1254176 玖、發明說明： [發明所屬之技術領域] 本發明係有關一種由發光二極體(LED)元件等之發光元件構 成之點光源的集合體所成，且主要用於液晶顯示面板之背光照明 等之面光源裝置。 [先前技術] 作為液晶顯示面板之背光用面光源，習知者有以透光性平板 為導光板之邊緣光（edg-light)方式者。於此等面光源，係自透明平 行平板或剖面楔子形平板所成的導光板之側端面（邊緣部）之—方 入射光，以傳播遍及導光板之全部區域，並使其傳播的光之一部 分在導光板背面之光反射構件成為擴散反射光，而自導光板正面 放出擴散光。 液晶顯示面板之光源所用的邊緣光方式之導光板，由於可將 導光板厚度變薄及簡化構成而廣受利用。 諸多邊緣光方式之面光源係採用冷陰極管燈為其光源，而將 冷陰極管燈裝於導光板之邊緣部。 另一方面，近年來因攜帶型裝置普及，而有其省電化之需要。 方、&作為攜π型裝置之背光光源，與習用之冷陰極管燈相較， 以耗電量少之LED元件為光源者受到矚目而見實用化。 第$圖為採用LED元件之面光源之概略剖面圖。如圖所示， 邊面光源係由導光板1，及LED所成之點光源2等所構成。 方、V光板1之邊緣部配置有多數由白色led晶片所構 311740 5 !254176 成之點光源2。 導光板1之垂直於點光源2之側，設有光反射面u，而相對 於光反射面11之側設有光出射面12。於是點光源2之光在光反射 面11及導純1之三個側面13....··反射，而大部分之入射光最後 將自光出射面12以具有均—定向性之合成光出射。又，於導光板 1之光出射面的上面配置有擴散片3、透鏡片4。 上述點光源2周圍之構造係反光罩22包圍安裝有各led之 基板21之構造，且可將點光源2之光引導至導光板卜 [發明内容] 之問題 但是’以LED元件為光源來使用時，需將數個咖晶片錫 蟬固裝於基板21上，而有光之反射效率將受基板^之表面狀態 影響之問題。例如，在基板21上固封電阻及二極體科，因其零 件之色調而有光被吸收，使光效率降低之問題。 又，固裝於基板21上之零件在左右方有誤差時，也會發生左 右輝度不均之問題。 又’反光罩22並非包住點光源2本體之構造，因而有易漏光， 光效率降低之問題。 本發明絲解決上述f用之_而成者，•供—種光效率 提升、輝度不均得以改善之面光源為目的。 解決問題之手段 311740 6 1254176 本發明為一種面光源裝置，係自配置於導光板側端面之一方 的多數點光源人射光，並在導光㈣面之光反射面，而由導光板 正面放出光之背光用面光源裝置’其特徵為，導光板之光反射面 配置有反射’此反射片在導光板之光人射面卿成圍繞前述多 數點光源之空間，且此反㈣設有供插人前述點統之插入口， 此插入口4有切σ ’而且係以—片反射片—體構成包圍前述光反 射面及前述多數點光源之空間。 别述反射片之插人口的數量可設成與點光源之數量相同，而 可插入點光源於其插入口。 又，係使用射出白色光之白 再者’使用射出單色光之單色LED作為點光源時，可於導另 板設置將單色LED的射出光變換為白色光之波長變換裝置。 依上逑構成’於採用點光源為液晶顯示面板之光源等之面光 源1置中’點光源為插人並安裝於插人口，因而點光源之間存在 有反射片。結果，可減少受固裝有點光源之基板之影響，並且因 反射片15繞光源而可減少漏光，提升光效率。 [實施方式] 以下參照®面說明本發明之實闕g。第丨圖為彻本發明 之面光源裝置之概略構成剖面圖，第2圖係、 片之狀態之斜視圖。在此，與習用的相同之部分附有:=射 °弟]圖及第2圖所示，本發明之面光源係由導光板卜由 LED所構成之點光源2.···‘.及各種控制電路（無圖示）所構成。於此 311740 7 1254176 控制電路包含有例如用以檢測自導光板1之光出射面12所出射之 光的總量，以調整並供給點光源2之電力使出射光量為最適當值 之電路。 V光板1之邊緣部分所設之光入射面la，相對向配置有白色 LED晶片所構成之點光源2……。於本實施形態，係於基板21上 固裝6件白色LED晶片作為點光源2··· ··.。該白色LED晶片，只 要使用例如將R、G、B三色之LED收容於1單位而構成可出射 白色光者，或使用螢光物質使LED之出射光變換為白色光以構成 單色LED者即可。例如，該螢光物質若採用GaN系藍色LED時， T 用 YAG (yttrium aluminium garnet)系螢光物質。 在導光板1之垂直於點光源2……之側設有光反射面u。此 光反射面11為了防止漏光並提高反射效率，而施有網點印刷或形 成有細粒狀（corn)凹處。 在導光板1之相對向於光反射面u之側設有光出射面12。 於是，自點光源2之各LED之祕在光反射面導光板m 個側面13反射’而大部分之人射光最後將以具有均-定向性之合 成光由光出射面口出射。 則速導光板1之材料係由透纽材料中選用，通常可用丙歸 酸樹脂或聚碳酸醋樹脂。導光板i之形狀為平行平板或剖面楔子 形平板，其厚度通常係使用約i至5聰者，使用led時較使用 冷陰極管燈時可更加薄型化。 311740 8 1254176 又’其他透光性材料可用如：聚甲基丙烯酸甲酯（p〇lymethyl methacrylate)、聚曱基丙烯酸(p〇lymethyl aery late)等之丙烯酸酯 (acrylic acid ester)或曱基丙烯酸酯（methacrylic acid ester)之單體 或共聚合體’聚對苯二甲二乙g旨（polyethylene terephthalate)、聚乙 烯二甲二乙酯（polybuthylene terephthalate)等之聚酯（p〇iyester)、聚 碳酸酉旨（polycarbonate)、聚苯乙烯(polystyrene)、聚甲基戍稀 (polymethyl pentene)等熱可塑性樹脂，或以紫外線或電子線交聯之 多官能胺曱酸乙酯丙稀酸（urethane acrylate)、聚黯丙稀酸 (polyester acrylate)等之丙稀酸(acrylate)、不飽和聚醋等透明樹 脂、透明玻璃、透明陶瓷等。 於此發明，設有除導光板1之光出射面12之外而包住導光板 1之反射片5。即反射片5配置成包住含導光板1之反射面η及3 個側面13之導光板1。而且，該反射片5與導光板1之光入射面 la側之間，設有反射片5圍繞之空間6。此反射片5與導光板1 係由雙面膠帶或黏著劑等之黏著層8所固定。 如第2圖所示，由反射片5圍繞之空間6之與導光板1相對 向處設有可插入LED之點光源2之插入口 7。又，於導光板1之 光反射面11的上面配置有擴散片3、透鏡片4。片材之構成係單 張或2張均可，又重疊順序相反亦可。 於是，安裝於基板21之點光源2......係分別相對於固定在導 光板1之反射片5所設的各插入口 7......’而由其插入口 7插入空 311740 9 1254176 間6内。然後’在位於導光板丨外側之無圖示之外框，將安裝有 各LED之基板21以螺絲或黏著劑固定，且可在導光板^之規定 位置配置點光源2...... 〇 點光源2.·..··之各LED光係進入導光板1之内部，並於設在 光反射面1丄之光反射圖樣及3個側端面反射而反覆聚光，而自導 光板1之光出射面i2向擴散板3出射，且藉由透鏡片4在所希望 角度範圍内均勾等方向地擴散並以合成出射。接近此透鏡片4可 配置液晶顯示面板。 如上述’設有由反射片5包住導光板1，ϋ於光入射面側la 插入點光源2之” 6。而且係對其插人π 7插人並安裝點光源 2……之故，點光源2·.....之間即存在有反射片5。結果，點光源 2··.···間之基板21表面將由反射片5覆蓋，而可防止受基板21之 色調及安裝零件之影響使纽率降低。又，由於係以反射片5圍 繞導光板1之構造，故可防止自點光源2兩邊漏光。 第3圖係將第2圖所示之反射片5安裝於導光板！前之反射 片5展開狀斜視圖。 如第3圖所示’於反射片5設有導光板i之反射面u、3個 側面13,以及相對於與光入射面la之間所形成之空間6之面及插 入口 7。對於導光板】密著反射片5並且彎曲，而與導光板】由雙 面勝帶或黏著劑等所成之黏著層8固定。 第4圖為本發明另一實施形態之斜視圖在點光源之插入口 7 31J 740 10 1254176 没有切口 7a。除設置此切口 7a卜 一 卜，、上述貫施形態為相同之構 成，為避免重覆說明，附上相同符號而省略其說明。 入口 7之尺寸公差無需太正 如此，因設置切口 7a，而具有插 確之優點。 於上述實施形態，反射片5係由單片所構成。又，反射片5 為白色或銀色反射片均可。 依據本發明之構成，較第5圖所示之習用構造，導光板之出 射面上之平均輝度約可提升20%。 又，於上述實施形態中係使用白色咖晶片’但點光源2亦 可使用多數單色LED晶片（例如藍色）。此時，可於導光板^吏用 可將點光源的射出光變換為白色光之波長變換裝置。例如，其波 長變換裝置可為添加於導光板！内之螢光物質，或設於導光板丄 之光出射面12或光反射面11之螢光物質層所構成，此螢光物質 如採用藍色LED時可用YAG系螢光物質。 [發明之效果] 如上之說明’本發明係岐射片包住導光板，並於光入射面 側設置可插人點光狀”，而成為對其插人口可插人點光源之 構造’藉此可防止时裝有點光源之基板之色調或安裝零件之影 響而使光效率降低。