1285286 九、發明說明： 【發明所屬之技術領域j 本發明係關於-種發光裝置，特別是關於一種可作背 光模組之發光裝置及其導光板。 【先前技術】 P遺著電子科技的進步，尤其在日常生活中隨身電子產 品的盛行，對於輕薄短小、耗電量低的顯示器之需求係曰 . 益增加。其中，液晶顯示器（Liquid crystal Display，LCD ) 以其耗電量低、發熱量少、重量輕、以及非輻射性等等優 點，經被使用於各式各樣的電子產品中，並且已逐漸地取 代傳統的陰極射線管顯示器（Cold Cathode Tube Display， CRT Display ) 0 一般而s’液晶顯示器係主要包含一液晶面板（Liquid1285286 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a light-emitting device, and more particularly to a light-emitting device and a light guide plate which can be used as a backlight module. [Prior Art] The advancement of P's electronic technology, especially in the daily life of portable electronic products, is demanding for thin, short, low-power displays. Among them, liquid crystal displays (LCDs) have been used in a wide variety of electronic products due to their low power consumption, low heat generation, light weight, and non-radiation. Instead of the traditional cathode ray tube display (CRT Display) 0, the general s' liquid crystal display system mainly includes a liquid crystal panel (Liquid
Crystal Panel)、以及一背光模組（Backlight Module )。其 I 中，液晶面板係具有兩基板、以及一夾設於兩基板間的液 晶層；而背光模組係可將來自一光源的光線均勻地分佈在 液晶面板之表面，其中，背光模組也可稱為一發光裝置。 - 傳統上，作為發光裝置之背光模組係以冷陰極螢光燈（ColdCrystal Panel) and a Backlight Module. In the first embodiment, the liquid crystal panel has two substrates and a liquid crystal layer sandwiched between the two substrates; and the backlight module uniformly distributes light from a light source on the surface of the liquid crystal panel, wherein the backlight module is also It can be called a light-emitting device. - Traditionally, the backlight module as a light-emitting device is a cold cathode fluorescent lamp (Cold
Cathode Fluorescent Lamp，CCFL)或發光二極體（LightCathode Fluorescent Lamp, CCFL) or Light Emitter (Light)
Emitting Diode, LED)之光源。 請參照圖1，習知技術之發光裝置1，以一直下式 (Direct Type)發光裝置1為例，主要包含至少一光源11、 一背板12、以及複數光學薄膜13, 13’。 5 1285286 光源11係間隔排列設置於背板12内，其中光源u 可為發光二極體或冷陰極燈管，此係以複數冷陰極燈管為 例。複數光學薄膜13, 13,係設置於光源11之上，光源u 所發出之光線係射入複數光學薄膜13, 13,中，以使得光線 能均勻地自發光裝置1射出。其中，光學薄膜13, 13，係可 為導光板、稜鏡片、或其組合。 如圖2所示，其係為發光裝置i之俯視示意圖。由圖Emitting Diode, LED) light source. Referring to Fig. 1, a conventional light-emitting device 1 is exemplified by a direct-type light-emitting device 1 and mainly includes at least one light source 11, a back plate 12, and a plurality of optical films 13, 13'. 5 1285286 The light source 11 is arranged in the backing plate 12 at intervals. The light source u can be a light emitting diode or a cold cathode fluorescent tube. This is exemplified by a plurality of cold cathode fluorescent tubes. The plurality of optical films 13, 13 are disposed on the light source 11, and the light emitted from the light source u is incident on the plurality of optical films 13, 13, so that the light can be uniformly emitted from the light-emitting device 1. The optical films 13, 13 may be light guide plates, cymbals, or a combination thereof. As shown in FIG. 2, it is a schematic plan view of the light-emitting device i. Figure
中可知，間隔排列設置之光源11，因為混光之距離不足， 或是因為光學薄膜13, 13’之厚度不夠，故而造成較接近光 源11的部份產生亮帶B，而離光源u較遠的部份則產生 暗帶D 〇 習知技術為了解決此問題，通常是利用增加光源U 的數量，來減少㈣11之_距離，使光線能涵蓋整個 顯示區域。如此-來，卻會造成發光裝置W需的能 耗及原料成本增加。另-方法，則是增加光源u 風 薄膜13, 13,之間的距離，或是增加導光板之厚度，；避： 暗區D的產生，但卻會使得發光裝置i的體積增加或是導 光板之原料成本增加，這些都不符合市場的期待。導 因此，如何能提供-種導光板，可利 構設計的改變來改善導光的均^& * 導先板本身結 w J注’並且使得發光萝 光源能量能夠得到較完整的利用，並能減少光紅損、 實為一重要課題！ ^ ’ 【發明内容】 6 1285286 以下將參照相關圖式，說明依本發明之發光裝置及其 導光板之較佳實施例。 首先，請先參照圖3至圖8，以說明本較佳實施例之 導光板。 ^ 如圖3所示，導光板2具有一錐形凹部21，導光板2 係大致呈平板狀或楔形，且可利用透明之塑膠材料（例如 壓克力），以射出成型之方式，與錐形凹部21 —同成型。 導光板2係具有一出光表面22及一與出光表面22相 # 對而設之入光表面23，其中，錐形凹部21設置於導光板 2之出光表面22。 