LED light source 4 corresponding to the light guide plate 5, 6; and the amount of light provided at the bottom of the recess 6 adjusting means 7. 另外,从图2可知,LED光源4的一部分容纳在凹部6内。 Further, apparent from FIG. 2, LED light source portion 4 is received in the recess 6.

而且,在导光板5和壳体2之间(导光板5的侧面8和射出面相反面9)设置有反射片10,在导光板5的射出面11的整个面上设置有扩散板12和光学片组13。 Further, between the light guide plate 5 and the housing 2 (the light guide plate and the exit side surface 5 of the opposite surface 8 9) is provided with a reflection sheet 10, a diffusion plate 12 is provided on the entire surface and the exit surface of the optical guide plate 5 11 sheet group 13. 另外,导光板5的射出面11与壳体2的开口部1相一致。 Further, the opening portion 5 of the light guide plate exit surface 11 of the housing 2 coincide 1.

本实施方式使用的光源考虑使用发光二极管(LED光源4)或激光二极管(Laser Diode:LD)等点光源。 Consider the present embodiment uses a light source using a light emitting diode (LED light source 4) or a laser diode (Laser Diode: LD) and other point light sources. LED光源4有伪白色LED,其由发出蓝色等单色光的半导体发光元件和吸收从半导体发光元件发出的蓝色光的一部分并且发出黄色光的荧光体构成。 LED light source 4 pseudo white LED, a semiconductor light emitting element emits blue monochromatic light and the like absorbs the blue light emitted from the semiconductor light emitting element and a portion which emits fluorescence composed of yellow light. 另外,还有备齐RED(红)、GREEN(绿)、BLUE(蓝)的半导体发光元件并且通过三种单色光的合成而发出白色光的LED。 In addition, there get ready RED (Red), GREEN (green), a semiconductor light emitting element BLUE (blue), and the LED emits white light by combining three kinds of monochromatic light. 以下根据LED光源4使用伪白色LED的情况来说明本实施方式的面状光源装置。 The case of using the pseudo white LED 4 LED light sources described planar light source device of the present embodiment.

其次,本实施方式的导光板5由透明丙烯酸树脂、聚碳酸酯树脂、玻璃等构成。 Next, the light guide plate 5 of the present embodiment of a transparent acrylic resin, polycarbonate resin, glass or the like. 而且,导光板5如图1和图2所示为板状形状,在射出面相反面9上设置了圆柱状的凹部6。 Further, the light guide plate 5 in FIG. 1 and FIG. 2 is a plate-like shape, emitted at the opposite surface 9 is provided a cylindrical recess 6. 进而,在导光板5的射出面相反面9上形成有光散射部(未图示),该光散射部用于使光的传播方向散乱并且用于将光导向射出面。 Furthermore, light scattering portion is formed (not shown), the light scattering section for scattering light propagating direction and for guiding the light emitted from the light guide plate exit surface on the opposite surface 5 9. 该光散射部作用为朝向导光板5的内部反射光的单元。 The light scattering portion functions as the cell internal reflection of light toward the light guide plate 5. 作为反射的手段考虑使用在射出面相反面9上印刷点图形的方法、将射出面相反面9粗面化以形成褶皱面的方法、以及在射出面相反面9上形成微小球面或凹凸的方法等。 Considered as a means to use the reflection dot pattern printed on the reverse side of the exit surface 9, opposite the exit surface 9 to form a roughened surface wrinkles method, and is emitted in the opposite surface 9 of spherical fine irregularities or the like forming process.

另外,通过将导光板5的射出面11粗面化以形成褶皱面,能够获得与在导光板5的射出面相反面9上设置反射单元的情况相同的效果。 Further, by the exit surface 5 of the light guide plate 11 to form a fold roughened surface can be obtained with the case where the reflector unit 9 on the opposite surface of the light guide plate 5 is emitted same effect. 也即,入射到导光板5的射出面11上的光通过由射出面11粗面化所形成的凹凸而使光的传播方向散乱。 That is, the propagation direction of light incident on the exit surface of the light guide plate 11 by the exit surface 5 of the roughened surface 11 formed by the unevenness of light scattering. 其结果是,入射到射出面11的光的一部分朝向导光板5的内部反射,并且除此以外的光经由射出面11射出到导光板5的外部。 As a result, part of the light incident on the exit surface of the light guide plate 11 toward the interior of the reflector 5, and light other than via the exit face 11 of the light guide plate 5 is emitted to the outside. 从而,即使在仅导光板5的射出面11形成褶皱面,射出面相反面9未设置反射单元的情况下,也能够具有就像在射出面相反面9设置的点图形一样的反射功能。 Thereby, even when the wrinkle is only the emission surface 11 of the light guide plate 5, opposite the exit surface of the reflection unit 9 is not provided, it is possible with a reflection function as a dot pattern in the exit surface 9 disposed opposite same.

其次,本实施方式的LED光源4如图2所示配置成安装在LED基板3上并且插入凹部6内。 Secondly, the LED light source of the present embodiment is configured as shown in FIG 4 is mounted on the LED substrate is inserted into the recess 3 and 6. 该LED基板3保持LED光源4,并且形成有用于向LED光源4供给电力的电路图形。 The LED light source holder 3 LED board 4, and the circuit pattern for supplying electric power to the LED light source 4 is formed. 另外,通过安装在作为金属芯(Metal Core:MC)基板的LED基板3上,从LED光源4发出的热能够有效地传递到周围。 Further, by installing a metal core (Metal Core: MC) on the LED of substrates 3 can be efficiently transferred from the heat emitted from the LED light source 4 to the surroundings. LED光源4通过安装在厚度薄的FPC(柔性印刷线路)上,从LED光源4发出的热能够进一步有效地传递到周围,并且面状光源装置的外形尺寸也能够减小。 4 by an LED light source mounted on a thin FPC (flexible printed circuit), it can be more effectively transferred from the heat emitted from the LED light source 4 to the surroundings, and the planar dimensions of the light source apparatus can be reduced.

另外,通过使用如图3所示的在大致水平方向上具有最大亮度的LED光源4,从LED光源4发出的光以锐角的入射角度入射到导光板5的凹部6的侧面上。 Further, as shown by using a light source having a maximum brightness of the LED 3 shown in FIG. 4 in a substantially horizontal direction, emitted from the LED light source 4 incident angle of light incident at an acute angle to the side of the concave portion 6 of the light guide plate 5. 如此,来自LED光源4的光的入射效率上升,在壳体2的开口部1处的亮度上升。 Thus, the incident efficiency of light from the LED light source 4 is increased, the brightness at the opening portion 2 of the housing 1 is increased.

其次,本实施方式的壳体2在内侧设置了反射片10,使得光尽可能不泄漏到外部,并且使光到达开口部1。 Secondly, according to the present embodiment, the housing 2 is provided inside the reflection sheet 10, so that the light does not leak to the outside as much as possible, and the light reaches the opening portion 1. 该反射片10可使用在PP(聚丙烯)或PET(聚对苯二甲酸乙二醇酯)中混合有硫酸钡或氧化钛的材料、或在树脂中形成有微细气泡的材料、在金属板上蒸镀有银的材料、在金属板上涂覆有包含氧化钛的涂料的材料。 The reflection sheet 10 may be used in PP (polypropylene) or PET (polyethylene terephthalate) material mixed with barium sulfate or titanium oxide, or materials for forming fine air bubbles in the resin, the metal plate silver-vapor-deposited material, a coating with a material containing titanium oxide coating on a metal plate. 另外,反射片10最好是反射率为90%以上。 Further, the reflection sheet 10 is preferably more than a reflectance of 90%. 此外,由于通过重叠多个反射片10使反射率提高,所以壳体2的开口部1的亮度上升。 Further, since a plurality of reflection sheets 10 by overlapping the reflectance increase, so the opening portion 2 of the housing 1 is increased luminance.