又’由於係以反射片圍繞導光板之構造，故 可防止自點光源兩側之漏光’而可提高導光板之光出射面之輝 度，並使輝度不均變小，以提供明亮、且均勻之面光源裝置。 311740 1] 1254176 [圖式簡單說明] 之剖 第1圖係本發明之一實施形態之面光源裝置的概略構成 面圖。 第2圖係於導光板安裝有反射片之狀態之斜視圖。 第圖係於導光板安裝反射片前之斜視圖。 第4圖係本發明另一實施形態之斜視圖。 第5圖係使用LED元件之面光源的概略剖面圖。 1 導光板 1 a 光入射面 2 點光源 3 擴散片 4 透鏡片 5 反射片 6 空間 7 插入口 7a 切口 8 勒者層 11 光反射面 12 光出射面 13 側面 21 基板 22 反光罩 311740 121254176 发明Invention Description: [Technical Field] The present invention relates to an assembly of point light sources composed of light-emitting elements such as light-emitting diode (LED) elements, and is mainly used for backlighting of liquid crystal display panels A surface light source device such as illumination. [Prior Art] As a surface light source for a backlight of a liquid crystal display panel, a light-transmitting flat plate is used as an edg-light method of a light guide plate. The surface light source is a side incident light from a side end surface (edge portion) of the light guide plate formed by a transparent parallel plate or a wedge-shaped flat plate to spread the entire area of the light guide plate and to propagate the light. A part of the light reflecting member on the back surface of the light guide plate diffuses and reflects light, and diffused light is emitted from the front surface of the light guide plate. The edge light type light guide plate used for the light source of the liquid crystal display panel is widely used because it can reduce the thickness of the light guide plate and simplify the structure. The edge light source of many edge light modes uses a cold cathode tube lamp as its light source, and a cold cathode tube lamp is mounted on the edge of the light guide plate. On the other hand, in recent years, portable devices have become popular, and there is a need for power saving. Fang, & as a backlight source with a π-type device, compared with conventional cold-cathode tube lamps, the use of LED components with low power consumption as a light source has attracted attention and practical use. Figure # is a schematic cross-sectional view of a surface light source using LED elements. As shown in the figure, the side surface light source is composed of a light guide plate 1, a point light source 2 formed by an LED, and the like. A square light source 2 is formed by a plurality of white led wafers 311740 5 ! 254176 at the edge of the V-plate 1 . The light guide plate 1 is provided with a light reflecting surface u on the side perpendicular to the point light source 2, and a light exit surface 12 is provided on the side opposite to the light reflecting surface 11. Then, the light of the point light source 2 is reflected on the three side faces 13 of the light reflecting surface 11 and the guiding pure one, and most of the incident light is finally emitted from the light emitting surface 12 to have uniform light of uniformity. Exit. Further, a diffusion sheet 3 and a lens sheet 4 are disposed on the upper surface of the light exit surface of the light guide plate 1. The structure around the point light source 2 is a structure in which the reflector 22 surrounds the substrate 21 on which the LEDs are mounted, and the light of the point source 2 can be guided to the light guide plate. However, the LED element is used as a light source. At this time, it is necessary to fix a plurality of chip wafers on the substrate 21, and the reflection efficiency of the light is affected by the surface state of the substrate. For example, on the substrate 21, the resistor and the diode are sealed, and light is absorbed by the color tone of the component, which causes a problem of lowering the light efficiency. Further, when the components fixed on the substrate 21 have errors in the right and left directions, there is a problem that the luminance of the left and right sides is uneven. Further, the reflector 22 does not enclose the structure of the body of the point light source 2, so that there is a problem that light leakage is caused and light efficiency is