200947055 九、發明說明： 【發明所屬之技術領域】 本發明係關於一種背光模組’特別是一種直下式的背光模經。 【先前技術】 背光模組根據光源設置於液晶顯示器的位置，可分為兩種， 一種係側光式背光模組，另一種係直下式背光模組。側光式背光 板組的光源係設置於液晶顯不器的侧板，且光源所發出的光線由 © 導光板的侧邊射入導光板内，經由導光板的轉化為一平面光，再 經由導光板上方的擴散板和反射層等將光線照射於液晶面板。相 對地，直下式背光模組之光線係經由反射層及擴散板混光成一平 面光後’直接照射於液晶面板。 相關技術請參閱美國專利第US6654088 B2號和美國公開 US2007/0147035A1 號等。 直下式背光模組會在光源與擴散板間之區域先行混光後，再 ❹由擴散板將光線擴散成-平面光。由於不同類型光源的發光特性 (例如.無‘向性光源和指向性光源等），一般而言混光後再經過 擴散板擴散後’往往仍有亮度不均（muj>a)、亮暗帶的問題。 【發明内容】 小一本發明揭露—種背光模組包含有：-底座、至少-光源、至 ^一導光遮罩與擴散板。底座具有-底板及-侧壁，光源位於底 光、、方< 用以發射光線。導光遮罩設置於底板上且覆蓋光源。導 部·^又置有至）_光擴散部，光擴散部用以擴散入射至光擴散 '線擴散板位於導光遮罩相對於光源之另一側，其中在擴 5 200947055 放板與導光遮罩間形成一混光區域，從導光遮罩射出之光線在混 光區域進行混光並入射至擴散板後，由擴散板將入射之光線擴散。 - 本發明揭露之背光模組更可以包含有—反射層，設置於底座 . 與光源之間’更進一步可設置於底板與側壁上。 有關本發_特徵與實作，賊合圖示作最佳實施例詳細說 明如下。 【實施方式】 ❹ 「第1圖」係為本發明之背光模組之第一實施例的示意圖。 請參照「第1圖」’於本實施例中，背光模組1〇包含有：底座1〇〇、 至少一光源200、至少一導光遮罩3〇〇與擴散板4〇〇，圖中可以見 悉此背光模組10係為一直下式背光模組。 底座100係具有底板110及側壁12〇。側壁12〇相鄰於底板 110。換5之’側壁120連接於底板no的側邊上。側壁12〇與底 板110之間夾一角度13〇。侧壁12〇與底板11()之間夾設的角度 ❿130可以係介於9〇度至170度。底座100的材質可以選用金羼或 合金等具有反射光線效果的材料（例如鋁、鋁鎂合金等）或選用 塑膠等易於製程加工成型的材料。 光源200位於底板110上方，用以發射光線。光源2〇〇係一 種無心向丨生光源，例如.冷陰極管（C〇id Cathode Fluorescent Lamp CCFL)和熱陰極管（H〇t Cathode Fluorescent Lamp， HCFL)等。無指向性光源的發光特性’係指在光源2〇〇發光面上 每一點，所發出之光線在各個角度都是具有相近的亮度。 導光遮罩300設置於底板11〇上且覆蓋光源2〇〇。換言之， 200947055 導光遮罩300罩設於底板110上，使光源200被罩設在其與底板 no之間。其中，導光遮罩300係為透明材質，例如： (PolyMethyl MethAciylate )或 PC ( Poly Carbonate )等。導光遮 罩300具有光穿透或光散射的光學特性。其中，導光遮罩3〇〇可 以係利用射出成型或壓鑄成型等製程方法製作。並且，當使用多 個導光遮罩300時，該些導光遮罩300可以單一結構的方式個別 製成以分別覆蓋單一或複數個光源2〇〇，或是以一體成型的方式 _ 製成以覆蓋複數個光源2〇〇。 導光遮罩300的形狀係隨著不同類型的光源2〇〇的發光特性 不同而有不同的變化。 請參照「第1圖」，於本實施例中，光源㈣係為無指向性之 光源’例如冷陰極管(CCFL)，導光遮罩·對應光源2〇〇之内側 面301，係為-曲面狀以對應光源·的發光面形狀，使光源施 所發出之光線人射_面3G1時，每道光_係接近垂直入射於 _㈣。導光遮罩之外側面搬的形狀可以係角柱狀，、 或曲面狀等幾何形狀。 种，隨著光源2〇〇的特性不同，導光遮罩· ^ 步汉置有至少一光擴散部31〇。其中， TZ 300 200 C 彍政部310係能部份穿透、邱也 反射，使得反射之光線於導光遮罩 σ . 光擴散效果。 _遞轉出射，以增办 200947055 於本實施例中，導光遮罩3〇〇係覆蓋於複數個無指向性的光 源200 (在本實施例中’係指冷陰極管）上。位於相鄰光源· 之間的區域，由於會同時接收到來自多個光源的光線，因此 '相較於光源200的上方（大致上只接收到單-光源所發出的 光線）會有較強的亮度。 口此/參"’、帛1圖」’於本實施射，無指向性的光源 2〇0上方係為亮度相對較低處，光擴散部训位於導光遮罩· |>對應於無指向性的光源上方周邊位置，對應介於兩光源· 間之區域’將該區域之入射光經光擴散部310擴散而出導光遮罩 300，用崎低無指向性的光源彼此之間的亮度。 光擴散部310可藉由於導光遮罩3〇〇之内側面3〇ι和/或外側 面302上形成喷墨網點或圖案而形成，也可藉由於導光遮罩· 之内側面姻和/或外侧面3〇2上形成複數個内凹或外凸的幾何結 構而形成’當然也可_在導光縣· _財於欲形成光擴 ❹散部310的部位添加入擴散粒子而形成。因為導光遮罩3〇〇係」 -透光材質’因此可進一步在導光遮罩·欲光穿透處之内侧面训 和/或外侧面302表面上做磨光平滑處理，以避免因為内側面3〇ι 和/或外側面302的表面粗糙而造成光散射。 +換言之’光擴散部310村設置於導光遮罩3〇〇之整健域， 藉由控，光擴散部310之網點、凹凸幾何結構或擴散粒子的尺寸 大小或密度分佈，以使光源細強度分佈相對較高之區域的光入 射至導光遮罩300後擴散程度較強，而光源200強度分佈相對較 低之區域的光入射至導光遮罩3〇〇後擴散程度較弱，用以提升出 8 200947055 射導光遮罩300之光強分佈均勻度，也就是說，光擴散部310位 於‘光遮罩300之整個區域，而此種光擴散部31〇係具有複數個 '光擴散結構’該光擴散結構係選自於由網點'凹凸幾何結構及光 .擴散粒子的組合中的至少-個，因此光擴散部31〇位於承接亮度 較強之該光線處的複數個光擴散結構的密度係高於該光擴散部位 於承接亮度較弱之該光線處的減個光擴散結構的密度。 擴散板400位於導光遮罩300相對於光源200之另一侧，即 _面向於‘光遮罩300的外側面302。於此，擴散板4〇〇可設置於 側J 120上，即設置於側壁12〇相對連接底板n〇的另一端上。 在擴散板400與導光遮罩3〇〇間會形成一混光區域，使從導光遮 罩300射出之光線在混光區域混光後，入射至擴散板4〇〇内，以 由擴散板400再進一步將光線擴散。 擴散板400係為透明材質，例如：pMMA (p〇tyMethyi200947055 IX. Description of the Invention: [Technical Field of the Invention] The present invention relates to a backlight module', particularly a direct type backlight mold. [Prior Art] The backlight module can be divided into two types according to the position of the light source disposed on the liquid crystal display, one is a side-light type backlight module, and the other is a direct-type backlight module. The light source of the edge-lit backlight group is disposed on the side