如圖4及圖5所示，錐形凹部21之截面，係可呈三 角狀（如圖4所示）、或弧狀凹陷（如圖5所示）。 再請參照圖3，本實施例中，錐形凹部21更可具有一 反射層211，用以協助光線反射入導光板2内部。 如圖6所示，本實施例中，至少一光源3係設於導光 板2之入光表面23，光源3可為一點光源或一燈管。本實 φ 施例中，光源3係為一點光源，例如為一發光二極體。須 . 注意者，光源3之數量並不受限制，可依實際設計之需求 而設置。 請參照圖7，導光板2更可具有一嵌合部24，嵌合部 24係設置於入光表面23且與錐形凹部21相對而設，光源 3係設置於嵌合部24内。其中，嵌合部24可與錐形凹部 21 —同射出成型於導光板2。 另外，如圖8所示，光源3也可被包覆於導光板2中， 1285286 俾使導光板2可作為光源3之一封膠體（Encapsulation)。 當複數光線由入光表面23射入到達錐形凹部21時， 只要光線入射錐形凹部21之角度大於全反射角時，則光 源3所發出之複數光線係會被全反射（total internal reflection, TIR)。而被全反射之光線，直到其射出導光板2 . 之角度小於全反射角時，光線即可射出導光板2。如此一 來，由光源3以垂直方向入射錐形凹部21之光線，即可 在較低能量損失的情形下，於導光板2中向水平方向擴 ® 散，使得光源3所發出之光線進入導光板2後，可由點光 源而形成發光的平面。 其中，導光板2更可具有複數網點（patterns) 25，其 係設置於入光表面23。愈遠離光源3，網點25的密度愈 大，以反射光源3所發出之複數光線。其中，網點25_可 以利用印刷油墨、或餘刻的方式形成於導光板2之入光表 面23，用以破壞光線於導光板2内的全反射現象，改變光 φ 線的出射路徑與方向，使光線能射出導光板2而向出光表 面22發光。換句話說，當導光板2内部反射的光線碰到 網點25時，即改變了光路徑而由出光表面22射出導光板 . 2，而沒有碰到網點25的光線，則繼續於導光板2内部進 行全反射，並藉由網點25分佈密度之不同，則可使導光 板2能形成平面均勻的發光體。 接著，請參照圖9至圖11以說明本發明較佳實施例 之發光裝置。 如圖9所示，發光裝置4包含一導光板5、以及一光 1285286 源6。發光裝置4可為一平面照明裝置，或一平面顯示器 用之背光模組，本實施例中，係以一背光模組為例。 導光板5係具有一凹部51。本實施例中，導光板5係 大致呈平板狀或楔形，且可利用透明之塑膠材料（例如壓 克力），以射出成型之方式，與凹部51 —同成型。 導光板5係具有一出光表面22及一與出光表面52相 對而設之入光表面53，其中，凹部51設置於導光板5之 出光表面52 〇 # 如圖4及圖5所示，凹部51之截面，係可呈三角狀（如 圖4所示）、或弧狀凹陷（如圖5所示）。 再請參照圖3，本實施例中，凹部51更可具有一反射 層511，用以協助光線反射入導光板2内部。 - 光源6係設置於導光板5之一入光表面53，凹部51 並與光源6相對應，用以反射來自光源6所發出之複數光 線。其中，凹部51更可具有一反射層511，用以協助光線 反射入導光板5内部，以達到全反射的功效。 ® 本實施例中，光源6可為點光源或為冷陰極燈管，光 胃 源6之數量可視實際產品設計需要而定，當然，發光裝置 4也可具有複數光源6。另外，視配合之光源6，凹部51 可為一錐形凹部或一凹槽。 如圖9及圖10所示，光源6為複數發光二極體，各 個發光二極體係對應一凹部51，凹部51係為一錐形凹部， 其與前述實施例中之錐形凹部21具有相同之技術特徵與 功效，於此不再贅述。 1285286 另外，如圖11所示，光源6,為複數冷陰極螢光燈， 各個冷陰極螢光燈係對應一凹部51 ’，凹部51，係為一凹 槽’用以反射來自光源6,所發出之複數光線。 當然，光源6, 6’也可如圖6至圖8所示，鄰設於導光 - 板5、嵌設於導光板5或被包覆於導光板5中。 _ 請參照圖10，當複數光線由入光表面53射入到達錐 形凹部51時，只要光線入射錐形凹部51之角度大於全反 射角時，則光源6所發出之複數光線係會被全反射（t〇tal internal reflection, TIR )。而被全反射之光線，直到盆射出 導光板5之角度小於全反射角時，光線即可射出導光板5。 如此一來，由光源6以垂直方向入射之光線，即可在較低 能量損失的情形下，於導光板5中向水平方向擴散，使得 光源6所發出之光線進入導光板5後，可由點光源而增成 發光的平面。 其中’導光板5係具有複數網點（patterns ) 55，其係 設置於入光表面23。愈遠離光源6，網點55的密度俞大， 鲁 以反射光源6所發出之複數光線。其中，網點5 5可以利 用印刷油墨、或餘刻的方式形成於導光板5，用以破壞光 線於導光板5内的全反射現象，改變光線的出射路徑與方 ’ 向，使光線能射出導光板5而向上發光。換句話說，當導 光板5内部反射的光線碰到網點55時，即改變了光路徑 而射出導光板5 ’而沒有碰到網點55的光線，則繼續於導 光板5内部進行全反射，並藉由網點55分佈密度之不同， 則可使導光板5能形成平面均勻的發光體。 11 1285286 自導光板5入光表面53的漏光反射回導光板5中，以增 加光線的利用率。 本實施例中，發光裝置4更可包含稜鏡板42, 42’，其 係鄰設於擴散板42。光線經過擴散板42後再進入稜鏡板 -42, 42’，棱鏡板42, 42’可使光線聚光，以提高出射光之方 _ 向性，集中於垂直於棱鏡板42, 42’之方向。 綜上所述，本發明之發光裝置及其導光板，於導光板 上係具有凹部或錐形凹部，光源係與凹部或錐形凹部係對 ® 應而分別設置於導光板之出光表面及入光表面。與習知技 術相比，本發明之發光裝置及其導光板藉由凹部或錐形凹 部，使得點光源或線光源所發出之光線，能於導光板内反 射，直至光線射出導光板之角度小於全反射角，才能射出 導光板。故可使導光板成為均勻發光的平面發光體。如此 一來，即可避免於導光板形成暗區，並可充份利用光源所 發出之光能量，以減少光源所需要的數量或避免增加光源 φ與導光板之間的距離，故能降低生產成本及發光裝置所需 要之體積。 - 以上所述僅為舉例性，而非為限制性者。任何未脫離 。 本發明之精神與範疇，而對其進行之等效修改或變更，均 應包含於後附之申請專利範圍中。 【圖式簡單說明】 圖1係為習知技術發光裝置之一示意圖； 圖2係為習知技術發光裝置之一俯視示意圖，其中發 12 1285286 圖1係為習知技術發光裝置之一示意圖； 圖2係為習知技術發光裝置之一俯視示意圖，其中發 光裝置係具有亮帶B及暗帶D ; 圖3係為本發明實施例中之導光板之一剖面示意圖； 圖4係為圖3中之錐形凹部之一放大示意圖，其中錐 形凹部為三角形； • 圖5係為圖3中之錐形凹部之一放大示意圖，其中錐 形凹部係呈弧狀凹陷； • 圖6係為本發明實施例中之導光板之另一示意圖，其 中，光源係鄰設於導光板； 圖7係為本發明實施例中之導光板之又一示意圖，其 中，導光板係具有嵌合部，光源係嵌設於導光板； 圖8係為本發明實施例中之導光板之又一示意圖，其 ' 中，導光板係為光源之封裝體； 圖9係為本發明實施例中之發光裝置之一示意圖，其 I 中光源為發光二極體； 圖10係為本發明實施例中之發光裝置沿圖9之A-A’ 直線之一剖面示意圖；以及 : 圖11係為本發明實施例中之發光裝置之另一示意 /圖，其中光源為冷陰極螢光燈。 