1344047 - 100年04月14日後正替换頁 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一種背光模組，尤其涉及一種應用於液晶顯 示裝置的背光模組。 【先前技術】 [0002] 近幾年來，隨著便檇式電話、便檇式資訊終端等小型便 檇式終端設備的顯示器件的發展，小型、輕便且功耗低 的液晶顯示裝置被廣泛應用。液晶顯示裝置最主要的部 ^ 件係液晶顯示板，液晶顯示板包括設置於其背面側的輔 助照明裝置，即背光模組，及設置於其前面側的輔助照 明裝置，即前光源模組。 ， [0003] 發光二極體（Light Emitting Diode,簡稱LED )由 於具有壽命長、節能、環保以及尺寸小等優點，被越來 越多地作為光源應用於液晶顯示裝置的背光模組中。由 於LED尺寸較小，於背光模組的設計過程中被視為點光源 〇 ® [0004] 請參閱圖1A與圖1B ，先前的背光模組10包括一個導光板 (Light Guide Plate,簡稱LGP) 14與一個LED光源 12。導光板14主要包括入光面142、出光面144、反射面 146與幾個側面（未標出）。導光板14的作用係將LED光 源12發出的點光源轉換成從導光板14出光面144發出的面 光源。為提高導光板14出射光的效率與均勻性，可於反 射面設置多種微結構162。微結構162設置於以LED光源 12為圓心的同心圓弧上。LED光源12射出的光線，幾乎垂 直地入射於微結構162上，因此，可藉由微結構162避免 095144717 表單編號A0101 第3頁/共14頁 1003128035-0 1344047 100年04月14日修正替换頁 光線外向擴散而衰減，從而提高LED光源12由點光源向面 光源的轉換效率。 ~ [0005] 惟，LED發光部分的面積雖然較小，仍有一定的幾何尺寸 ，於一些精度要求較高或系統本身尺寸較小的應用場合 中，LED的尺寸會對系統光學性能，例如：光出射效率、 光出射均勻性產生影響。 [0006] 有鑒於此，提供一種具有更高的光出射效率、更高的光 出射均勻性的背光模組實爲必要。 【發明内容】 β [0007] 一種背光模組’其包括至少一紙矣樣屢二親.導光板，該 . - ·'· , Λ .....· : . ··； ： ·_.·· · ·' 導光板包括一入光面’ 一與旅入光肩读I1 鄭綠靡光面’及 广：·* Λ*_. ... .:'怎...供瘁 一與出光面相對的反射面，_反龢面上遂1%數微結構 ，該光源包括一發光面正對導光板的入光面。該複數微 結構分別設置於以發光面上的複數點為圓心的複數組同 心圓弧上，且該複數微結構所在的每一組同心圓弧均分 佈在整個反射面上。 [0008] 該光源係發光二極體。 [0009] 該光源發光面上進一步包括複數等分線將發光面等分， 上述的複數點分別分佈於發光面的不同等分線上。 [0010] 分佈於同一圓弧上的微結構的間距相同。 [0011] 不同組同心圓弧的交叉點僅設置一個微結構。 [0012] 上述微結構距離入光面越遠，其尺寸越大。 [0013] 上述微結構距離入光面越遠，其排列密度越大。 095144717 表單編號A01011344047 - After the April 14, 2014, the replacement page is being replaced. 6. Description of the Invention: [0001] The present invention relates to a backlight module, and more particularly to a backlight module applied to a liquid crystal display device. [Prior Art] [0002] In recent years, with the development of display devices for small-note-type terminal devices such as portable telephones and portable information terminals, small, lightweight, and low-power liquid crystal display devices have been widely used. . The most important part of the liquid crystal display device is a liquid crystal display panel. The liquid crystal display panel includes an auxiliary illumination device disposed on the back side thereof, that is, a backlight module, and an auxiliary illumination device disposed on the front side thereof, that is, a front light source module. [0003] Light Emitting Diode (LED) is used as a light source in a backlight module of a liquid crystal display device because of its long life, energy saving, environmental protection, and small size. Because the LED size is small, it is regarded as a point source in the design process of the backlight module. [0004] Referring to FIG. 1A and FIG. 1B, the previous backlight module 10 includes a light guide plate (LGP). 14 with an LED light source 12. The light guide plate 14 mainly includes a light incident surface 142, a light exit surface 144, a reflective surface 146 and several side surfaces (not shown). The function of the light guide plate 14 is to convert the point light source emitted from the LED light source 12 into a surface light source emitted from the light exit surface 144 of the light guide plate 14. In order to improve the efficiency and uniformity of light emitted from the light guide plate 14, a plurality of microstructures 162 may be disposed on the reflective surface. The microstructure 162 is disposed on a concentric arc centered on the LED light source 12. The light emitted by the LED light source 12 is incident on the microstructure 162 almost vertically. Therefore, the microstructure 162 can be avoided. 