plate of the liquid crystal display device, and the light emitted by the light source is incident into the light guide plate from the side of the light guide plate, and is converted into a plane light through the light guide plate, and then A diffusing plate, a reflective layer, or the like above the light guide plate illuminates the liquid crystal panel. In contrast, the light of the direct type backlight module is lighted by a reflective layer and a diffusing plate to form a flat surface light, and is directly irradiated to the liquid crystal panel. For related art, please refer to U.S. Patent No. 6,654,088 B2 and U.S. Publication No. US 2007/0147035 A1. The direct-lit backlight module mixes the light between the light source and the diffuser, and then diffuses the light into a flat light. Due to the illuminating properties of different types of light sources (for example, no directional light source and directional light source, etc.), generally after mixing and diffusing through the diffusion plate, there is often uneven brightness (muj>a) and bright and dark bands. The problem. SUMMARY OF THE INVENTION The first disclosure of the present invention discloses a backlight module comprising: a base, at least a light source, a light guide mask and a diffuser. The base has a bottom plate and a side wall, and the light source is located at the bottom light, and the square is used to emit light. The light guiding mask is disposed on the bottom plate and covers the light source. The guide portion is further disposed with a light diffusing portion, and the light diffusing portion is used for diffusing the incident light to the light diffusing plate. The light diffusing plate is located on the other side of the light guiding mask relative to the light source, wherein the plate and the guide are expanded. A light-mixing region is formed between the light-shielding regions, and the light emitted from the light-guiding mask is mixed in the light-mixing region and incident on the diffusing plate, and the incident light is diffused by the diffusing plate. The backlight module disclosed in the present invention may further include a reflective layer disposed on the base and between the light source and further disposed on the bottom plate and the sidewall. The best embodiment of the present invention is described below in detail with respect to the present invention. [Embodiment] FIG. 1 is a schematic view showing a first embodiment of a backlight module of the present invention. Referring to FIG. 1 , in the embodiment, the backlight module 1 includes a base 1 , at least one light source 200 , at least one light guide mask 3 , and a diffusion plate 4 . It can be seen that the backlight module 10 is a continuous backlight module. The base 100 has a bottom plate 110 and side walls 12A. The side wall 12 is adjacent to the bottom plate 110. The side wall 120 of the '5' is connected to the side of the bottom plate no. The side wall 12A and the bottom plate 110 are at an angle of 13 turns. The angle ❿130 between the side wall 12〇 and the bottom plate 11() may be between 9 degrees and 170 degrees. The material of the base 100 may be a material having a light-reflecting effect such as a metal or an alloy (for example, aluminum, aluminum-magnesium alloy, etc.) or a material which is easily