进而,通过在反射片10的射出面侧或射出面相反侧印刷点图形,能够改善射出面的亮度分布(profile)。 Further, light emitted by the emission surface side or the exit side opposite the reflection side of the printing sheet 10 dot pattern, it is possible to improve the luminance distribution (profile). 另外,通过在反射片10的射出面侧或射出面相反侧实施有色印刷,从而由导光板5的光吸收或反射片10的光吸收,能够改善由于远离光源而使射出光的颜色变化的现象。 Further, by the opposite side of the embodiment of the colored printing or exit surface of the exit plane side reflection sheet 10 so as to absorb or reflect light absorbing sheet 10 by the light guide plate 5 can be improved since the light emitted from the light source the color change phenomenon . 特别地,由于通过在反射片10的射出面相反侧实施色印刷,能够使对射出面一侧的影响钝化,因此能够校正射出面的微妙的亮度不均匀或颜色不均匀。 Particularly, since the exit surface on the opposite side of the reflection sheet 10-color printing embodiment allows the effect on the exit surface side passivation, thus capable of correcting luminance unevenness subtle exit plane or uneven color.

其次,如图2所示,在导光板5的射出面11(壳体2的开口部1)配置有扩散板12。 Next, as shown in FIG. 2, the exit surface 11 (an opening of the housing 2) of the light guide plate 5 is disposed a diffusion plate 12. 该扩散板可使用PET(聚对苯二甲酸乙二醇酯)、PMMA(丙烯酸)或PC(聚碳酸酯)等树脂板或者玻璃基板这样的具有透光性质的材料。 The diffusion plate may be used PET (polyethylene terephthalate), a material having light-transmitting properties such PMMA (acrylic) or PC (polycarbonate) or the like resin plate or a glass substrate. 另外,在上述材料中混入反射材料、或使表面粗面化,以使扩散板12具有使入射光散射的功能。 Further, a reflective material incorporated in the above-described materials, or to roughen the surface, so that the diffusion plate 12 having a function of diffusing incident light. 通过使用具有该功能的扩散板12,能够得到具有宽指向性的面状光源装置。 By using a diffusion plate 12 having such a function, it is possible to obtain planar light source device having a wide directivity. 另外,有时根据面状光源装置构造,即使不设置扩散板12也能得到所期望的显示等级,在该情况下没有必要特别设置扩散板12。 In some cases, according to the planar light source device is constructed, even if the diffusion plate 12 is not provided can be obtained a desired level display, in particular, is not necessary provided the diffusion plate 12 in this case.

进而,如图2所示,在扩散板12上设置由多个光学片构成的光学片组13。 Further, as shown in Figure 2, an optical sheet group composed of a plurality of optical sheets 13 on the diffusion plate 12. 该光学片组13成为由扩散片夹持透镜片的构造。 The optical sheet group 13 has a structure sandwiched by the diffusion sheet lens sheet. 另外,在需要提高亮度的情况下,使用多个透镜片最佳地组合在各个片形成的棱镜的方向。 Further, in a case where the need to improve the luminance, the use of a plurality of direction of the prism lens sheets combined in preferred form each piece. 进而,在提高扩散片的扩散性的情况下,考虑使用2个以上的扩散片的方法。 Further, in the case of improving the diffusion of the diffusion sheet, two or more methods consider the use of a diffusion sheet. 另外,根据透镜片的配光特性,也可以使用1个或者不使用透镜片。 Further, according to the light distribution characteristic of the lens sheet may be used without using a lens or sheet. 进而,也可以将保护片或偏光反射片组合在光学片组13上。 Further, the protective sheet or may be combined on a polarized light reflecting sheet 13 optical sheet group. 另外,光学片组13的构造最好鉴于所要求的亮度或配光特性等而成为最佳的片构造。 Further, the configuration of the optical sheet 13 is preferably set in view of brightness or light distribution characteristics required for the sheet to become the best configuration.

其次,虽然图1和图2中没有示出,但是在面状光源装置上配置有显示面板。 Secondly, although not shown in FIG. 2 and FIG. 1, the display panel is disposed on the planar light source device. 该显示面板考虑为应用液晶的双折射性的液晶显示面板、或在透明板上印刷了字符或图案的显示面板等。 The display panel is considered as the display panel of birefringent liquid crystal application liquid crystal, a transparent plate or printed characters or patterns or the like display panel. 本实施方式在下文对于显示面板使用液晶显示面板的显示装置的情况进行说明。 In the present embodiment below the display panel for a liquid crystal display panel of the display device of FIG.

这里,液晶显示面板由如下构成(图中未示出):在基板上形成有着色层、遮光层、对置电极等的对置基板;在基板上形成有成为开关元件的薄膜晶体管(以下也称为TFT)、像素电极等的TFT阵列基板;用于保持对置基板和TFT阵列基板的间隔的衬垫;用于贴合对置基板和TFT阵列基板的密封材料;在对置基板和TFT阵列基板之间夹持的液晶;注入液晶的注入口密封部件;使液晶定向的定向膜;以及偏光板。 Here, the liquid crystal display panel by the following configuration (not shown): the counter substrate a colored layer, a light shielding layer, the counter electrode or the like is formed on a substrate; forming on a substrate to become the switching element is a thin film transistor (hereinafter, also referred to as TFT), a pixel electrode of the TFT array substrate and the like; for holding the pad and the counter substrate of the TFT array substrate spaced apart; a sealing material bonding the TFT array substrate and the counter substrate; and the counter substrate and the TFT a liquid crystal sandwiched between the array substrate; a liquid crystal injection inlet sealing member; allowing the liquid crystal alignment film orientation; and a polarizing plate. 此外,在本发明中,由于使用现有的液晶显示面板,因而省略详细的说明。 In the present invention, since the conventional liquid crystal display panel, and thus the detailed description thereof will be omitted. 另外,在显示装置上具备用于驱动液晶显示面板的电路基板(图中未示出)。 Further, on the display device includes a circuit board for driving the liquid crystal display panel (not shown).

其次,在凹部6的底部设置有光量调整单元7。 Secondly, the amount of light provided at the bottom of the recessed portion 6 of the adjusting means 7. 图4示出放大导光板5的凹部6附近的截面图。 Figure 4 shows a sectional view of an enlarged vicinity of the recessed portion 6 of the light guide plate 5. 如图4所示的光量调整单元7由反射片20和扩散片21构成。 Light amount adjustment means shown in FIG. 47 is a reflective sheet 20 and the diffusion sheet 21. 反射片20可使用在PP(聚丙烯)或PET(聚对苯二甲酸乙二醇酯)中混合有硫酸钡或氧化钛的材料、或在树脂中形成有微细气泡的材料、在金属板上蒸镀有银的材料、在金属板上涂覆有包含氧化钛的涂料的材料。 The reflective sheet 20 may be used in the PP (polypropylene) or PET (polyethylene terephthalate) material mixed with barium sulfate or titanium oxide, or materials for forming fine air bubbles in the resin, the metal plate silver-vapor-deposited with a material with a coating material containing titanium oxide coating on a metal plate. 另外,本实施方式使用在PET树脂中形成有微细气泡的材料。 Further, the present embodiment is formed using a material of fine bubbles in the PET resin.

另一方面,扩散板21可使用PET(聚对苯二甲酸乙二醇酯)、PMMA(丙烯酸)或PC(聚碳酸酯)等树脂板或者玻璃基板这样的具有透光性质的材料。 On the other hand, the diffusion plate 21 may be used PET (polyethylene terephthalate), of PMMA (acrylic) or PC (polycarbonate) or the like or a resin plate such as a glass substrate material having light-transmitting properties. 另外,在上述材料中混入反射材料、或使表面粗面化,以使扩散板21具有使入射光散射的功能。 Further, a reflective material incorporated in the above-described materials, or to roughen the surface, so that the diffusion plate 21 having a function of diffusing incident light.