lowered. The yarn of the present invention solves the above-mentioned problem, and aims to provide a surface light source with improved light efficiency and improved luminance unevenness. Means for Solving the Problem 311740 6 1254176 The present invention relates to a surface light source device that emits light from a plurality of point light sources disposed on one side of an end surface of a light guide plate and emits light on a light reflecting surface of the light guiding plate. The surface light source device for backlighting is characterized in that the light reflecting surface of the light guide plate is provided with a reflection of the light-emitting surface of the light-reflecting sheet surrounding the majority of the point light sources, and the reverse (four) is provided with a plug. In the insertion port of the above-mentioned point system, the insertion port 4 has a slit σ' and a space for enclosing the light reflecting surface and the plurality of point light sources. The number of populations of the reflective sheet can be set to be the same as the number of point sources, and the point source can be inserted into the insertion port. Further, when a white light that emits white light is used, and a single-color LED that emits monochromatic light is used as a point light source, a wavelength conversion device that converts the light emitted from the single-color LED into white light can be provided on the guide plate. According to the above configuration, the surface light source 1 is placed in a light source such as a light source of a liquid crystal display panel using a point light source. The point light source is inserted and mounted on a population, and thus a reflection sheet exists between the point light sources. As a result, the influence of the substrate to which the point source is fixed can be reduced, and the light leakage can be reduced by the reflection sheet 15 around the light source, thereby improving the light efficiency. [Embodiment] Hereinafter, the actual g of the present invention will be described with reference to the ® surface. Fig. 2 is a schematic cross-sectional view showing the surface light source device of the present invention, and Fig. 2 is a perspective view showing the state of the film. Here, the same parts as those conventionally used are attached to: Fig. 2 and Fig. 2, and the surface light source of the present invention is a point light source composed of a light guide plate and an LED. 2.··. Various control circuits (not shown) are formed. Here, the control circuit includes, for example, a circuit for detecting the total amount of light emitted from the light exit surface 12 of the light guide plate 1 to adjust and supply the power of the point light source 2 so that the amount of emitted light is an optimum value. The light incident surface la provided at the edge portion of the V-light plate 1 is opposed to the point light source 2 of the white LED wafer. In the present embodiment, six white LED chips are fixed on the substrate 21 as point light sources 2·····. The white LED chip is formed by, for example, accommodating LEDs of three colors of R, G, and B in one unit to form a white light, or converting a light emitted from the LED into white light by using a fluorescent material to form a monochrome LED. Just fine. For example, when a GaN-based blue LED is used as the fluorescent material, a YAG (yttrium aluminium garnet)-based fluorescent material is used for T. A light reflecting surface u is provided on the side of the light guide plate 1 perpendicular to the point light source 2.... In order to prevent light leakage and improve reflection efficiency, the light reflecting surface 11 is subjected to dot printing or a corneal recess. A light exit surface 12 is provided on a side of the light guide plate 1 opposite to the light reflecting surface u. Thus, the secret of each of the LEDs from the point