元件符號說明： I 發光裝置 II 光源 13 1285286It can be seen that the light source 11 arranged at intervals is insufficient due to the distance of the light mixing, or because the thickness of the optical film 13, 13' is insufficient, so that the portion closer to the light source 11 produces the bright band B and is farther away from the light source u. The part that produces the dark band D 〇 conventional technique in order to solve this problem, usually by increasing the number of light sources U, to reduce the distance of (four) 11 so that the light can cover the entire display area. In this way, it will cause the energy consumption and raw material cost of the light-emitting device to increase. Another method is to increase the distance between the light film u, 13, or increase the thickness of the light guide plate; avoid: the generation of the dark area D, but it will increase the volume of the light-emitting device i or lead The cost of raw materials for light panels has increased, and these are not in line with market expectations. Therefore, how to provide a kind of light guide plate can be used to improve the design of the light guide to improve the light guide light and the light guide light source can be more fully utilized, and It can be an important issue to reduce light redness! [Brief Description of the Invention] 6 1285286 A preferred embodiment of a light-emitting device and a light guide plate according to the present invention will be described below with reference to the related drawings. First, please refer to Figs. 3 to 8 to explain the light guide plate of the preferred embodiment. As shown in FIG. 3, the light guide plate 2 has a conical recess 21, and the light guide plate 2 is substantially flat or wedge-shaped, and can be formed by injection molding, using a transparent plastic material (for example, acrylic). The concave portion 21 is formed in the same shape. The light guide plate 2 has a light-emitting surface 22 and a light-incident surface 23 opposite to the light-emitting surface 22, wherein the tapered recess 21 is disposed on the light-emitting surface 22 of the light guide plate 2. As shown in Figs. 4 and 5, the tapered recess 21 may have a triangular cross section (as shown in Fig. 4) or an arcuate recess (as shown in Fig. 5). Referring to FIG. 3 again, in the embodiment, the tapered recess 21 may further have a reflective layer 211 for assisting light reflection into the interior of the light guide plate 2. As shown in FIG. 6, in the embodiment, at least one light source 3 is disposed on the light incident surface 23 of the light guide plate 2. The light source 3 can be a light source or a light tube. In the embodiment of the present invention, the light source 3 is a light source, for example, a light-emitting diode. Note that the number of light sources 3 is not limited and can be set according to the actual design requirements. Referring to Fig. 7, the light guide plate 2 may further include a fitting portion 24 provided on the light incident surface 23 and facing the tapered recess portion 21, and the light source 3 is disposed in the fitting portion 24. The fitting portion 24 can be molded and formed on the light guide plate 2 together with the tapered recess portion 21. In addition, as shown in FIG. 8, the light source 3 can also be wrapped in the light guide plate 2, and the light guide plate 2 can be used as an encapsulation of the light source 3. When the plurality of rays are incident from the light incident surface 23 into the conical recess 21, as long as the angle of incidence of the light into the conical recess 21 is greater than the total reflection angle, the plurality of rays emitted by the light source 3 are totally reflected (total internal reflection, TIR). The light that is totally reflected until the angle at which it exits the light guide plate 2 is smaller than the total reflection angle, the