095144717 Form No. A0101 Page 3 / Total 14 Page 1003128035-0 1344047 Correction Replacement Page, April 14, 100 The light is outwardly diffused and attenuated, thereby improving the conversion efficiency of the LED light source 12 from the point source to the surface source. ~ [0005] However, although the area of the LED light-emitting part is small, there is still a certain geometric size. In some applications where the precision is high or the size of the system itself is small, the size of the LED will be optical performance of the system, for example: Light exit efficiency and light emission uniformity have an effect. In view of the above, it is necessary to provide a backlight module having higher light emission efficiency and higher uniformity of light emission. SUMMARY OF THE INVENTION [0007] A backlight module 'which includes at least one paper-like repeating two-member light guide plate, the ... - · '· , Λ .....: . . . .; ·· · · 'The light guide plate includes a light-incident surface'. I read the I1 Zheng Green 靡光面' with the travel light shoulder and the wide:·* Λ*_. ... .: 'How... The opposite reflecting surface of the light-emitting surface, the _reverse surface is 1% micro-structure, and the light source includes a light-emitting surface facing the light-incident surface of the light guide plate. The complex micro-structures are respectively disposed on a concentric arc of a complex array centered on a complex point on the light-emitting surface, and each set of concentric arcs in which the complex micro-structure is located is distributed over the entire reflective surface. [0008] The light source is a light emitting diode. [0009] The light-emitting surface of the light source further includes a plurality of bisectors to equally divide the light-emitting surface, and the plurality of points are respectively distributed on different bisectors of the light-emitting surface. [0010] The microstructures distributed on the same arc have the same pitch. [0011] Only one microstructure is provided at the intersection of different sets of concentric arcs. [0012] The farther the microstructure is from the light entrance surface, the larger the size. [0013] The farther the microstructure is from the light entrance surface, the greater the arrangement density. 095144717 Form Number A0101
笫4頁/共14 I 1003128035-0 13.44.047 100年04月14日梭正替换頁 [0014] 上述微結構為凹入或凸出結構。 [0015] 上述微結構為散射點或散射溝槽。 [0016] 上述微結構的剖面形狀包括矩形、方形、多邊形、橢圓 形、三角形、菱形或金字塔形。 [0017] 該導光板的入光面設置於導光板的一側面或導光板的一 角。笫4 pages/total 14 I 1003128035-0 13.44.047 Shuttle replacement page on April 14, 100 [0014] The above microstructure is a concave or convex structure. [0015] The above microstructure is a scattering point or a scattering groove. [0016] The cross-sectional shape of the above microstructure includes a rectangle, a square, a polygon, an ellipse, a triangle, a diamond, or a pyramid. [0017] The light incident surface of the light guide plate is disposed on one side of the light guide plate or a corner of the light guide plate.
[0018] 該複數微結構所在的同心圓弧的兩端均與所述反射面的 邊線相交。 [0019] 與先前技術相比，於該背光模組中，導光板上的微結構 係設置於以同一光源發光面上的複數點為圓心的複數組 同心圓弧上。故，於光源數目不增加及導光板的微結構 數目基本不變的情況下，該背光模組可具有更高的光出 射效率及光出射均勻性。 【實施方式】 [0020] 下面將結合附圖對本發明實施例作進一步的詳細說明。 [0021] 請參閱圖2A與圖2B，本發明第一實施例提供一種背光模 組20，其包括一個光源22、一個導光板24。該導光板24 包括一入光面242，一與入光面242相鄰的出光面244及 一與該出光面244相對的反射面246，其中該反射面246 上設置有複數第一微結構262及第二微結構264。該光源 22設置於入光面242的一側，該光源22進一步包括一發光 面222與導光板24的入光面242相對。本實施例中，該光 源22為發光二極體（LED)。 095144717 表單編號 A0101 第 5 頁/共 14 頁 1003128035-0 1344047 100年〇4月14日修正雜7 [0022] 該導光板24係用透明材料，如丙烯酸樹脂、聚碳酸酯、 聚乙烯樹脂或玻璃等製成。光線從光源22的發光面222射 出，經入光面242進入導光板24中，一部分光線直接從出 光面244出射，另一部分光線於導光板24内按照全反射原 則傳播，經反射面246上的微結構262、264反射後，由 出光面244射出。 [0023] 請一併參閱圖3，光源22的發光面222上可進一步包括兩 條垂直於導光板24的反射面246的等分線224、226將光 源22的發光面222分成三等份。設置於反射面246上的第 一微結構262分佈於以等分線224上任一點為圓心的複數 組同心圓弧上，第二微結構#4赍％於叙等$線226上任 一點為圓心的複數組同心圓i上爹第一構262及第 二微結構264可為凹入或凸出的結構。優選地，該第一微 結構262及第二微結構264可為散射點或散射溝槽，該第 一微結構262及第二微結構264的钊面可為矩形、方形、 多邊形、橢圓形、三角形、菱形或金字塔形等。 [0024] 進一步地，為提高光線出射的均勻性，分佈於同一圓弧 上的第一微結構262或第二微結構264之間應具有相同的 間距。另，可通過分別調整分佈於不同組的圓弧上的第 一微結構262或第二微結構264之間的間距，以減少第一 微結構262與第二微結構264之間的重疊，使得本實施例 導光板24可避免由於第一微結構262與第二微結構264之 間的重疊導致出光不均勻的現象。另，於第一微結構262 與第二微結構264之間的交疊處可僅設置一個第一微結構 262或第二微結構264。 095144717 表單編號A0101 第6頁/共14頁 1003128035-0 1344047 100年04月14日修正替换頁 [0025] 本領域技術人員應明白，本實施例中，分佈於不同組圓 弧上的第一微結構262及第二微結構264的分佈密度及尺 寸可改變反射面246局部區域的散射能力。