source 2 is reflected on the m side faces 13 of the light-reflecting surface light guide plate, and most of the persons who emit the light finally emit light having the uniformity of the uniformity from the light exit face. Then, the material of the quick light guide plate 1 is selected from the materials of the translucent core, and usually a acrylic resin or a polycarbonate resin can be used. The shape of the light guide plate i is a parallel flat plate or a wedge-shaped flat plate. The thickness of the light guide plate i is usually about i to 5, and the use of led can be made thinner than when using a cold cathode tube lamp. 311740 8 1254176 Further, other light transmissive materials such as polyacrylic acid ester or thioglycolic acid such as p〇lymethyl methacrylate and p〇lymethyl aery late may be used. Monomer or copolymer of methacrylic acid ester (polyethylene terephthalate), polyethylene (polybuthylene terephthalate), polyester (p〇iyester), polycarbonate A thermoplastic resin such as polycarbonate, polystyrene, or polymethyl pentene, or a urethane acrylate crosslinked with ultraviolet or electron rays. , acrylate such as polyester acrylate, transparent resin such as unsaturated polyester, transparent glass, transparent ceramics, etc. According to the invention, the reflection sheet 5 which surrounds the light-emitting surface 1 of the light guide plate 1 and encloses the light guide plate 1 is provided. That is, the reflection sheet 5 is disposed to surround the light guide plate 1 including the reflection surface η of the light guide plate 1 and the three side faces 13. Further, between the reflection sheet 5 and the light incident surface la side of the light guide plate 1, a space 6 surrounded by the reflection sheet 5 is provided. The reflection sheet 5 and the light guide plate 1 are fixed by an adhesive layer 8 such as a double-sided tape or an adhesive. As shown in Fig. 2, an insertion port 7 into which the point light source 2 of the LED can be inserted is provided opposite to the light guide plate 6 surrounded by the reflection sheet 5. Further, a diffusion sheet 3 and a lens sheet 4 are disposed on the upper surface of the light reflecting surface 11 of the light guiding plate 1. The composition of the sheet may be single or two sheets, and the order of overlapping may be reversed. Then, the point light sources 2, . . . mounted on the substrate 21 are respectively inserted into the insertion ports 7 of the reflection sheets 5 fixed to the light guide plate 1 by their insertion ports 7 Empty 311740 9 1254176 between 6 and 6. Then, the substrate 21 on which the LEDs are mounted is fixed by screws or adhesives on the outer frame of the outer side of the light guide plate, and the point light source 2 can be disposed at a predetermined position of the light guide plate. Each of the LED light sources of the 光源 point light source 2····· enters the inside of the light guide plate 1 and is reflected by the light reflection pattern and the three side end faces provided on the light reflecting surface 1 而 to condense the light, and the self-light guide plate The light exiting surface i2 of the light exits from the diffusing plate 3, and is diffused in the same angle range by the lens sheet 4 to be combined and emitted. The liquid crystal display panel can be disposed close to the lens sheet 4. As described above, 'the light guide plate 1 is covered by the reflection sheet 5, and the point light source 2 is inserted on the side of the light incident surface la. 6 and the insertion point π 7 is inserted and the point light source 2 is mounted. The reflection sheet 5 exists between the point light sources 2·..... As a result, the surface of the substrate 21 between the point light sources 2····· is covered by the reflection sheet 5, and the color tone and mounting of the substrate 21 can be prevented. The influence of the parts reduces the yield. Further, since