1297798 九、發明說明： 【發明所屬之技彳标領域】 本發明涉及一種背光模組，特別係消除光學暗區且出光輝度及出光 性較高之背光模組。 一 【先前技#?】 液晶顯示器為-種非自發細示裝置，細示主要藉由控術卜部光源所 發出光束之通過或者不通過來實現，因此通常需要外部光源成相應之導光裝 置，如背光模組，該背總組可將外部光源所發出之光束導向顯二面板/ ，由於發光沐體(全稱為Light Emitting Diode，縮寫為㈣)具有工作 電壓低、發緋度高、響絲麟、壽命長之伽，使其獻翻於手機、 PDA(個人數位助理）、顯示器之背光模組中。惟，發光二極體之出射光具較 強之光學指向性，即出射光具有-定之絲角度，當其直接射入背絲^之 導光板時’使得導光板入光面一侧易出現光學暗區，不易獲得較佳之入光均 勻度。手機用之背光模組之光源一般至少採用二顆以上發光H，目前$ 面上之背光模組設計以三顆發光二^體為主，而發光二^體又是背光模組中 成本較高之部分，現在廠家有以降低發光二^體顆數來降低成本，但是在降 低發光二極體顆數的同時，也會使背光模組整體輝度下降，或產生背光模組 出光均勻度大幅下降之情形。 請參閱第一圖與第二圖，分別係一種先前技術背光模組之平面示意圖與 立體示意圖。該背光模組10包括光源12及導光板13，導光板13包括一入 光面131，一與入光面131相連之出光面132，及與出光面132相對之底面 133。光源12係相對導光板η之入光面131設置，該光源12為複數發光二 ’該複數發光二極體之出射光束由導光板13之入光面131進入導光板 U後，於導光板13内發生反射。該導光板13引導光源12發出光束之傳輸 方向，並將其轉換成平面光從導光板13之出光面132出射。惟，由於發光 二^體之出射光具有一定發散角，使得導光板13之入光面131 —側出現光 學暗區15，該光學暗區15主要分佈於二4目鄰發光二極體之間，影響背光模 組10之輝度及出光均勻性。 、 提而發光二極體之發光角度可減小上述之光學暗區15，從而提高背光模 1297798 組ίο之入光均勻度。然，發光二^體之發光角度受到本身之設計及製程之 ， 限制，其成品發光角度不可調節，實際運用中實為不便。 【發明内容】 有鑑於此，提供一種出光均勻之背光模組實為必需。 -種背光模組’其包括-縣板，該導光板具有—出光面及與該出光面 相對之底面；兩顆發光^體，分別設置於該導光板一端角之兩側處，與該 $顆發光沐體相對之導光板端角之表面為入光面；其中，該導光板端角中 叹置有貫穿該導光板之出光面與底面之孔，兩顆發光^體發出之光束經該 入光面進入該孔中，並以該孔為圓心呈扇形發散至該導光板中。 • 相較於先前技術，所述之背光模組因於導光板之任意一端角設置有一 孔，發光工^體發出之光束不係直接射入導光板内，係先由導光板之入光 面集中射入4嫌導端角之孔中，再由該孑匕向外發射，該孔之形狀用來控 制光束射出之強度分佈與方向性，使絲以該孔為圓心、呈扇形均句練。這 樣可避免由於發光二體之出射光具有一定發散角使得導光板之入光面一側 出現光學暗區，從而提高背光模組之出光輝度及出光均勻性。 【實施方式】 下面將結合附圖對本發明作進一步詳細說明。 Μ-併參閱第二圖與第四圖，第三圖係、本發明背光模組之立體分解圖， 第四圖係本發明背规組之導光板、led光源娜框組合之平面示意圖。該 背光板組20包括遮光帶25、導光板21、兩顆LED光源22、膠框24及反射 片26。該導光板21之材料一般為透明樹脂材料，例如聚甲基丙烯酸甲酯 (PMMA)或5^石反8复自曰(PC)專。該導光板21具有一出光面212及與該出光面212 相對之底© 213及複數側面，該出光面212上設置有複數網點，用來控制出 射光之方向。該導絲^ 21與膠框24相配合安裝，兩顆膽絲22設置於 膠框24之LED收容部241，且設置於導光板21之一端角之兩側處，該端角 為銳角形狀，與該兩顆LED光源22姆之導光板21端角技面為入光面 211，該入光面211上設計有複數變化式v型凹槽211〇，該導光板u之該端 角中設計有一孔23，該孔23可為任意形狀，該孔23之内壁上設計有複數非 球面形突稜231，該複數非球面形突稜231之延伸方向與導光板之出光面 1297798 212之夾角優選為8度。於膠框24與導級21之結合處設置一遮光帶奶， 於導光板21及雜24之底面設置-反射26,遮光帶25及反射26能防 ^ 止光束漏掉。膠框24 2LED收容部241之内壁面可為反射面2410，或者設 置有反射片或反射板。 睛一併參閱第五圖，第五圖係本發明之背光模組之光束傳播示意圖。兩 顆LED光源22發出之光束射向導光板21之入光面2U ,藉由該入光面211 上之複數變化式V型凹槽2110使光束向導光板21之孔23中聚集，再由該 孔23向外發射，該孔23之形狀為任意形狀，用來控制光束射出之強度分佈 與方向性’且該孔23之内壁面上設置有複數非球面形突棱231，可進一步改 • 變光束發射之方向，調整秋導光板21之光束之均勻性。由導光板 光面211及孔23反射之光束入射至膠框24之LED收容部241之内壁上，再 由該LED收容部241之内壁反射面2410反射至導光板21中，入射至膠框24 與導光板21之底面之光束由設置於該底面之反射片26反射至導光板&中。 此種結構之背光模組20因兩顆LED光源22之間隔較遠，還有利於LED 光源散熱，使LED光源22之使用壽命得到延長。 可以理解地，導光板21之入光面211上之複數微結構亦可為變化式非 球面形突稜，只要能將LED光源發出之光束會聚於導光板21之端角上之孔 23中即可。導光板21之孔23之内壁上設計有複數長形微結構，用來調整孔 烈中光束方向使其均勻發射至導光板21中。該複數長形微結構之延伸方向 與導光板21之出光面212之夾角可任意設計，該複數長形微結構亦可為v 型凹槽結構。另，導光板21與膠框24之底面亦可設置反射板，用來防止光 能之損失。 與先前技術相比，所述之背光模組20因於導光板21之任意一端角設置 有入光面211 ’且該入光面211所在之導光板21之端角中設計有一孔23， 兩顆LED光源22相對導光板21之入光面211設置，所以，該LED光源22 發出之光束不係直接射入導光板21内’而係先由導光板21之入光面2U华 中射入位於導光板21端角之孔23中，且該入光面211上設計有複數微結構i 藉由該微結構將光束會聚於孔23中，再由該孔23向外發射，該孔23之形 狀用來控制光束射出之強度分佈與方向性，且該孔23之内壁面設計有複數 7 1297798 長形微結構，可進-步改變光束發射之方向，調整進入導光板21之光束之 均勻性，使光束以該孔23為圓心呈扇形均勻舰。這樣可避免由於㈣光 源22之出射光具有一疋發散角使得導光板21之入光面211 —側出現光學暗 區，從而提高背光模組20之出光輝度及出光均勻性。 綜上所述，本發明確已符合發明專利之要件，遂依法提出專利申請。惟， 以上所述者僅為本發明之較佳實施例，自不能以此限制本案之申請專利範 圍。舉凡熟悉本案技藝之人士援依本發明之精神所作之等效修飾或變化，皆 應涵蓋於以下申請專利範圍内。 【圖式簡單說明】 第一圖係先前技術之背光模組之平面示意圖。 第二圖係先前技術之背光模組之立體示意圖。 第三圖係本發明之背光模組之立體分解圖。 第四圖係本發明之背光模組之導光板、LED光源及膠框組合之平面示意 圖。 第五圖係本發明之背光模組之光束傳播示意圖。 【主要元件符號說明】 背光模組 20 導光板 21 發光二&體 22 子L 23 膠框 24 遮光帶 25 反射片 26 入光面 211 出光面 212 底面 213 突稜 231 收容部 241 V型凹槽 2110 網點 2121 反射面 2410 81297798 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a backlight module, and in particular to a backlight module which eliminates an optical dark area and has high light transmittance and high light output. A [previous technology #?] The liquid crystal display is a non-spontaneous display device, which is mainly realized by the passage or non-passing of the light beam emitted by the control light source. Therefore, an external light source is usually required to be a corresponding light guiding device, such as The backlight module can guide the light beam emitted by the external light source to the display panel 2, and the light emitting body (referred to as Light Emitting