通常，微結構 的分佈密度及尺寸越大，其散射能力越強。因此，為避 免導光板24上鄰近光源22的區域過亮，而遠離光源22的 區域過暗，本實施例中第一微結構262及第二微結構264 的分佈密度及尺寸可隨遠離光源22的距離的增加而增加 〇 聲 [0026] 另，為提高光出射的效率，反射面246上可設置一增反膜 (未示出），其為金屬膜或者介質膜，如鋁膜、銀膜等 。該增反膜可進一步提高反射面246及第一微結構262與 第二微結構264的反射率，另，導光板24除入光面242外 的三個側面，也可通過鍍增反膜來提高反射率。 [0027] 請參閱圖4，本發明第二實施例提供一種背光模組30，其 包括一個光源32、一個導光板34。該導光板34包括一入 光面342，一與入光面342相鄰的出光面（未標出）及一 • 與該出光面相對的反射面（未標出）。其中該反射面設 置有複數第一微結構362及第二微結構364。該光源32進 一步包括一發光面322與導光板34的入光面342相對。第 一微結構362及第二微結構364分別分佈於以入光面342 上兩條等分線324、326上的點為圓心的複數組同心圓弧 上。本發明第二實施例提供背光模組30的結構與本發明 第一實施例提供的背光模組20的結構基本相同，其區別 在於：光源32位於導光板34的一角a [0028] 本領域技術人員應明白，本發明實施例中光源的發光面 095144717 表單編號A0101 第7頁/共14頁 1003128035-0 1344047 [0029] [0030] [0031] [0032] [0033] 095144717 100年04月14日修正替换頁 也可包括兩條以上的等分線將發光面分成三個以上的等 份，根據不同的等分線，反射面可包括兩組以上的微結 構分別對應等分線設置於複數同心圓弧上。另，該背光 模組可包括複數光源及一個導光板。每個光源可包括兩 個以上等分線將發光面分成三個以上的等份，每條等分 線任取一個點。於導光板的反射面上可設置複數組分別 以這些點為圓心的同心圓弧上的微結構。或，進一步地 ，本發明實施例的複數組微結構可分佈於以光源發光面 上的任意點為圓心的複數組同心圓弧上，亦可於一定程 度上改善導光板的光出射效率及光出射均勻性。 與先前技術相比較，本發明驗光源數目 -· *·κ' * V. ·.1 ' - ,-，户..π. -... 不增加及導光板的微結構數雙勉,瘡就下，可具 有更高的光出射效率及光出射均勻性。故，該背光模組 於提高液晶顯示裝置的亮度、均勻性及降低能耗方面都 有著廣闊的應用前景 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。 「圄忒飭罝說明Ί · · !· · ··嫜 I •一 · · 圖1A係先前技術的背光模組的俯視示意圖。 圖1B係先前技術的背光模組的側視示意圖。 圖2A係本發明第一實施例的背光模組的俯視示意圖。[0018] Both ends of the concentric arc where the plurality of microstructures are located intersect the edge of the reflecting surface. [0019] Compared with the prior art, in the backlight module, the microstructure on the light guide plate is disposed on a complex array concentric arc centered on a plurality of points on the same light source emitting surface. Therefore, the backlight module can have higher light emission efficiency and light emission uniformity without increasing the number of light sources and the number of microstructures of the light guide plate. [Embodiment] Hereinafter, embodiments of the present invention will be further described in detail with reference to the accompanying drawings. [0021] Referring to FIG. 2A and FIG. 2B, a first embodiment of the present invention provides a backlight module 20 including a light source 22 and a light guide plate 24. The light guide plate 24 includes a light incident surface 242, a light exit surface 244 adjacent to the light incident surface 242, and a reflective surface 246 opposite to the light exit surface 244. The reflective surface 246 is provided with a plurality of first microstructures 262. And a second microstructure 264. The light source 22 is disposed on a side of the light incident surface 242. The light source 22 further includes a light emitting surface 222 opposite to the light incident surface 242 of the light guide plate 24. In this embodiment, the light source 22 is a light emitting diode (LED). 095144717 Form No. A0101 Page 5 of 14 1003128035-0 1344047 100 years 〇April 14 Amendment 7 [0022] The light guide plate 24 is made of a transparent material such as acrylic resin, polycarbonate, polyethylene resin or glass. Made. The light is emitted from the light-emitting surface 222 of the light source 22, enters the light guide plate 24 through the light-incident surface 242, a part of the light is directly emitted from the light-emitting surface 244, and another part of the light is transmitted through the light-guide plate 24 according to the principle of total reflection, and is reflected on the reflective surface 246. After the microstructures 262 and 264 are reflected, they are emitted by the light exit surface 244. Referring to FIG. 3 together, the light-emitting surface 222 of the light source 22 may further include two bisectors 224 and 226 perpendicular to the reflective surface 246 of the light guide plate 24 to divide the light-emitting surface 222 of the light source 22 into three equal parts. The first microstructure 262 disposed on the