light can be emitted from the light guide plate 2. In this way, the light incident on the conical recess 21 by the light source 3 in the vertical direction can be diffused in the horizontal direction in the light guide plate 2 under the condition of low energy loss, so that the light emitted by the light source 3 enters the guide. After the light plate 2, a light-emitting plane can be formed by the point light source. The light guide plate 2 may further have a plurality of patterns 25 disposed on the light incident surface 23. The farther away from the source 3, the greater the density of the dots 25, to reflect the plurality of rays emitted by the source 3. The dot 25_ can be formed on the light incident surface 23 of the light guide plate 2 by using printing ink or in a residual manner to destroy the total reflection phenomenon of the light in the light guide plate 2, and change the exit path and direction of the light φ line. Light is emitted from the light guide plate 2 to emit light toward the light exit surface 22. In other words, when the light reflected inside the light guide plate 2 hits the halftone dot 25, the light path is changed and the light guide plate 22 is emitted from the light exit surface 22. When the light that does not hit the halftone dot 25 is continued, the light guide plate 2 is continued. By performing total reflection and by different distribution densities of the dots 25, the light guide plate 2 can form a uniform light emitter. Next, a light-emitting device according to a preferred embodiment of the present invention will be described with reference to Figs. As shown in FIG. 9, the light-emitting device 4 includes a light guide plate 5 and a light source 1285286. The illuminating device 4 can be a planar illuminating device or a backlight module for a flat panel display. In this embodiment, a backlight module is taken as an example. The light guide plate 5 has a recess 51. In the present embodiment, the light guide plate 5 is substantially flat or wedge-shaped, and can be molded in the same manner as the concave portion 51 by means of a transparent plastic material (e.g., acryl). The light guide plate 5 has a light-emitting surface 22 and a light-incident surface 53 opposite to the light-emitting surface 52. The recess 51 is disposed on the light-emitting surface 52 of the light guide plate 5. As shown in FIG. 4 and FIG. The cross section can be triangular (as shown in Figure 4) or curved (as shown in Figure 5). Referring to FIG. 3 again, in the embodiment, the concave portion 51 further has a reflective layer 511 for assisting light reflection into the interior of the light guide plate 2. The light source 6 is disposed on one of the light incident surfaces 53 of the light guide plate 5, and corresponds to the light source 6 for reflecting the plurality of light rays emitted from the light source 6. The recess 51 may further have a reflective layer 511 for assisting light reflection into the interior of the light guide plate 5 to achieve total reflection. In this embodiment, the light source 6 can be a point source or a cold cathode tube. The number of the light source 6 can be determined according to actual product design requirements. Of course, the illumination device 4 can also have a plurality of light sources 6. Further, depending on the light source 6 to be fitted, the recess 51 may be a tapered recess or a recess. As shown in FIG. 9 and FIG. 10, the light source 6 is a plurality of light emitting diodes, each of the light