Diode, abbreviated as (4)) has low working voltage, high hair twist, and ringing The long life span makes it available in mobile phones, PDAs (personal digital assistants), and backlight modules for displays. However, the outgoing light of the light-emitting diode has a strong optical directivity, that is, the outgoing light has a certain angle of the wire, and when it is directly incident on the light guide plate of the back wire, the optical light is prone to optics on the light-incident side of the light guide plate. In the dark area, it is not easy to obtain a better uniformity of light entering the light. The light source of the backlight module for mobile phones generally uses at least two or more light-emitting Hs. At present, the backlight module on the surface is designed with three light-emitting diodes, and the light-emitting diode is a higher cost in the backlight module. In some parts, manufacturers now reduce the number of light-emitting diodes to reduce the cost. However, while reducing the number of light-emitting diodes, the overall brightness of the backlight module is also reduced, or the uniformity of the backlight module is greatly reduced. The situation. Please refer to the first figure and the second figure, respectively, which are schematic diagrams and perspective views of a prior art backlight module. The backlight module 10 includes a light source 12 and a light guide plate 13. The light guide plate 13 includes a light incident surface 131, a light exit surface 132 connected to the light incident surface 131, and a bottom surface 133 opposite to the light exit surface 132. The light source 12 is disposed on the light incident surface 131 of the light guide plate η. The light source 12 is a plurality of light emitting lights. The emitted light beam of the plurality of light emitting diodes enters the light guide plate U from the light incident surface 131 of the light guide plate 13 and is disposed on the light guide plate 13 . Reflection occurs inside. The light guide plate 13 guides the light source 12 to emit a light beam and converts it into planar light which is emitted from the light exit surface 132 of the light guide plate 13. The optical dark area 15 is mainly distributed between the two 4-dimensional adjacent light-emitting diodes. It affects the brightness and uniformity of the light output of the backlight module 10. The illumination angle of the light-emitting diode can be reduced to reduce the above-mentioned optical dark area 15, thereby improving the uniformity of light entering the backlight module 1297798. However, the illumination angle of the illuminating body is limited by its design and process, and the illumination angle of the finished product is not adjustable, which is inconvenient in practical use. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a backlight module with uniform light emission. a backlight module comprising: a county plate, the light guide plate has a light-emitting surface and a bottom surface opposite to the light-emitting surface; and two light-emitting bodies respectively disposed at two sides of one end angle of the light guide plate, and the $ The surface of the light-emitting body opposite to the end surface of the light guide plate is a light-incident surface; wherein the light-emitting surface has an aperture penetrating through the light-emitting surface and the bottom surface of the light guide plate, and the light beams emitted by the two light-emitting bodies pass through the light-emitting surface The light incident surface enters the hole, and is fanned into the light guide plate with the hole as a center. • Compared with the prior art, the backlight module has a hole formed at any corner of the light guide plate, and the light beam emitted by the illumination device is not directly incident into the light guide plate, and is first introduced by the light guide surface of the light