the reflection sheet 5 surrounds the light guide plate 1, it is possible to prevent light leakage from both sides of the point source 2. Fig. 3 shows the reflection sheet 5 shown in Fig. 2 attached to the guide The light plate! The front reflection sheet 5 is expanded in an oblique view. As shown in Fig. 3, the reflection sheet 5 is provided with a reflection surface u, three side surfaces 13 of the light guide plate i, and is formed with respect to the light incident surface la. The surface of the space 6 and the insertion port 7. For the light guide plate, the reflection sheet 5 is adhered and bent, and is fixed to the light guide plate 8 by an adhesive layer 8 made of a double-sided tape or an adhesive or the like. The oblique view of another embodiment has no slit 7a at the insertion opening of the point light source 7 31J 740 10 1254176. In addition to the provision of the slit 7a, The description of the configuration is the same, and the description of the same reference numerals will be omitted, and the description thereof will be omitted. The dimensional tolerance of the inlet 7 does not need to be too positive, and the slit 7a is provided, which has the advantage of being inserted. The reflection sheet 5 is composed of a single piece. Further, the reflection sheet 5 may be a white or silver reflection sheet. According to the configuration of the present invention, the average luminance on the exit surface of the light guide plate is compared with the conventional structure shown in FIG. It can be increased by about 20%. In addition, in the above embodiment, a white coffee wafer is used, but a plurality of single-color LED chips (for example, blue) can be used for the point light source 2. In this case, the light guide plate can be used for the light guide plate. The wavelength conversion device of the light source is converted into a white light wavelength conversion device. For example, the wavelength conversion device may be a fluorescent material added to the light guide plate, or a light emitting surface 12 or a light reflecting surface 11 provided on the light guide plate The fluorescent material is composed of a YAG-based fluorescent material, and the YAG-based fluorescent material can be used as the fluorescent material. [Effect of the Invention] As described above, the present invention is such that the enamel sheet covers the light guide plate and is disposed on the light incident surface side. Pluggable Like light ", to become its insertion human population may be configured to interpolate a point source of 'the light efficiency can be prevented whereby the color tone of the substrate mounting part or the fashion of the point light source to reduce the impact. In addition, since the structure of the light guide plate is surrounded by the reflection sheet, the light leakage from both sides of the point light source can be prevented, and the luminance of the light exit surface of the light guide plate can be improved, and the unevenness of the luminance can be made small to provide a bright and uniform brightness. The surface light source device. 311740 1] 1254176 [Brief Description of the Drawings] Fig. 1 is a schematic plan view showing a surface light source device according to an embodiment of the present invention. Fig. 2 is a perspective view showing a state in which a light guide plate is mounted with a reflection sheet. The figure is a perspective view of the light guide plate before the reflection sheet is mounted. Figure 4 is a perspective view showing another embodiment of the present invention. Fig. 5 is a schematic cross-sectional view showing a surface light source using an LED element. 1 light guide 1 a light incident surface 2 point light source 3 diffuser 4 lens sheet 5 reflection sheet 6 space 7 insertion port 7a slit 8 trace layer 11 light reflection surface 12 light exit surface 13 side 21 substrate 22 reflector 311740 12