反射片20如上所述使用在PET树脂中形成有微细气泡的材料。 The reflective sheet 20 is formed using a material described above, fine bubbles of the PET resin. 使用该PET树脂的反射片20分别具有如图5所示的反射特性、如图6所示的透过特性。 PET resin using the reflection sheet 20 have the reflection characteristics shown in FIG. 5, the transmission characteristics shown in Figure 6. 另外,使用PET树脂的反射片20厚度厚则透过率减少,并且反射率增加。 Further, the thickness 20 of the PET resin using the reflecting sheet to reduce the transmittance, and the reflectance increases. 相反,使用PET树脂的反射片20厚度薄则透过率增加,并且反射率减少。 In contrast, the use of thin PET resin 20 in the reflective sheet is increased transmittance, and to reduce the reflectance.

本实施方式使用的反射片20使用具有如下透过特性的反射片20:如图6所示,入射到反射片20上的全光线(全部入射光)透过的比率即全光线透过率为2%以上。 The reflection sheet 20 of the present embodiment uses a reflection sheet having the following transmission characteristics of 20: 6, the ratio of the total light incident on the reflective sheet 20 (all of the incident light) through the total light transmittance, i.e., more than 2%. 当使用全光线透过率不满2%的反射片20时,则出现从LED光源4附近或正上方的射出面11射出的光减少,并且在射出面11产生亮度不均匀的情况。 When total light transmittance of 20:02% reflection sheet less than, the surface appears from the LED light source is emitted directly above or near to 11 4 emitted light decreases, and the unevenness of brightness in the exit surface 11. 因此,通过使用全光线透过率为2%以上的反射片20,能够调整入射到LED光源4附近或正上方的射出面11的直接光的光量,抑制从LED光源4附近或正上方的射出面11射出的光的减少,防止射出面11整体亮度不均匀。 Thus, by using a total light transmittance of 2% or more of the reflective sheet 20, it is possible to adjust the amount of direct light incident on the light exit surface 11 of the LED 4 or the vicinity immediately above the light source, light emitted upward from the inhibition of positive or near the LED light source 4 11 of the surface light emission is reduced, the overall brightness exit 11 to prevent uneven surface. 另外,通过使用全光线透过率为2%以上、优选4-6%的反射片20,能够抑制LED光源4附近的射出面11的亮度不均匀。 Further, by using a total light transmittance of not less than 2%, preferably 4-6% of the reflective sheet 20, it is possible to suppress luminance unevenness near the exit surface 4 of the LED light source 11. 而且,通过改变该反射片20的全光线透过率,能够调整入射到射出面11的直接光的光量,消除亮度不均匀。 Further, by varying the total light transmittance reflective sheet 20, it is possible to adjust the amount of light incident on the direct light exit surface 11, to eliminate brightness unevenness.

而且,通过反射片20具有将透过光作为扩散光在射出面11射出的扩散功能,能够进一步抑制LED光源4附近的射出面11的亮度不均匀。 Further, by the reflection sheet 20 has a diffused light as transmitted light 11 emitted from the emission surface diffusion function, it is possible to further suppress the uneven brightness near the exit surface 4 of the LED light source 11. 例如,通过使用反射片20,该反射片20使用在PET树脂中形成有微细气泡的材料,从而在反射片20处反射的光成为大致完全扩散光,透过的光也成为大致完全扩散光。 For example, by using the reflection sheet 20, the reflective sheet 20 is formed using a material having a fine bubbles in the PET resin, thus becoming substantially complete diffusion of light at the light reflected by the reflective sheet 20, light transmission is also substantially completely diffused light. 由于透过光是大致完全扩散光,不仅在LED光源4附近的一部分具有扩散效果,并且反射片20的整个面表现出同样的效果,因此能够抑制LED光源4附近的射出面11的亮度不均匀。 Since the light diffused through the light substantially completely, not only in the vicinity of the LED light source portion 4 has the effect of diffusion, and the entire surface of the reflection sheet 20 exhibits the same effects, emission luminance can be suppressed near the surface of the LED light source 4 unevenness 11 . 而且,由于即使LED光源4到射出面11之间的距离变短,也不易发生亮度不均匀,因此能够实现薄型的面状光源装置。 Further, even when the distance between the LED light source 4 to the exit surface 11 becomes shorter, uneven brightness is less likely to occur, it is possible to realize a thin planar light source device.

进而,在反射片20上,在LED光源4一侧印刷了吸收光的黑色的点图形,在LED光源4相反侧印刷了有色的点图形。 Further, on the reflection sheet 20, the side of the LED light source 4 a dot pattern is printed in black absorbing light at the opposite side of the LED light source 4 a colored dot pattern is printed. 另外,虽然点图形印刷是用黑色或有色墨在反射片20上印刷微细图形,但也可以以丝网印刷方式进行。 Further, although the dot pattern is printed on a fine pattern printed reflective sheet 20, but may be performed by screen printing with a black or colored ink. 而且,印刷的点图形的形状、大小、排列、浓淡、密度、颜色等最好鉴于面状显示装置的射出面的显示等级来进行最优化。 Further, the printed dot pattern shape, size, arrangement, gradation, density, color, etc. In view of the best emission surface level display device to display a planar optimized. 图7示出反射片20的印刷实例。 Figure 7 shows a printed example of a reflective sheet 20. 对于图7所示的反射片20来说,在LED光源4一侧印刷有均一排列的黑色点图形,而在LED光源4相反侧印刷有在中心部集中排列的有色点图形。 For the reflection sheet 720 shown in FIG, 4 at the printing side of the LED light source arranged in a uniform pattern with a black dot, while the opposite side of the printed LED light source 4 there is a colored dot pattern in the center portion of centralized arrangement. 与反射片20相同,也可以在扩散片21上实施黑色或有色印刷。 The same as the reflection sheet 20, a diffusion sheet may be a black or colored printing on the embodiment 21.

如图5和图6所示,反射片20吸收低波长光。 5 and 6, the reflective sheet 20 absorbs low wavelength light. 由此,通过反射片20的光成为带黄色的光,对于导光板5的射出面11来说,设置光量调整单元7的部分和除此以外的部分之间的颜色不同。 Thus, by the reflection sheet 20 becomes light yellowish light, for the exit surface 11 of the light guide plate 5, the light amount adjusting means is provided and a different color portion 7 between the other portions. 由此,在本实施方式中,特别地在反射片20的LED光源4相反侧实施有色印刷。 Thus, in the present embodiment, in particular in the LED light source 20 of the reflective sheet 4 opposite to the printed side of a colored embodiment. 由此,在本实施方式中,能够减轻导光板5的射出面11(壳体2的开口部1)的颜色不均匀。 Thus, in the present embodiment, the unevenness 11 can be reduced (the opening portion of the housing 1 of 2) color of the exit surface of the light guide plate 5.

而且,虽然如图4所示的扩散片21由1个构成,但是也能够由多个构成。 Further, although the diffusion sheet shown in FIG. 21 is constituted by one, but can also be constituted by a plurality. 通过使用多个扩散片21,能够进一步扩散光,并且能够改善导光板5的射出面11(壳体2的开口部1)的显示等级。 By using a plurality of diffusion sheets 21 can be further diffused light, and 11 can be improved (the opening portion 2 of the housing 1) of the display level of the light guide plate exit surface 5. 另外,在只通过反射片20能够充分确保导光板5的射出面11(壳体2的开口部1)的显示等级的情况下,也可以不设置扩散片21。 Further, only by the reflection sheet 20 can sufficiently ensure the guide plate exit surface 115 of the case where the display level (the opening portion 2 of the housing 1), the diffusion sheet 21 may not be provided.

而且,虽然如图4所示的反射片20由1个构成,但是也能够由多个构成。 Furthermore, although the reflecting sheet shown in FIG. 20 is composed of one, but can also be constituted by a plurality. 在该情况下,也可以组合厚度或种类不同的反射片20。 In this case, the thickness may be combined or the reflection sheet 20 of different types. 而且,在使用多个反射片20的情况下,是否在每个反射片20上都实施印刷点图形,鉴于导光板5的射出面11(壳体2的开口部1)的显示等级进行最优化。 Further, in the case where a plurality of the reflection sheet 20, whether the print dot pattern are implemented on each of the reflective sheet 20, in view of the level display 11 (the opening portion 2 of the housing 1) of the exit surface of the light guide plate 5 can be optimized .