emitting diode systems corresponds to a concave portion 51, and the concave portion 51 is a tapered concave portion which has the same shape as the tapered concave portion 21 in the foregoing embodiment. The technical features and effects will not be described here. 1285286 In addition, as shown in FIG. 11, the light source 6 is a plurality of cold cathode fluorescent lamps, each cold cathode fluorescent lamp corresponds to a concave portion 51', and the concave portion 51 is a groove for reflecting from the light source 6. The multiple rays emitted. Of course, the light sources 6, 6' may be disposed adjacent to the light guide plate 5, embedded in the light guide plate 5, or covered in the light guide plate 5, as shown in Figs. Referring to FIG. 10, when a plurality of rays are incident from the light incident surface 53 into the tapered concave portion 51, as long as the angle of incidence of the light entering the tapered concave portion 51 is greater than the total reflection angle, the plurality of light rays emitted by the light source 6 are completely T〇tal internal reflection (TIR). The light that is totally reflected until the angle at which the basin exits the light guide plate 5 is smaller than the total reflection angle, the light can be emitted from the light guide plate 5. In this way, the light incident from the light source 6 in the vertical direction can be diffused in the horizontal direction in the light guide plate 5 in the case of low energy loss, so that the light emitted by the light source 6 enters the light guide plate 5, and the light can be made. The light source is added to the plane of illumination. The light guide plate 5 has a plurality of patterns 55 which are disposed on the light incident surface 23. The farther away from the light source 6, the density of the dots 55 is large, and the plurality of rays emitted by the light source 6 are reflected. The dot 5 5 can be formed on the light guide plate 5 by using printing ink or in a residual manner to destroy the total reflection phenomenon of the light in the light guide plate 5, and change the exit path and the direction of the light to enable the light to be emitted. The light panel 5 emits light upward. In other words, when the light reflected inside the light guide plate 5 hits the halftone point 55, that is, the light path is changed to emit the light guide plate 5' without hitting the light of the halftone point 55, the total reflection inside the light guide plate 5 is continued, and By the difference in distribution density of the dots 55, the light guide plate 5 can be formed into a uniform light illuminator. 11 1285286 Light leakage from the light incident surface 53 of the light guide plate 5 is reflected back into the light guide plate 5 to increase the utilization of light. In this embodiment, the light-emitting device 4 further includes a seesaw 42 and 42' disposed adjacent to the diffuser 42. The light passes through the diffuser plate 42 and then enters the seesaw-42, 42'. The prism plates 42, 42' can condense the light to improve the direction of the outgoing light, focusing on the direction perpendicular to the prism plates 42, 42'. . In summary, the light-emitting device and the light guide plate of the present invention have a concave portion or a conical concave portion on the light guide plate, and the light source system and the concave portion or the conical concave portion are respectively disposed on the light-emitting surface of the light guide plate and into