processed by a plastic or the like. The light source 200 is located above the bottom plate 110 for emitting light. The light source 2 is a non-centering twin light source, such as a C〇id Cathode Fluorescent Lamp CCFL and a H〇t Cathode Fluorescent Lamp (HCFL). The illuminating property of the non-directional light source means that at every point on the light-emitting surface of the light source 2, the emitted light has similar brightness at various angles. The light guiding mask 300 is disposed on the bottom plate 11〇 and covers the light source 2〇〇. In other words, the 200947055 light-guiding mask 300 is placed over the bottom plate 110 such that the light source 200 is shielded between it and the bottom plate no. The light guide mask 300 is made of a transparent material, such as (PolyMethyl MethAciylate) or PC (Poly Carbonate). The light guiding mask 300 has optical characteristics of light penetration or light scattering. Among them, the light guide mask 3 can be produced by a process such as injection molding or die casting. Moreover, when a plurality of light guiding masks 300 are used, the light guiding masks 300 may be individually formed in a single structure to cover a single or a plurality of light sources 2〇〇, respectively, or in an integrally formed manner. To cover a plurality of light sources 2 〇〇. The shape of the light guiding mask 300 varies with the luminescent characteristics of different types of light sources 2〇〇. Referring to FIG. 1 , in the present embodiment, the light source (4) is a light source having no directivity, such as a cold cathode tube (CCFL), and the inner side surface 301 of the light guide mask corresponding to the light source 2 is - The shape of the curved surface corresponds to the shape of the light-emitting surface of the light source, and when the light emitted by the light source is emitted to the surface 3G1, each light is incident on the vertical _ (four). The shape of the side surface of the light guiding mask can be a prismatic shape, or a curved shape. According to the characteristics of the light source 2〇〇, the light guiding mask has at least one light diffusing portion 31〇. Among them, the TZ 300 200 C 彍 部 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 310 _Recursive exit to add 200947055 In the present embodiment, the light guide mask 3 is covered on a plurality of non-directional light sources 200 (in this embodiment, referred to as cold cathode tubes). The area between adjacent light sources, because it receives light from multiple light sources at the same time, is stronger than the upper part of the light source 200 (substantially only receiving the light emitted by the single-light source). brightness. The mouth/parameter"', 帛1 map"' is shot in this embodiment, the non-directional light source 2〇0 is above the relatively low brightness, and the light diffusing part is located at the light guiding mask·|> The peripheral position above the light source having no directivity corresponds to the region between the two light sources. The incident light of the region is diffused through the light diffusing portion 310 to exit the light guiding mask 300, and the light source with low and non-directional light is used between each other. Brightness. The light diffusing portion 310 may be formed by forming