接着,将对从LED光源4发出的光从导光板5的射出面11射出并且直至入射到液晶显示面板的路径进行说明。 Subsequently, the light will be emitted from the LED light source 4 is emitted from the emission surface 11 enters the light guide plate 5 and up the path to the liquid crystal display panel will be described. 首先,从LED光源4发出的光如图4所示直接或者由光量调整单元7反射而入射到导光板5。 First, the light emitted from the LED light source 4 shown in FIG. 4 directly or by the light amount adjustment unit 7 and enters the reflection light guide plate 5. 该直接或者由光量调整单元7反射而入射到导光板5的光(α1、α2)一边在导光板5和空气层的边界反复全反射一边在导光板5的内部传播。 The adjustment means directly or by the amount of light incident on the light guide plate 7 reflection (α1, α2) propagates while repeating total reflection inside the light guide plate 5 side at the boundary of the light guide plate 5 and the air layer 5. 如此,在导光板5内部传播的光由在导光板5的射出面相反面9实施的点印刷22(图4)扩散反射而改变光的传播方向。 Thus, propagating inside the light guide plate 5 and the diffuse reflection of light to change the direction of propagation of the print 22 (FIG. 4) by a light guide plate exit surface 5 opposite point 9 embodiment. 通过该光的传播方向的变化,使不满足对导光板5和空气层的边界的临界角的光从导光板5的射出面11射出。 By changing the direction of propagation of the light, the light does not satisfy the boundary of the light guide plate and the air layer 5 of the critical angle of light emitted from the emission surface 11 of the guide plate 5.

另外,虽然不满足对导光板5和空气层的边界的临界角的光也从导光板5的射出面11以外射出,但该光由在壳体2设置的反射片10(图2)反射,并且再次入射到导光板5。 Further, although the light does not satisfy the boundary of the critical light guide plate 5 and the air layer outside corners also emitted from the light guide exit surface 115, but the light by the reflection sheet 2 is provided in the housing 10 (FIG. 2) reflection, 5 and is incident again to the light guide plate. 而且,最终该光也从导光板5的射出面11射出。 Further, the light can eventually exit from the exit surface 5 of the light guide plate 11.

在本实施方式中,虽然导光板5的形状为板状,但本发明不限于此,导光板5的形状也可以为随着远离LED光源4而板厚变薄的楔形形状。 In the present embodiment, although the shape of the light guide plate 5 is a plate-like, but the present invention is not limited thereto, the shape of the light guide plate 5 may be as the distance from the LED light source 4 and a thickness thinner wedge shape. 通过使导光板5为该形状,能够有效地将传播的光导向射出面11。 By the light guide plate 5 for the shape, the light guide can be efficiently propagated exit surface 11. 由此,由于由在导光板5的侧面8设置的反射片10反射的光量减少,因此能够减少侧面8的反射片10产生的反射损失,增加射出面11的射出量。 Thus, due to the reduction in the amount of light reflected by the reflective sheet 10 side surface of the light guide plate 5 8 provided, it is possible to reduce the reflection loss of the side surface 8 of the sheet 10 is produced, increasing the amount of emission of the emission surface 11.

而且,从LED光源4通过反射片20的光(β)由扩散片21扩散而从凹部6的底部入射到导光板5。 Further, the light reflective sheet through 4 (β) 20 is diffused by the diffusion sheet LED light source 21 enters from the bottom of the concave portion 6 to the light guide plate 5. 由于入射到导光板5的光最终从导光板5的射出面11射出,因此光的利用率提高。 Since the light incident on the light guide plate 5 to the final exit from the exit surface 5 of the light guide plate 11, and therefore the light use efficiency is improved.

由于与从LED光源4直接入射到导光板5的光(α1)相比,由反射片20反射而入射到导光板5的光(α2),其朝向导光板5的入射角多为接近钝角的角度,因此容易从LED光源4附近的射出面11射出。 Since the light (alpha] 2) as compared with the light guide plate 5 from LED light source 4 is incident directly on the light (alpha] l) of the light guide plate 5, a reflector 20 enters the reflection sheet, the incident angle of the light guide plate 5 toward the close more obtuse angle, it is easy to exit from the exit surface 4 near the LED light source 11. 由此,在反射片20的LED光源4一侧的面实施黑色的点图形印刷,通过使该黑色的点图形吸收光而减少反射光,能够减少从LED光源4附近的射出面11射出的光,抑制LED光源4附近的射出面11的亮度不均匀。 Thus, the black dot pattern print surface embodiment of the LED light source 4 side of the reflective sheet 20, the black dot pattern by light absorption of the reflected light is reduced, it is possible to reduce the light emitted from the exit surface of the LED light source 11 near 4 is, the luminance near the exit surface 4 of the LED light source 11 is uniform.

而且,本实施方式的面状光源装置为了校正射出面11中的LED光源4的亮度变化,而在反射片20的LED光源4一侧的面实施黑色的点图形印刷。 Further, the planar light source device of the present embodiment for correcting emission luminance variation in a surface 4 of the LED light source. 11, in the LED light source 4 side of the reflection sheet 20 faces embodiment black dot pattern printing. 因此,本实施方式的面状光源装置能够抑制射出面11的亮度不均匀。 Thus, the surface light source device according to the present embodiment can suppress luminance unevenness emission surface 11.

这里,如图6所示,通过反射片20的光被吸收了短波长侧的光。 Here, as shown in Figure 6, the light is absorbed by the short wavelength side of the light reflecting sheet 20. 由此,在使用反射片20的面状光源装置中,长波长侧的光也即红色成分变多并且产生颜色不均匀。 Accordingly, the planar light source device using a reflection sheet 20, light of a long wavelength side, i.e., the red components are increased and the color unevenness.

然而,在本实施方式的面状光源装置中,在反射片20的LED光源4相反侧的面上印刷有消除由通过反射片20引起的光的色调变化这样的补色(例如蓝色)。 However, the planar light source device of the present embodiment, the printed surface of the reflective sheet 4 opposite to the side of the LED light source 20 has to eliminate such variation in hue and light reflecting sheet 20 caused by the complementary color (e.g. blue). 因此,在本实施方式的面状光源装置中,通过能够抑制由设置了反射片20的光量调整单元7引起的颜色不均匀。 Thus, the planar light source device of the present embodiment, the color unevenness can be suppressed by the light amount adjustment unit is provided in the reflection sheet 20 due 7.

另外,在本实施方式的光量调整单元7中,分别隔空气层配置有反射片20、扩散片21和导光板5。 Further, in the present embodiment, the light amount adjustment unit 7, each air layer 20 disposed on the reflection sheet, a diffusion sheet 21 and the light guide plate 5. 但是,通过在各片上设置粘着材料等,贴合各个片,能够不介有空气层地配置反射片20、扩散片21和导光板5。 However, by providing an adhesive material on the sheets, each sheet bonded, via an air layer can not be arranged in the reflection sheet 20, a diffusion sheet 21 and the light guide plate 5. 通过不介有空气层,就能够消除在空气层的界面处产生的表面反射,并且能够使从导光板5的射出面11射出的光量增加,使面状光源装置的光利用率提高。 By not via an air layer, it is possible to eliminate the surface reflection generated at the interface of the air layer, and capable of increasing the amount of light emitted from the exit surface 5 of the light guide plate 11, the light utilization planar light source device is improved. 而且,通过在导光板5的凹部6的底部固定光量调整单元7,能够提高面状光源装置的光利用率,并且具有防止由振动或冲击等引起的光量调节单元7活动的效果。 Further, by fixing the light amount adjusting unit light guide plate 5 of the bottom of the recess 6 of 7, the light utilization efficiency can be improved planar light source device, and having a regulating effect of preventing the amount of light and the like due to vibration or impact unit 7 activity.