reflective surface 246 is distributed on a complex array concentric arc centered on any point on the bisector 224, and the second microstructure #4赍% is centered at any point on the $ line 226 The complex array concentric circles i and the first structures 262 and the second microstructures 264 may be concave or convex structures. Preferably, the first microstructure 262 and the second microstructure 264 may be scattering points or scattering grooves, and the first microstructure 262 and the second microstructure 264 may be rectangular, square, polygonal, or elliptical. Triangle, diamond or pyramid. [0024] Further, in order to improve the uniformity of light emission, the first microstructure 262 or the second microstructure 264 distributed on the same circular arc should have the same pitch. In addition, the overlap between the first microstructure 262 or the second microstructure 264 can be reduced by adjusting the spacing between the first microstructure 262 or the second microstructure 264 distributed over the arcs of different groups, such that the overlap between the first microstructure 262 and the second microstructure 264 is reduced. The light guide plate 24 of the embodiment can avoid the phenomenon that the light is uneven due to the overlap between the first microstructure 262 and the second microstructure 264. Alternatively, only one first microstructure 262 or second microstructure 264 may be disposed at the intersection between the first microstructure 262 and the second microstructure 264. 095144717 Form No. A0101 Page 6 of 14 1003128035-0 1344047 Correction Replacement Page of April 14, 2014 [0025] Those skilled in the art should understand that in this embodiment, the first micro is distributed on different sets of arcs. The distribution density and size of the structure 262 and the second microstructure 264 can change the scattering power of the local area of the reflective surface 246. Generally, the larger the distribution density and size of the microstructure, the stronger the scattering ability. Therefore, in order to avoid the area of the light guide plate 24 adjacent to the light source 22 being too bright, and the area away from the light source 22 is too dark, the distribution density and size of the first microstructure 262 and the second microstructure 264 in this embodiment may be away from the light source 22 Increasing the distance increases the click sound. [0026] In addition, in order to improve the efficiency of light emission, an antireflection film (not shown) may be disposed on the reflective surface 246, which is a metal film or a dielectric film such as an aluminum film or a silver film. Wait. The anti-reflection film can further improve the reflectivity of the reflective surface 246 and the first microstructure 262 and the second microstructure 264. In addition, the light guide plate 24 can be removed from the three sides of the light surface 242, and can also be formed by plating the anti-reflection film. Increase the reflectivity. Referring to FIG. 4, a second embodiment of the present invention provides a backlight module 30 including a light source 32 and a light guide plate 34. The light guide plate 34 includes a light incident surface 342, a light exit surface (not shown) adjacent to the light incident surface 342, and a reflective surface (not shown) opposite to the light exit surface. The reflective surface is provided with a plurality of first microstructures 362 and a second microstructure 364. The light source 32 further includes a light emitting surface 322 opposite the light incident surface 342 of the light guide plate 34. The first microstructure 362 and the second microstructure 364 are respectively distributed on a complex array concentric arc centered on a point on the two bisectors 324, 326 of the light incident surface 342. The structure of