an inkjet dot or pattern on the inner side surface 3〇 and/or the outer side surface 302 of the light guiding mask 3, or by the inner side of the light guiding mask. Or forming a plurality of concave or convex geometric structures on the outer side surface 3〇2 to form 'of course, it is also possible to add diffusion particles to the portion where the light-expanding and diverging portion 310 is to be formed. . Because the light-shielding mask 3"-transparent material" can be further smoothed on the inner side of the light-guiding mask and the light-transmitting side and/or the surface of the outer side surface 302 to avoid The surface of the inner side 3〇 and/or the outer side 302 is rough to cause light scattering. + In other words, the light diffusing portion 310 is disposed in the entire health domain of the light guiding mask 3, by controlling the size of the dot, the concave-convex geometry or the diffusion particle size or density distribution of the light diffusing portion 310, so that the light source is thin. When the light having a relatively high intensity distribution is incident on the light guiding mask 300, the light is diffused to a greater extent, and the light having a relatively low intensity distribution of the light source 200 is incident on the light guiding mask, and the degree of diffusion is weak. To enhance the uniformity of light intensity distribution of the light-transmitting light mask 300 of the 200947055, that is, the light diffusing portion 310 is located in the entire area of the light mask 300, and the light diffusing portion 31 has a plurality of 'lights The diffusing structure 'the light diffusing structure is selected from at least one of a combination of a dot-and-groove geometry and a light-diffusing particle, so that the light diffusing portion 31 is located at a plurality of light diffusions that receive the light having a stronger brightness The density of the structure is higher than the density of the reduced light diffusing structure where the light diffusing portion is located at the light source that receives the weaker brightness. The diffuser plate 400 is located on the other side of the light guide mask 300 with respect to the light source 200, i.e., facing the outer side 302 of the light mask 300. Here, the diffusion plate 4A may be disposed on the side J 120, that is, on the other end of the side wall 12〇 opposite to the connection bottom plate n〇. A light mixing region is formed between the diffusion plate 400 and the light guiding mask 3, and the light emitted from the light guiding mask 300 is mixed in the light mixing region, and then incident into the diffusion plate 4 to be diffused. The plate 400 further diffuses the light. The diffusion plate 400 is made of a transparent material, for example: pMMA (p〇tyMethyi
MethAcrylate)或 pc (PGlyCarbonate)等。擴散板 _ 可以係利 ❹用射出成型或麗鑄成型等製程方法製作。其中，擴散板4〇〇可為 透明基板之外侧φ 401 (和内側面）上形成有複數個喷墨網點或 圖案，也可為透明基板之外侧面4〇1和/或内侧面4〇2上形成有複 數個内凹或外凸的幾何結構。當然，擴散板也可以係為在透 明基板的製程中添加入擴散粒子。 由於光源200所發出之光線’一部份光線入射導光遮罩， 另一部份光線則射向底座1〇〇。並且，在光線入射至導光遮罩3〇〇 與擴散板400的過程中，亦會有部分光線被導光遮罩3〇〇與擴散 板400表面反射向底座，因此為有效利用光能，於本實施例中， 9 200947055 月光模’、且10更包έ有反射層5〇〇。反射層5⑼設置於底座與 光源200之間。於此’反射層5〇〇可覆蓋於絲ιι〇與側壁⑽ 上即反射層500可覆盍於底板11〇與罐12〇鄰近光源綱的 •内側表面h其中，反射層咖可為一反射片，或是塗佈於底板 110與側壁120表面上的反射材料。在底板n〇或側壁為可透 光的結構下’反射層500亦可設置於底板11〇之下或側壁12〇之 外側。 