guide plate. Concentrated into the hole of the 4th guide end corner, and then emitted outward from the raft, the shape of the hole is used to control the intensity distribution and directivity of the beam, so that the wire is centered on the hole and is fan-shaped. . In this way, the light emitted from the light-emitting body has a certain divergence angle, so that an optical dark area appears on the light-incident side of the light guide plate, thereby improving the light-emitting brightness and light-emitting uniformity of the backlight module. [Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings. Μ-see also the second and fourth figures, the third figure is an exploded perspective view of the backlight module of the present invention, and the fourth figure is a schematic plan view of the combination of the light guide plate and the led light source frame of the back gauge group of the present invention. The backlight panel 20 includes a light shielding strip 25, a light guide plate 21, two LED light sources 22, a plastic frame 24, and a reflective sheet 26. The material of the light guide plate 21 is generally a transparent resin material, such as polymethyl methacrylate (PMMA) or 5^石反8复自曰(PC). The light guide plate 21 has a light-emitting surface 212 and a bottom surface 213 opposite to the light-emitting surface 212 and a plurality of side surfaces. The light-emitting surface 212 is provided with a plurality of dots for controlling the direction of the emitted light. The guide wire 21 is mounted in cooperation with the plastic frame 24, and the two feather wires 22 are disposed on the LED receiving portion 241 of the plastic frame 24, and are disposed at two sides of one end angle of the light guide plate 21, and the end angle is an acute angle shape. The end surface of the light guide plate 21 with the two LED light sources 22 is a light incident surface 211, and the light incident surface 211 is provided with a plurality of modified v-shaped grooves 211, which are designed in the end angle of the light guide plate u. There is a hole 23, and the hole 23 can be of any shape. The inner wall of the hole 23 is provided with a plurality of aspherical ribs 231. The extending direction of the plurality of aspherical ribs 231 is preferably at an angle to the light-emitting surface 1297798212 of the light guide plate. It is 8 degrees. A light shielding tape is disposed at the junction of the plastic frame 24 and the guiding stage 21, and a reflection 26 is disposed on the bottom surface of the light guiding plate 21 and the impurity 24, and the light shielding tape 25 and the reflection 26 prevent the light beam from leaking. The inner wall surface of the plastic frame 24 2 LED housing portion 241 may be a reflecting surface 2410 or a reflecting sheet or a reflecting plate. Referring to FIG. 5 together, the fifth figure is a schematic diagram of beam propagation of the backlight module of the present invention. The light beams emitted from the two LED light sources 22 are incident on the light incident surface 2U of the light guide plate 21, and the light beam is concentrated in the holes 23 of the light guide plate 21 by the plurality of V-shaped grooves 2110 on the light incident surface 211, and then the holes are collected. 23 is outwardly emitted, the shape of the hole 23 is arbitrary shape for controlling the intensity distribution and directivity of the beam emission, and the inner wall surface of the hole 23 is provided with a plurality of aspherical shaped ribs 231, which can further change the beam In the direction of emission, the uniformity of the beam of the autumn light guide plate 21 is adjusted. The light beam reflected by the light guide surface 211 and the hole 23 is incident on the inner wall of the LED housing portion 241 of the frame 24, and is reflected by the inner wall reflecting surface 2410 of the LED housing portion 241 into the light guide plate 