the backlight module 30 of the second embodiment of the present invention is substantially the same as that of the backlight module 20 according to the first embodiment of the present invention. The difference is that the light source 32 is located at an angle a of the light guide plate 34. [0028] Personnel should understand that the light-emitting surface of the light source in the embodiment of the present invention is 095144717. Form No. A0101 Page 7/14 pages 1003128035-0 1344047 [0030] [0032] [0033] 095144717 April 14, 100 The modified replacement page may also include two or more bisectors to divide the illuminating surface into three or more aliquots. According to different bisectors, the reflecting surface may include two or more micro-structures respectively corresponding to the bisectors disposed at the plurality of concentric lines. On the arc. In addition, the backlight module can include a plurality of light sources and a light guide plate. Each light source may include more than two bisectors to divide the illuminating surface into three or more aliquots, one for each bisector. On the reflective surface of the light guide plate, a complex array of microstructures on concentric arcs centered on these points can be set. Or, further, the complex array microstructure of the embodiment of the present invention may be distributed on a complex array of concentric arcs with any point on the light-emitting surface of the light source as a center, and may also improve the light-emitting efficiency and light of the light guide plate to some extent. Emission uniformity. Compared with the prior art, the number of light sources of the present invention -· *·κ' * V. ··1 ' - , -, household .. π. -... does not increase the number of microstructures of the light guide plate, double sputum, sore In the following, it is possible to have higher light emission efficiency and light emission uniformity. Therefore, the backlight module has broad application prospects in improving the brightness, uniformity and energy consumption of the liquid crystal display device. 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 description 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 those skilled in the art to the spirit of the invention are intended to be included within the scope of the following claims. 1A is a top plan view of a prior art backlight module. Fig. 1B is a side view of a prior art backlight module. A schematic top view of a backlight module according to a first embodiment of the present invention.
表單編號A0101 第8頁/共14頁 1003128035-0 1344047 100年04月14日梭正替换頁 [0034] 圖2B係本發明第一實施例的背光模組的側視示意圖。 [0035] 圖3係本發明第一實施例的背光模組的光源發光面的示意 圖。 [0036] 圖4係本發明第二實施例的背光模組的俯視示意圖。 【主要元件符號說明】 [0037] 背光模組：10、20、30 [0038] 光源：12、22、32 | [0039] 導光板：14、24、34 [0040] 入光面：142、242、342 [0041] 出光面：144、244 [0042] 反射面：146、246 [0043] 第一微結構：162、262、362 [0044] 第二微結構：264、364 ) [0045] 發光面：222、322 [0046] 等分線：224、226、324、326 095144717 表單編號A0101 第9頁/共14頁 1003128035-0Form No. A0101 Page 8 of 14 1003128035-0 1344047 Shuttle Order Replacement Page [0034] FIG. 2B is a side elevational view of the backlight module of the first embodiment of the present invention. 3 is a schematic view showing a light-emitting surface of a light source of a backlight module according to a first embodiment of the present invention. 4 is a top plan view of a backlight module according to a second embodiment of the present invention. [Main component symbol description] [0037] Backlight module: 10, 20, 30 [0038] Light source: 12, 22, 32 | [0039] Light guide plate: 14, 24, 34 [0040] Light-in surface: 142, 242 342 [0041] Light-emitting surface: 144, 244 [0042] Reflecting surface: 146, 246 [0043] First microstructure: 162, 262, 362 [0044] Second microstructure: 264, 364) [0045] :222,322 [0046] bisector: 224, 226, 324, 326 095144717 Form No. A0101 Page 9 / Total 14 Page 1003128035-0