φ 反射層500的基材可以係聚對苯二甲酸乙二酷（PolyethyleneMethAcrylate) or pc (PGlyCarbonate), etc. The diffusion plate _ can be made by a process such as injection molding or smelting. Wherein, the diffusion plate 4〇〇 may be formed with a plurality of inkjet dots or patterns on the outer side φ 401 (and the inner side surface) of the transparent substrate, or may be the outer side surface 4〇1 and/or the inner side surface 4〇2 of the transparent substrate. A plurality of concave or convex geometric structures are formed thereon. Of course, the diffusion plate may be incorporated with diffusion particles in the process of transparent substrate. Since part of the light emitted by the light source 200 is incident on the light guide mask, another part of the light is directed toward the base 1 . Moreover, in the process of the light being incident on the light guiding mask 3 〇〇 and the diffusing plate 400, some light is also reflected by the light guiding mask 3 〇〇 and the surface of the diffusing plate 400 toward the base, so that the light energy is effectively utilized. In this embodiment, 9 200947055 monthly light mode ', and 10 is further covered with a reflective layer 5 〇〇. The reflective layer 5 (9) is disposed between the base and the light source 200. Here, the 'reflective layer 5' can be covered on the ιι 〇 and the side wall (10), that is, the reflective layer 500 can be covered on the bottom plate 11 〇 and the can 12 〇 adjacent to the light source of the inner side surface h, wherein the reflective layer can be a reflection A sheet, or a reflective material applied to the surface of the bottom plate 110 and the side wall 120. The reflective layer 500 may also be disposed under the bottom plate 11〇 or outside the side wall 12〇 under the structure in which the bottom plate or the side wall is permeable to light. The substrate of the φ reflective layer 500 can be polyethylene terephthalate (Polyethylene)
Terephthahte ’ PET)，並且在基材上塗佈有白色擴散粒子，用以 將入射之光線反射。 於本貫施例中’背光模組1〇，將導光遮罩3〇〇設置於底板ιι〇 上且覆盍無指向性的光源200。在導光遮罩3〇〇上，針對無指向 性的光源2GG的發絲性，設計光舰部31Q，致使無指向性的 光源200的正上方所發出之光線可穿透導光遮罩3〇〇，而無指向 ^ 性的光源200朝向兩側上方所發之光線則先行被擴散後，再穿透 導光遮罩300。如此一來，於光線穿透導光遮罩3〇〇後，會先藉 由導光遮罩300而初步地均勻化，再於導光遮罩3〇〇與擴散板4卯 之間的混光區域403進一步的混光，由於導光遮罩3〇〇初步將光 源200的光線強度打散，故可進一步縮短混光區域4〇3，相對於 導光遮罩的厚度，該混光區域約可縮短至5.5〜〇·5倍的範圍，然 後再藉由擴散板400進一步均勻化光線。 「第2圖」係為本發明之背光模組的第二實施例的示意圖。 請參照「第2圖」，本實施例的結構設計大致上可通用上述實施 10 200947055 例，差別在於本實施例所使用的光源200可為指向性的光源，例 如：發光二極體（Light Emitting Diode，LED )、雷射二極體(Laser 、 Diode，LD)或場發射顯示器（Field Emission Display，FED)等。 、 指向性的光源的發光特性，係指在光源200的發光面上每一點， 所發出之光線的亮度匯集中於特定角度範圍内，在特定角度範圍 外的亮度相對之下會較弱。 以才曰向性之發光二極體作為光源2〇〇為例，於本實施例中， _ V光遮罩300對應光源200之内側面301包含有平行面301a與侧 面屬。平行面3〇la大致平行於光源200的發光面。側面301b 則分別垂直連接於平行面301a的一側。導光遮罩3〇〇之外側面 302的形狀可以係角柱狀，#純可以係呈現曲面狀等幾何形狀。 其中’導光遮罩300之外侧面3〇2的形狀係隨著光源2〇〇特性不 同而有不同的變化。 導光遮罩300係設置於底板11〇上且覆蓋於指向性的光源2〇〇 謇上。導光遮罩300包含有至少一光擴散部31〇。於此，光擴散部 310 K树置亦係隨著光源·的特性不同而有不同的變化。 其中’導光遮罩300 #光擴散部31(M系位於導光遮罩3〇〇且對應 光源200所發出之光線的免度相對較高處，以使入射導光遮罩· 之规概，纽是說’光驗部31()絲部份紐、部份反射， 使得反射之光線於導光遮罩__遞並再出射，以增加光擴散 效果。 ^ 於本只化例_ ’由於指向性的光源2〇〇所發出的光會集中於 上f在指向㈣統的上方錢較強的亮度。因此， 200947055 光擴散部細分佈於導光鮮的位置係對應於指肖性的光源 200的上方，由細性的絲上方之絲散部⑽將指向性的光 • 源所發出之光線讎，以降低指·的光源2GG上方的光亮度。 導光遮罩獨可以係利用射出成型或麼鑄成型等製程方法製 ，、。並且，當使用多個導光遮罩時，此些導光遮罩可以 體麵的方絲成謂蓋複數她向性的細·，或是 單-結構的方式_製成以覆蓋單—或複數個指向性的光源 ❹〇〇。其中’單一結構的方式個別製成以覆蓋單-指向性的光源 200亦即導光遮罩以—對—的方式罩設光源，如「第3圖」 所示。 於本只施例中’月光权組1〇，將導光遮罩設置於底板11〇 ^且覆蓋指向性的光源200。