但是,各片使用的粘着材料等最好为透过率95%以上的材料。 However, the adhesive material or the like is preferably used for each sheet of 95% or more transmittance of a material. 而且,粘着材料等与反射片20、扩散片21和导光板5的折射率大致相同。 Further, the adhesive material 20 and the reflection sheet, a diffusion sheet 5 and the refractive index of the light guide plate 21 is substantially the same. 由此,能够减少在反射片20、扩散片21和导光板5与粘着材料的界面处的镜面反射。 Accordingly, it is possible to reduce the 20, 21 and the specular reflection at the interface of the light guide plate 5 and the adhesive sheet material diffusion reflection sheet. 而且,反射片20、扩散片21和导光板5之间虽然由粘着材料全面紧贴,但也可以一部分紧贴。 Further, a reflection sheet 20, a diffusion sheet 21 and between the light guide plate 5 by the adhesive material while fully close, but may be close to the part. 而且,虽然由粘着材料紧贴整个片,但也可以由粘着材料只紧贴一部分片。 Further, although the entire sheet against the adhesive material, it may be only a portion of the sheet against the adhesive material.

而且,在本实施方式中,虽然凹部6的平面形状为底部(设置光量调节单元7的部分)和边缘部(插入LED光源4的部分)相同的形状,但本发明不限于此,也可以调整平面形状,以便导光板5的射出面11的显示等级最佳。 Further, in the present embodiment, although the planar shape of the concave portion 6 of the bottom (a light amount adjustment portion unit 7) and the edge portion (the insertion LED light source section 4) of the same shape, but the present invention is not limited thereto, may be adjusted planar shape, the light guide plate so as to display optimal emission level 11 of the surface 5.

进而,本发明的面状光源装置也可以对导光板5的射出面11或射出面相反面9实施镜面处理、粗面化处理、点图形印刷或有色印刷等。 Further, the surface light source device according to the present invention may be the opposite surface of the light guide plate 11 or the exit surface of the exit 5 of the embodiment 9 mirror processing, surface roughening treatment, a printed dot pattern or a colored printing. 通过在导光板5的射出面11或射出面相反面9上实施粗面化处理而形成褶皱面,能够进一步提高在导光板5的射出面11处的显示等级。 Wrinkle surface is formed by the exit surface of the light guide plate 5 on the back surface 11 or the exit surface roughening treatment embodiment 9, the display level can be further improved at the exit surface 11 of the guide plate 5.

而且,在本实施方式中,虽然在反射片20上实施有色印刷,但通过代替该有色印刷而在反射片20的LED光源4相反侧的面上配置颜色变换片,也能够得到同样的效果。 Further, in the present embodiment, although the embodiment of the colored reflecting printed sheet 20, but instead of this colored by printing a color conversion sheet disposed on the opposite surface side of the reflecting sheet 4 LED light source 20, the same effect can be obtained. 另外,该颜色变换片为仅使特定波长的光透过的片,例如,有透明薄纸状的带色玻璃纸等。 Further, the color conversion sheet is only a specific wavelength of light transmitted through the sheet, e.g., tissue-like transparent colored cellophane. 而且,通过使用与长波长侧的透过率相比短波长侧的透过率高的颜色变换片,从而具有能够减轻由通过上述反射片20而引起的着色的效果。 Further, by the short wavelength side compared to the transmittance of the long wavelength side using a high transmittance of the color conversion sheet, so as to have a coloring effect can be reduced by the reflection sheet 20 is caused.

进而,本实施方式的面状光源装置能够在导光板5上配置的光学片组13上增加选择性反射片。 Further, the optical sheet group planar light source device of the present embodiment can be arranged on the light guide plate 5 on the selective reflection plate 13 increases. 通过在光学片组13的导光板5侧设置选择性反射片,能够由选择性反射片反射从射出面11射出的光的一部分并使其向光量调节单元7返回,从而能够增加到达光量调节单元7的光,并且有效地减少亮度不均匀或颜色不均匀。 By providing selective reflection sheet in the optical sheets of the light guide plate 513 side, and it can be adjusted by the selective reflection plate 11 is reflected from a portion of the emitted light exit plane to the light quantity return means 7, thereby increasing the amount of light reaching adjustment unit 7 light and effectively reduce the brightness unevenness or color unevenness.

另外,该选择性反射片为具有提升亮度的效果的片。 Further, the selective reflection sheet is a sheet having a brightness enhancement effect. 作为选择性反射片,例如有棱镜片或反射型偏光片等,该棱镜片具有使大致垂直入射的光经由两次全反射向光量调节单元7侧返回的棱镜形状,该反射型偏光片利用具有偏光性能的片根据入射光的偏振方向分离为反射光和透过光。 As selective reflection sheet, for example, a prism sheet or a reflection type polarizing plate, etc., the prism sheet has a prism shape substantially perpendicular to the incident light adjusting unit 7 returns to the side of the light amount totally reflected twice by the use of a reflection type polarizer having the sheet is separated into polarization performance reflected light and transmitted light depending on the polarization direction of incident light.

本实施方式的显示装置构成为从面状光源装置的导光板5的射出面11(壳体2的开口部1)射出的光通过扩散板12和光学片组13并且入射到液晶显示面板。 The display device according to the present embodiment is composed of the display panel from the light guide light source device emits planar surface 11 (the opening portion of the housing 2 1) 5 emitted by a light diffusion plate 12 and the optical sheet group 13 and is incident to the liquid crystal. 液晶显示面板通过由未图示的开关元件实现的电压的接通或断开而改变液晶层的定向,入射到液晶显示面板的光与图像信号相匹配地进行调制,显示为红色(R)、绿色(G)或蓝色(B)。 Changing the orientation of the liquid crystal display panel through the liquid crystal layer (not shown) implemented by a voltage switching element is turned ON or OFF, incident light to the liquid crystal display panel with the image signal modulated in matching, shown in red (R), green (G) or blue (B).

另外,在发出红色(R)、绿色(G)或蓝色(B)的单色光的LED作为光源使用的情况下,发光光谱的半值宽度窄,红色(R)、绿色(G)、蓝色(B)以外的发光光谱很少。 Further, the emitting red (R), green (G) or blue (B) monochromatic light of an LED used as a light source, the light emission spectrum narrower half-value width, the red (R), green (G), emission spectra other than blue (B) little. 如此,与光源使用具有红色(R)、绿色(G)或蓝色(B)以外的发光光谱的冷阴极管的情况相比,使用发单色光的LED作为光源的情况具有通过在反射片20处吸收短波长侧而引起的色度变化量变大的倾向。 Thus, the light source having a red (R), where an emission spectrum of a cold cathode tube green (G) or blue (B) other than the comparison, made using monochromatic LED as a light source having a reflective sheet by 20 at a large amount tends to absorb change in chromaticity caused by the short wavelength side. 从而,在光源使用冷阴极管的情况下不太被看出的颜色不均匀在光源使用发单色光的LED的情况下容易被看出。 Accordingly, in a case where a cold cathode tube light source using less color unevenness to be seen easily seen in a case where monochromatic light source made of LED. 本实施方式的面状光源装置通过如上所述在反射片20上实施有色印刷从而消除上述颜色不均匀。 The planar light source device of the present embodiment as described above in the embodiment of the colored printing on the reflective sheet 20 so as to eliminate the above-described color unevenness.

而且,本实施方式虽然说明了使用1个LED光源4的情况,但本发明不限于此,在需要亮度的情况或开口部1的尺寸大的情况下能够使用多个LED光源4。 Further, the present embodiment has been described the case of using an LED light source 4, but the present invention is not limited thereto, can be used in a large size or a case where the opening portion of the case requires a plurality of LED light sources 4 luminance. 而且,LED光源4的位置不限定于壳体2的中央部分,能够根据射出面11的亮度分布而配置在最合适的位置。 Further, LED light position 4 is not limited to the central portion of the housing 2 can be arranged in the most suitable position according to the luminance distribution of the emission surface 11.