the light-emitting surface. Light surface. Compared with the prior art, the light-emitting device of the present invention and the light guide plate thereof have a concave portion or a conical concave portion, so that the light emitted by the point light source or the line light source can be reflected in the light guide plate until the angle at which the light is emitted from the light guide plate is smaller than The total reflection angle can be used to shoot the light guide. Therefore, the light guide plate can be made into a uniform light-emitting planar light-emitting body. In this way, the dark area of the light guide plate can be avoided, and the light energy emitted by the light source can be fully utilized to reduce the number of light sources required or to avoid increasing the distance between the light source φ and the light guide plate, thereby reducing production. Cost and volume required for the illuminating device. - The above description is for illustrative purposes only and not as a limitation. Anything is not detached. The spirit and scope of the invention, and equivalent modifications or variations thereof, are intended to be included in the scope of the appended claims. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a conventional light-emitting device; FIG. 2 is a schematic top view of a conventional light-emitting device, wherein FIG. 1 is a schematic diagram of a conventional light-emitting device; 2 is a top plan view of a light-emitting device of the prior art, wherein the light-emitting device has a bright band B and a dark band D; FIG. 3 is a schematic cross-sectional view of a light guide plate in the embodiment of the present invention; An enlarged schematic view of one of the tapered recesses, wherein the tapered recesses are triangular; • FIG. 5 is an enlarged schematic view of one of the tapered recesses of FIG. 3, wherein the tapered recesses are arcuately recessed; Another schematic diagram of the light guide plate in the embodiment of the present invention, wherein the light source is disposed adjacent to the light guide plate; FIG. 7 is another schematic view of the light guide plate according to the embodiment of the present invention, wherein the light guide plate has a fitting portion and a light source. 8 is a schematic view of a light guide plate according to an embodiment of the present invention, wherein the light guide plate is a package of a light source; FIG. 9 is a light-emitting device according to an embodiment of the present invention. a schematic diagram FIG. 10 is a schematic cross-sectional view of the light-emitting device of the embodiment of the present invention taken along line A-A' of FIG. 9; and FIG. 11 is a light-emitting device according to an embodiment of the present invention; Another schematic/figure wherein the light source is a cold cathode fluorescent lamp. Description of component symbols: I Illumination device II Light source 13 1285286
12 背板 13, 13, 光學薄膜 2 導光板 21 錐形凹部 211 反射層 22 第一表面 23 第二表面 24 嵌合部 25 網點 3 光源 4 發光裝置 41 反射板 42, 42, 稜鏡板 5 導光板 51 凹部 511 反射層 52 第一表面 53 第二表面 55 網點 6, 6’ 光源 A-A， 直線 B 亮帶 D 暗帶12 Backing plate 13, 13, optical film 2 light guide plate 21 tapered recess 211 reflective layer 22 first surface 23 second surface 24 fitting portion 25 mesh point 3 light source 4 illuminating device 41 reflecting plate 42, 42, fascia 5 light guide plate 51 recess 511 reflective layer 52 first surface 53 second surface 55 dot 6, 6' light source AA, straight line B bright band D dark band