在導光遮罩勤上，針對指向性的 沾原2〇〇的發光特性設計光擴散部31〇，致使指向性的光源· 扣正上方所發出之光線被擴散後，再穿透導光遮罩勤，以降低 ❹=!·生的光源200的上方的光亮度，而導光遮罩未設置光擴 請參照「第4Α圖」、「第4Β圖」與「第4C圖 • L卩31G之區域貞_向性的光源在特定肖度範m外所發出 '心叙光線直接穿透導光麟。如此—來，於光線穿透導 =麵後，會先藉由導光料期_步地均勻化，再於導 ^罩3〇0與擴散板_之間的混光區域進一步的混光，由於導 2 300㈤步將光源2〇〇的光線強度打散，故可進一步縮短混 ^域彻，相對於導光遮罩的厚度，該混光區域彻約可縮短 .5〜〇·5倍的範圍’然後再藉由擴散板400進-步均勻化光線。 語垒昭「笛/1 A mTerephthahte ' PET) and coated with white diffusing particles on the substrate to reflect incident light. In the present embodiment, the backlight module 1 is disposed on the substrate ιι and covers the non-directional light source 200. On the light guiding mask 3, the light ship portion 31Q is designed for the hairiness of the non-directional light source 2GG, so that the light emitted directly above the non-directional light source 200 can penetrate the light guiding mask 3 The light emitted by the light source 200 having no pointing direction toward the upper side is diffused first and then penetrates the light guiding mask 300. In this way, after the light passes through the light-shielding mask 3, it is firstly homogenized by the light-guiding mask 300, and then mixed between the light-shielding mask 3〇〇 and the diffusion plate 4卯. The light region 403 is further mixed, and the light intensity of the light source 200 is initially dissipated due to the light guiding mask 3〇〇, so that the light mixing region 4〇3 can be further shortened, relative to the thickness of the light guiding mask, the light mixing region It can be shortened to a range of 5.5 to 〇·5 times, and then the light is further homogenized by the diffusion plate 400. Fig. 2 is a schematic view showing a second embodiment of the backlight module of the present invention. Referring to FIG. 2, the structural design of the present embodiment is substantially exemplified by the above-mentioned implementation 10 200947055. The difference is that the light source 200 used in this embodiment can be a directivity light source, for example, a light emitting diode (Light Emitting) Diode, LED), laser diode (Laser, Diode, LD) or Field Emission Display (FED). The illuminating property of the directional light source means that at each point on the illuminating surface of the light source 200, the brightness of the emitted light is concentrated in a specific angle range, and the brightness outside the specific angle range is relatively weak. For example, in the embodiment, the inner surface 301 of the light source 200 corresponding to the light source 200 includes a parallel surface 301a and a side surface genus. The parallel faces 3〇la are substantially parallel to the light emitting face of the light source 200. The side faces 301b are vertically connected to one side of the parallel faces 301a, respectively. The shape of the outer side surface 302 of the light guiding mask 3 can be a columnar shape, and the # pure can be a geometric shape such as a curved surface. The shape of the outer side surface 3〇2 of the light guiding mask 300 varies differently depending on the characteristics of the light source 2〇〇. The light guiding mask 300 is disposed on the bottom plate 11〇 and covers the directional light source 2〇〇. The light guiding mask 300 includes at least one light diffusing portion 31A. Here, the light diffusing portion 310 K is also differently changed depending on the characteristics of the