如上所述,本实施方式的面状光源装置由于在凹部6的底部设置了具有反射片20、扩散片21的光量调整单元7,因此具有能够消除亮度不均匀或颜色不均匀并且光的利用效率高且面内亮度均一性高的、能具有足够显示等级的效果。 As described above, the surface light source device according to the present embodiment, since the bottom of the recess 6 is provided with a reflective sheet 20, the diffusion sheet 21, the light amount adjustment unit 7, can be eliminated with efficiency and therefore luminance unevenness or color unevenness and light high brightness and high in-plane uniformity can be enough to show an effect level.

(实施方式2)图8示出本实施方式的面状光源装置的截面图。 Sectional view of the planar light source device (Embodiment 2) Figure 8 shows an embodiment according to the present embodiment. 在图8所示的面状光源装置中,导光板5具有:设置在与LED光源4对应的位置上并容纳LED光源4的一部分的圆柱形状的凹部6、以及在与设置凹部6的面相对的面上设置的圆柱形状的凹部30,还具备设置在凹部30的底部并调整来自LED光源4的光的光量调整单元7。 In the planar light source device shown in Figure 8, the light guide plate 5 is provided with: a concave portion at the position of the LED light source 4 corresponding to the upper and accommodating the LED light sources cylindrical shape portion 4 of the 6, and the surface with the concave portion 6 opposed shaped recessed portion 30 of the cylindrical surface is provided, further comprising a bottom portion provided in the recess 30 and to adjust the amount of light from the LED light source 4 adjusting unit 7. 也就是说,图8所示导光板5中,在射出面相反面9一侧将凹部6设置成和射出面11侧的凹部30背对背。 That is, the light guide plate 5 as shown in FIG. 8, 9 at the opposite side of the emission surface 6 of the concave portion 30 disposed back to back and the recess portion of the exit surface 11 side. 进而,虽然光量调节单元7在实施方式1中设置在射出面相反面9一侧的凹部6的底部,但本实施方式中设置在射出面11侧的凹部30的底部。 Further, although the light amount adjustment unit 7 in Embodiment 1 is provided on the exit surface opposite the bottom side 9 of the recess 6, the present embodiment is provided at the bottom portion 11 side of the emission surface of the concave portion 30.

另外,除在实施方式1的构造中设置凹部30,在该凹部30处配置光量调节单元7以外,本实施方式的面状光源装置与实施方式1为相同构造。 Further, in addition to the configuration of Embodiment 1 is provided in the recess portion 30 is disposed outside the light amount adjustment unit 7 of the recessed portion 30, the planar light source device of Embodiment 1 of the present embodiment is the same structure. 如此,图8所示的面状光源装置对与图2所示的面状光源装置相同的构造元件给出相同的符号,并且省略了说明。 Thus, the planar light source device shown in FIG. 8 are given the same reference numerals and the same surface light source device configuration shown in FIG. 2 elements, and the explanation is omitted. 而且,除以下说明的本实施方式的面状光源装置特有的作用效果以外,与实施方式1的面状光源装置起到相同的作用效果。 Further, in addition to a planar light source according to the present embodiment described below, the device-specific effects, with the planar light source device according to Embodiment 1 of the same functions and effects.

本实施方式的面状光源装置通过在导光板5的射出面11侧配置凹部30,在组装面状光源装置时,能够在壳体2和LED光源4上载放导光板5以后配置光量调节单元7。 The planar light source device according to the present embodiment is disposed a light amount adjustment unit 7 after 5 by arranging the recess 30 at the 11-side exit surface of the light guide plate 5, when assembling the planar light source device capable of placing the light guide plate on the housing 2 and the LED light source 4 . 如此,组装面状光源装置以后,不取出导光板就能够更换光量调节单元7,提高组装性能。 Thus, after assembling the planar light source device, the light guide plate can be replaced without taking the light amount adjustment unit 7, to improve assembling performance.

而且,由于通过在凹部30的底部实施点图形印刷或褶皱形状处理,使从LED光源4射出的光进一步扩散,所以能够减轻导光板5的射出面11的亮度不均匀或颜色不均匀并且能够提高显示等级。 Further, since the dot pattern in the embodiment the shape of the bottom pleat print processing recess 30, so that further diffusion of the light emitted from the LED light source 4, it is possible to reduce brightness unevenness emission surface 11 of the light guide plate 5 or the color unevenness and to improve display classes.

进而,由于通过在凹部30的底部粘贴光量调节单元7,减轻了由凹部30的底部和光量调节单元7的界面的空气层引起的表面反射,所以导光板5的射出面11处的亮度上升。 Furthermore, since by attaching the bottom of the concave portion 30 of the light amount adjustment unit 7, reducing the surface of the reflective layer of air caused by the interface unit 7 is adjusted by the bottom and the light amount of the recess 30, the luminance at the exit surface 5 of the 11 light guide plate increase.

而且,凹部30的平面形状与凹部6的平面形状相同,也可以为相似形状。 Further, the planar shape of the concave portion 30 is the same as the planar shape of the recessed portion 6, may be a similar shape. 进而,凹部30的平面形状也可以与凹部6的平面形状不同。 Further, the planar shape of the concave portion 30 may be different from the shape of the recess 6 is planar. 进而,凹部30的深度也能够比光量调节单元7的厚度深。 Further, the depth of the concave portion 30 can also adjust the thickness of the cell 7 is deeper than the light amount. 而且,凹部30的侧面也可以为褶皱形状。 Further, the side surface recess 30 may be a pleated shape. 另外,凹部30的平面形状和深度最好鉴于导光板5的射出面11的显示等级进行最优化。 Further, the planar shape and depth of the recess 30 is preferably in view of the emission level of the display surface 11 of the light guide plate 5 can be optimized.

其次,光量调节单元7的平面形状虽然基本上与凹部30的平面形状相同,但也能够以相似形状地变小。 Secondly, the planar shape of the light amount adjustment unit 7 is substantially the same, although the planar shape of the recess 30, but can also be a similar shape becomes smaller. 而且,光量调节单元7的平面形状如果是能够在凹部30的底部设置的大小,则也可以是与凹部30的平面形状不同的形状。 Further, the planar shape of the light quantity adjusting unit 7 if it is possible to set the size of the bottom of the recess 30, it may be a plane shape of the recess 30 of different shape. 另外,光量调节单元7的平面形状最好鉴于导光板5的射出面11的显示等级进行最优化。 Further, the planar shape of the light amount adjusting means 7 is preferably in view of the display surface of the light guide plate 5 of the emission level 11 can be optimized.

而且,为了光量调节单元7的定位,也可以在导光板5的射出面11粘贴未图示的透明片。 Further, the light amount adjustment to the positioning unit 7, the transparent sheet may be attached on the exit surface 11 of the light guide plate 5 (not shown). 该透明片最好透过率为95%以上。 The transmittance of the transparent sheet is preferably 95% or more.

(实施方式3)图9示出本实施方式的光量调节单元7所使用的反射片20的概略图。 The amount of light (Embodiment 3) Figure 9 shows the embodiment of the present embodiment adjustment unit 7 reflective sheet used in the schematic of FIG. 20. 图9所示的反射片20为在实施方式1说明的反射片20的材料上开有多个孔40的形状。 FIG reflective sheet 920 is shown on the material of the reflection sheet 20 of Embodiment 1 has a shape of a plurality of open holes 40. 另外,本实施方式的面状光源装置除在光量调节单元7中使用图9所示的反射片20以外,与实施方式1和2相同。 Further, with the embodiment, and the same planar light source device of the present embodiment other than the light amount adjustment unit shown in FIG. 97 using a reflective sheet 2012. 如此,对于图9所示的反射片20以外的构成要素省略说明。 Thus, components other than the reflection sheet 20 shown in Fig omitted. 而且,除以下说明的本实施方式的面状光源装置特有的作用效果以外,与实施方式1的面状光源装置起到相同的作用效果。 Further, in addition to a planar light source according to the present embodiment described below, the device-specific effects, with the planar light source device according to Embodiment 1 of the same functions and effects.