21, and is incident on the frame 24. The light beam with the bottom surface of the light guide plate 21 is reflected by the reflection sheet 26 disposed on the bottom surface into the light guide plate & The backlight module 20 of such a structure is advantageous for the heat dissipation of the LED light source due to the distance between the two LED light sources 22, so that the service life of the LED light source 22 is prolonged. It can be understood that the plurality of microstructures on the light incident surface 211 of the light guide plate 21 can also be a modified aspherical shape rib, as long as the light beam emitted from the LED light source can be concentrated in the hole 23 at the end corner of the light guide plate 21 can. The inner wall of the hole 23 of the light guide plate 21 is provided with a plurality of elongated microstructures for adjusting the direction of the beam in the hole to be uniformly emitted into the light guide plate 21. The angle between the extending direction of the plurality of elongated microstructures and the light exiting surface 212 of the light guide plate 21 can be arbitrarily designed, and the plurality of elongated microstructures can also be a v-shaped groove structure. In addition, a reflective plate may be disposed on the bottom surface of the light guide plate 21 and the plastic frame 24 to prevent loss of light energy. Compared with the prior art, the backlight module 20 is provided with a light entrance surface 211 ′ at any one end of the light guide plate 21 , and a hole 23 is formed in the end corner of the light guide plate 21 where the light incident surface 211 is located. The LED light source 22 is disposed opposite to the light incident surface 211 of the light guide plate 21, so that the light beam emitted from the LED light source 22 is not directly incident into the light guide plate 21, but is firstly incident on the light incident surface 2U of the light guide plate 21. In the hole 23 of the end of the light guide plate 21, the light incident surface 211 is designed with a plurality of microstructures i. The microstructure is used to concentrate the light beam in the hole 23, and then the hole 23 is emitted outward. The shape of the hole 23 It is used to control the intensity distribution and directivity of the beam emission, and the inner wall surface of the hole 23 is designed with a plurality of long structures of 1 1297798, which can change the direction of beam emission in a stepwise manner and adjust the uniformity of the beam entering the light guide plate 21, The light beam is fanned in a uniform shape by the hole 23 as a center. In this way, the optical dark area of the light-emitting surface 211 of the light guide plate 21 appears on the side of the light-emitting surface 211 of the light guide plate 21 due to the divergence angle of the light source 22, thereby improving the light-emitting brightness and uniformity of the light output of the backlight module 20. In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims. [Simple description of the drawings] The first figure is a schematic plan view of a backlight module of the prior art. The second figure is a perspective view of a prior art backlight module. The third figure is an exploded perspective view of the backlight module of the present invention. The fourth figure is a plan view of the combination of the light guide plate, the LED light source and the plastic frame of the backlight module of the present invention. The fifth figure is a schematic diagram of beam propagation of the backlight module of the present invention. [Main component symbol description] Backlight module 20 Light guide plate 21 Light-emitting two & Body 22 Sub-L 23 Plastic frame 24 Light-shielding tape 25 Reflecting sheet 26 Light-incident surface 211 Light-emitting surface 212 Bottom surface 213 Edge 231 Housing 241 V-groove 2110 dot 2121 reflective surface 2410 8