light source. Wherein the 'light guide mask 300 # light diffusing portion 31 (M is located in the light guide mask 3 〇〇 and corresponds to the relatively high degree of freedom of the light emitted by the light source 200 to make the incident light guide mask) , New is saying that 'the light inspection part 31 () silk part of the New Zealand, part of the reflection, so that the reflected light in the light guide mask __ hand and then out to increase the light diffusion effect. ^ In this example only _ ' Since the light emitted by the directional light source 2 集中 is concentrated on the upper side of the light pointing to the (four) system, the brightness of the light diffusing portion is finely distributed in the light guiding position corresponding to the light source. Above the 200, the light emitted by the directional light source is smashed by the filament portion (10) above the fine wire to reduce the brightness of the light above the light source 2GG of the finger. The light guide mask can be formed by injection molding. Or a molding process such as casting, and, when using a plurality of light-shielding masks, such light-guiding masks can be decently covered with a plurality of her directional thinness, or single- The way the structure is made to cover a single- or multiple directional light source ❹〇〇. The method is separately formed to cover the single-directional light source 200, that is, the light-guiding mask is covered with a light source, as shown in "Fig. 3". In the present example, 'moonlight right group 1 〇, the light-shielding portion is disposed on the bottom plate 11 and covers the directivity light source 200. In the light-guiding mask, the light-diffusing portion 31 is designed for the light-emitting characteristics of the directivity of the directivity, causing the pointing Slight source · The light emitted from the front of the buckle is diffused, and then penetrates the light guide mask to reduce the brightness of the light source 200 above the light source, and the light guide is not set. Refer to "4th map", "4th map" and "4C map". The area of the L卩31G 贞 directional light source is emitted outside the specific slanting range m. The illuminating light directly penetrates the light guiding lin. - After the light penetrates the conduction surface, it will first be homogenized by the light guiding period, and then further mixed with the light mixing region between the conductive cover 3〇0 and the diffusion plate _ Guide 2 300 (5) steps to break the light intensity of the light source 2 ,, so that the mixing region can be further shortened, relative to the thickness of the light guiding mask, the light mixing region The Rough can shorten the range of .5 to 〇·5 times' and then homogenize the light by the diffusion plate 400. The vocabulary is "Flute / 1 A m