图9所示的反射片20的材料与实施方式1说明的相同,使用在PP(聚丙烯)或PET(聚对苯二甲酸乙二醇酯)中混合有硫酸钡或氧化钛的材料、或在树脂中形成有微细气泡的材料、在金属板上蒸镀有银的材料、在金属板上涂覆有包含氧化钛的涂料的材料。 The same as shown in FIG. 9 reflective sheet material 20 of Embodiment 1 explained in PP (polypropylene) or PET (polyethylene terephthalate) material mixed with barium sulfate or titanium oxide, or fine bubbles are formed with a material in a resin, a metal plate material with a silver-vapor-deposited, with a material containing titanium oxide coating on a metal-coated plate. 另外,反射片20的反射率最好为90%以上。 Further, reflectance of the reflection sheet 20 is preferably 90% or more. 而且,由于通过重叠多个反射片20而能够提高反射率,因此具有提升射出面11的亮度的效果。 Further, since the reflectivity 20 can be improved by superimposing a plurality of the reflection sheet, thus having a surface 11 to enhance the emission luminance of the effect.

虽然本实施方式在反射片20上设置多个孔40,但通过该孔40的大小、数量、排列、形状,能够任意调整反射片20的反射率或透过率。 40, but by the aperture size, number, arrangement, shape 40 can be arbitrarily adjusted reflectance or transmittance of the reflection sheet 20 of the present embodiment, although a plurality of holes provided on the reflective sheet 20. 如此,与通过在反射片20上实施印刷而调整反射率或透过率的情况相比,设置多个孔40的反射片20没有印刷的紧贴或墨水的劣化等引起的不便,因此可靠性高。 Thus, in the case where the reflective sheet 20 by printing is adjusted reflectance or transmittance as compared with a plurality of holes provided in the reflection sheet 20 without the inconvenience caused by the printed ink against deterioration or 40, the reliability high. 从而,使用设置多个孔40的反射片20的面状光源装置成为随时间变化少的面状光源装置。 Thus, using planar light source device provided a plurality of apertures 40 of the reflection sheet 20 becomes smaller over time variation planar light source device.

(实施方式4)图10示出本实施方式的导光板5和反射片20的概略正面图(图10(a))和截面图(图10(b))。 The light guide plate and a reflection sheet 5 (Embodiment 4) FIG. 10 shows an embodiment according to the present embodiment is a schematic front view (FIG. 10 (A)) and a sectional view (FIG. 10 (b)) 20 of. 实施方式1虽然使用全光线透过率为2%以上的反射片20,但根据各种条件可以控制反射片20的全光线透过率的值。 Embodiment 1 although the reflective sheet total light transmittance of 20 2% or more, depending on various conditions but can control the reflective sheet 20, the value of total light transmittance. 本实施方式使用具有满足式1的全光线透过率值的反射片20。 Embodiment of the present embodiment having a total light transmittance value of a reflective sheet satisfies the formula 120. 另外,除以下说明的本实施方式的面状光源装置特有的效果以外,与实施方式1的面状光源装置起到相同的作用效果。 Further, in addition to a planar light source according to the present embodiment described below, device-specific effect functions and the same effects as the planar light source device according to Embodiment 1. FIG. 而且,本实施方式的面状光源装置除图10所示的导光板5和反射片20以外的构造均与实施方式1的构造相同。 Further, the planar light source device constructed according to the present embodiment, in addition to the light guide plate 5 and the reflective sheet 20 shown in FIG. 10 are the same as the configuration of Embodiment 1 of the embodiment.

图10中,设反射片20的平均半径为r,从LED光源4到反射片20的距离为H,LED光源4的发光面积为S,LED光源4的总光量为L,反射片20的全光线透过率为t。 10, is provided the reflective sheet average radius 20 is r, from the LED light source 4 to the reflecting plate distance 20 is H, LED light emitting area 4 is S, the LED light source the total light quantity of 4 L, the reflection sheet full 20 light transmittance as t. 首先,从LED光源4的正上部到反射片20的端部所成的角度为θ=tan-1(r/H),入射到反射片20的光量L1表示为L1=(1-cosθ)L。 First, just above the LED light source 4 to the reflecting sheet end 20 of an angle of θ = tan-1 (r / H), amount of light incident reflection sheet 20 is L1 is expressed as L1 = (1-cosθ) L . 而且,除反射片20以外入射到导光板5上的光量L2表示为L2=Lcosθ。 Further, in addition to the reflection sheet 20 amount of light incident on the light guide plate 5 L2 is expressed as L2 = Lcosθ.

由于反射片20的面积为S1=πr2,所以反射片20的每单位面积的射出光量B1表示为t×(1-cosθ)L/πr2。 Since the area of ​​the reflecting plate 20 is S1 = πr2, the reflection sheet per unit area of ​​the light emission amount Bl 20 is represented as t × (1-cosθ) L / πr2. 而且,由于反射片20以外的射出面的面积S2=S-πr2,因此反射片20以外的射出面的每单位面积的射出光量B2表示为Lcosθ/(S-πr2)。 Further, since the area other than the exit surface of the reflective sheet 20 S2 = S-πr2, therefore per unit area than the exit surface of the reflective sheet 20 B2 is expressed as the amount of light emitted Lcosθ / (S-πr2). 从而,为了抑制面状光源装置的亮度不均匀,射出光量B1和射出光量B2需要具有B1≥B2的关系。 Thus, in order to suppress luminance unevenness planar light source device, the light emission amount and the light emission amount B1 B2 B1≥B2 required to have a relationship. 根据该关系,反射片20的全光线透过率的值t能够按式1求出。 According to this relationship, the reflective sheet total light transmittance values ​​of t 20 can be obtained according to formula 1.

(式1)t&GreaterEqual;&pi;r2cos&theta;(1-cos&theta;)(S-&pi;r2)]]>本实施方式的面状光源装置通过使用满足式1的反射片20,通过调节入射到LED光源4附近或正上方的射出面11的直接光的光量,从而能够防止射出面11整体的亮度不均匀。 (Formula 1) t & GreaterEqual; & pi; r2cos & theta; (1-cos theta &;) (S- & pi; r2)]]> planar light source device of the present embodiment by satisfying the reflector sheet 20 of, by adjusting the incident LED light source 4 emitted light amount of the direct light or near the surface 11 immediately above, thereby preventing the entire brightness unevenness emission surface 11.

Claims (19)

  1. 1.一种面状光源装置,其特征在于,具备:至少在一面上具有开口部的壳体;在与所述开口部相对的所述壳体的一面上保持的光源;以及在覆盖所述开口部和所述光源的位置处配置的导光板,所述导光板具备:设置在与所述光源相对应的位置处并容纳所述光源的一部分的凹部;以及设置在所述凹部的底部并调整来自所述光源的光的光量调整单元,所述光量调整单元具备反射片,该反射片在设平均半径为r、离所述光源的距离为H、所述光源的发光面积为S、所述光源的总光量为L的情况下,具有反射来自所述光源的光的反射功能、以及全光线透过率t满足t≥πr2cosθ/{(1-cosθ)(S-πr2)}关系的透过功能。 1. A planar light source device comprising: at least one side of the housing having an opening portion; a light source on one side of the holding portion of the housing opposite to the opening; and a cover an opening portion of the light guide plate and the light source arranged at a position, the light guide plate comprising: a recess portion provided at a portion of the light source at a position corresponding to and receiving the light source; and provided at the bottom of the recess, and adjusting the light from the light source of the light amount adjusting means, said light amount adjusting means includes a reflective sheet, the reflective sheet disposed average radius r, the distance from the light source is H, the light source is a light emitting area S, the the total light amount of said light source is the case L, has the function of reflected light from the light source, and the total light transmittance t satisfies t≥πr2cosθ / {(1-cosθ) (S-πr2)} permeable relationship over function.
  2. 2.一种面状光源装置,其特征在于,具备:至少在一面上具有开口部的壳体;在与所述开口部相对的所述壳体的一面上保持的光源;以及在覆盖所述开口部和所述光源的位置处配置的导光板,所述导光板具备:设置在与所述光源相对应的位置处并容纳所述光源的一部分的凹部;以及设置在所述凹部的底部并调整来自所述光源的光的光量调整单元,所述光量调整单元具备反射片,该反射片具有反射来自所述光源的光的反射功能和全光线透过率为2%以上的透过功能。 A planar light source device, comprising: at least one side of the housing having an opening portion; and a light source on one side of the holding portion of the housing opposite the opening; and a cover an opening portion of the light guide plate and the light source arranged at a position, the light guide plate comprising: a recess portion provided at a portion of the light source at a position corresponding to and receiving the light source; and provided at the bottom of the recess, and adjusting the light from the light source light quantity adjusting means, the light amount adjusting means includes a reflection sheet, the reflector reflecting light from the light source having a reflective function and a total light transmittance of 2% or more permeation function.
  3. 3.一种面状光源装置,其特征在于,具备:至少在一面上具有开口部的壳体;在与所述开口部相对的所述壳体的一面上保持的光源;以及在覆盖所述开口部和所述光源的位置处配置的导光板,所述导光板具有:设置在与所述光源相对应的位置处并容纳所述光源的一部分的第一凹部;以及与所述第一凹部背对背设置的第二凹部,还具备:设置在所述第二凹部的底部并调整来自所述光源的光的光量调整单元。 A planar light source device, comprising: at least one side of the housing having an opening portion; and a light source on one side of the holding portion of the housing opposite the opening; and a cover arranged at the position of the opening portion of the light source and a light guide plate having: a first recess portion provided at a portion of the light source at a position corresponding to and receiving the light source; and with the first recess a second recess portion disposed back to back, further comprising: a second recess provided at the bottom portion of the light from the light source and adjusting the light amount adjusting means.
  4. 4.如权利要求3所述的面状光源装置,其特征在于,所述光量调整单元具备反射来自所述光源的光的反射片。 4. The surface light source device according to claim 3, wherein said light quantity adjusting means includes a reflection plate reflecting light from the light source.
  5. 5.如权利要求4所述的面状光源装置,其特征在于,所述反射片具有反射来自所述光源的光的反射功能和全光线透过率为2%以上的透过功能。 5. The surface light source device according to claim 4, characterized in that, the reflective sheet having a function of reflecting reflected light from the light source and the total light transmittance of 2% or more permeation function.
  6. 6.如权利要求1、2、4、5中任一项所述的面状光源装置,其特征在于,所述反射片具有使透过的光扩散的扩散功能。 6. The planar light source device of any one of 1,2,4,5 claims, characterized in that, the reflective sheet having a light diffusion function of the diffusion transmission.
  7. 7.如权利要求1到5中任一项所述的面状光源装置,其特征在于,所述光量调整单元还具备使来自所述光源的光扩散的扩散片。 7. A planar light source device 1 to 5 according to any one of the preceding claims, characterized in that said light amount adjusting means further includes a diffusion sheet for diffusing light from the light source.
  8. 8.如权利要求1、2、4、5中任一项所述的面状光源装置,其特征在于,所述反射片在所述光源一侧的面上实施黑色印刷。 8. The surface light source device according to any one of the 1,2,4,5 claim, wherein said reflective black printing sheet embodiment of the light source side surface.
  9. 9.如权利要求1、2、4、5中任一项所述的面状光源装置,其特征在于,所述反射片在与所述光源相反侧的面上实施有色印刷。 9. A planar light source device of any one of 1,2,4,5 claims, characterized in that, the reflective sheet on a surface side opposite to the light source of the embodiment of the colored printing.
  10. 10.如权利要求7所述的面状光源装置,其特征在于,所述扩散片在所述光源一侧的面上实施黑色印刷。 10. The surface light source device according to claim 7, wherein said diffusion surface black printing sheet embodiment of the light source side.
  11. 11.如权利要求7所述的面状光源装置,其特征在于,所述扩散片在与所述光源相反侧的面上实施有色印刷。 11. The surface light source device according to claim 7, characterized in that, the diffusion sheet on a surface on the opposite side of the light source embodiment of the colored printing.
  12. 12.如权利要求9所述的面状光源装置,其特征在于,所述有色印刷为蓝色。 12. The planar light source device according to claim 9, wherein the print is colored blue.
  13. 13.如权利要求11所述的面状光源装置,其特征在于,所述有色印刷为蓝色。 13. The surface light source device according to claim 11, wherein said blue colored printing.
  14. 14.如权利要求8所述的面状光源装置,其特征在于,所述黑色印刷或所述有色印刷为点图形印刷。 14. The surface light source device according to claim 8, wherein said black colored printing the print dot pattern is printed.
  15. 15.如权利要求9所述的面状光源装置,其特征在于,所述黑色印刷或所述有色印刷为点图形印刷。 15. The planar light source device according to claim 9, wherein said black colored printing the print dot pattern is printed.
  16. 16.如权利要求1、2、4、5中任一项所述的面状光源装置,其特征在于,所述反射片具备多个孔。 16. The planar light source device of any one of 1,2,4,5 claims, characterized in that, the reflective sheet includes a plurality of holes.
  17. 17.如权利要求1到5中任一项所述的面状光源装置,其特征在于,所述光源为发光二极管。 17. The planar light source device 1 to 5 according to any one of the preceding claims, characterized in that the light source is a light emitting diode.
  18. 18.如权利要求1到5中任一项所述的面状光源装置,其特征在于,所述光源为白色发光二极管。 18. The planar light source device 1 to 5 according to any one of the preceding claims, characterized in that the light source is a white light emitting diode.
  19. 19.一种显示装置,其具备:面状光源装置和在所述面状光源装置的开口部上配置的显示面板,在所述面状光源装置中,其具备:至少在一面上具有所述开口部的壳体;在与所述开口部相对的所述壳体的一面上保持的光源;以及在覆盖所述开口部和所述光源的位置处配置的导光板,所述导光板具备:设置在与所述光源相对应的位置处并容纳所述光源的一部分的凹部;以及设置在所述凹部的底部并调整来自所述光源的光的光量调整单元,所述光量调整单元具备反射片,该反射片在设平均半径为r、离所述光源的距离为H、所述光源的发光面积为S、所述光源的总光量为L的情况下,具有反射来自所述光源的光的反射功能、以及全光线透过率t满足t≥πr2cosθ/{(1-cosθ)(S-πr2)}关系的透过功能。 19. A display device, comprising: the planar light source device and disposed on the opening portion of the planar light source device of a display panel, said planar light source device, comprising: at least on one side with the an opening portion of the housing; and a light source on one side of the holding portion of the housing opposite the opening; and a guide plate disposed at a position covering the opening portion and the light source, the light guide plate comprising: disposed at a position corresponding to the light source and the accommodating recess portion of the light source; and setting adjustment means at the bottom of the recess and the light from the light source to adjust the amount of light, the light amount adjusting means comprises a reflective sheet the reflection sheet is disposed average radius r, the distance from the light source is H, a light emitting area of ​​the light source is S, the total light amount of the light source is L, the reflected light from the light source having a reflection function, and the total light transmittance t satisfies t≥πr2cosθ / {(1-cosθ) (S-πr2)} through a functional relationship.
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WO2013131383A1 (en) * 2012-03-09 2013-09-12 京东方科技集团股份有限公司 Method and system for manufacturing reflection diaphragm
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CN102155676A (en) * 2010-01-07 2011-08-17 Lg伊诺特有限公司 Backlight unit, and display apparatus thereof
CN102155676B (en) * 2010-01-07 2015-11-25 Lg伊诺特有限公司 A backlight unit and a display device
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