J 12 200947055 「弟4A圖」係為習知之直下式背光模組的示意圖。於此直 下式背光模組中，設置有24支冷陰極管2Q1，且冷陰極管2〇ι之 間的間距為21公厘（mm)。 參 「第4B圖」係為另一習知之直下式背光模組的示意圖。於此 直下式背光模組中，相較「第4A圖」所示之直下式背光模组， 減少了所個的冷陰極管的數目。於此，係設置有16支冷陰極管 2(H ’「且冷陰極管2〇1之間的間距為32·3公厘（馳）。 「弟4C圖」係為根據本發明之f光模組的細的示意圖。於 此應用中’背光模組中設置有16支冷陰極管加，且冷陰極管加 之間的間距為32.3公厘n植， _ . ^里（mm)，且導光遮罩300係覆蓋於16支 冷陰極管2(Π上。其中，擴散板距底座的距離可為2公分，且導 光遮罩的外側高點與底絲面之間的轉可為〗公分。 第5圖」，「第5圖」係為習知定義背光 通 ΓΓ度軌崎啦_。背光歓亮朗勻性的定義方式一 般疋將該背光模組分多個區域點 、 區域點或25個區_ )。如—「第5圖1 _ 9個區域點、13個 為㈣光增在長度為W且寬度 並由該些區域點測得之最大亮=域點的亮度’ 量均句Λ、 又1酿，、取小壳度ι襲定義出光通 勺2、5、§的區域點係位於背 的中間位置，與長度兩端距離為·，i 2二7度， 的寬度一端距離為D/ι〇。在中門 ’手、为別”所罪近 光模組的寬度兩端的中間位置，於、6的區域點係位於背 與見度兩端距離為D/2,且4和6 13 200947055 係分別與所靠近的長度—端距離為 W/10。靠近4個角的1、3、7、 9 ir、刀另L、所罪近的長度一端距离隹聰〇、與寬度一端距離。 請翔、「第6A圖」、「第6B圖」與「第6C圖」。 第 图」係為「第4A圖」在兩公分混光高度的ASAP模 擬結果。棚中可以看^光通量的均勻度大於娜。 第6B圖」係為「第4B圖」在兩公分混光高度的ASAP模 擬結果，由圖中可以看出光通量的均勻度大於80%。 「第6C圖」係為「第4C圖」在兩公分混光高度的ASAP模 擬結果，由圖中可以看出光通量的均勻度大於。 由「第6Α®」、「第6B圖」與「第6C圖」可以看出，在相 同的混光距離内，減少光源的數目，會降低光通量的均勻度，造 成明顯的亮度不均（mura)。當在減少光源的數目時，在光源上覆 蓋導光遮罩，能有效的使光通量的均勻度提高，達到未減少光源 數目的均勻化平面光的效果。 請參照「第7A圖」與「第7B圖」。 「第7A圖」係為習知使用發光二極體之直下式背光模組的 示意圖。其中，設置有複數個發光二極體2〇2。 「第7B圖」係為根據本發明之背光模組的另一應用的示意 圖。其中，導光遮罩3〇〇係覆蓋於複數個發光二極體2〇2上。. 請參照「第8A圖」與「第8B圖」。 「第8A圖」係為「第7A圖」在兩公分混光高度的ASAp模 擬結果。 「第8B圖」係為「弟7B圖」在兩公分混光高度的ASAp模 14 200947055 擬結果。 内二弟8A圖」與「第8B圖」可以看出，在相同的混光距離 光源上覆盖導光遮罩，能有效的使光通量的 ❹J 12 200947055 "Dia 4A" is a schematic diagram of a conventional direct type backlight module. In the direct-lit backlight module, 24 cold cathode tubes 2Q1 are provided, and the distance between the cold cathode tubes 2〇 is 21 mm. Refer to "Fig. 4B" as a schematic diagram of another conventional direct type backlight module. In the direct type backlight module, the number of cold cathode tubes is reduced compared to the direct type backlight module shown in "Fig. 4A". Here, 16 cold cathode tubes 2 are provided (H'" and the distance between the cold cathode tubes 2〇1 is 32·3 mm (Chi). The "4C diagram" is the light according to the present invention. A detailed schematic diagram of the module. In this application, there are 16 cold cathode tubes added in the backlight module, and the spacing between the cold cathode tubes is 32.3 mm n, _ . ^ 里 (mm), and The light mask 300 is covered on 16 cold cathode tubes 2 (the upper surface of the light guide mask can be 2 cm away from the base, and the transition between the outer high point of the light guide mask and the bottom surface can be The 5th figure, the "5th figure" is a conventional definition of the backlight ΓΓ 轨 啦 。. The definition of the backlight 歓 朗 疋 疋 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓 歓Or 25 zones _). For example - "5th Figure 1 _ 9 area points, 13 (4) light increase in length W and width and the maximum brightness measured by the area points = the brightness of the domain point" The average sentence is Λ, and 1 is brewed, and the small shell degree is used to define the light pass spoon 2, 5, § The area point is located in the middle of the back, and the distance from the end of the length is ·, i 2 2 7 degrees, the width One The distance is D/ι〇. In the middle position of the width of both ends of the low-light module of the 'hand and the other' in the middle door, the distance between the two points in the area of 6 is at D/2 at both ends of the back and the visibility, and 4 and 6 13 200947055 are respectively close to the length-end distance of W/10. Near the 4 corners 1, 3, 7, 9 ir, the knife is L, the length of the sin is near the end of the distance, Width at one end. Please, "6A", "6B" and "6C". The first picture is the "A4" in the ASAP simulation result of the two-centimeter mixing height. ^The uniformity of luminous flux is greater than Na. Figure 6B is the ASAP simulation result of the "B2B" in the two-centimeter mixed light height. It can be seen from the figure that the uniformity of luminous flux is greater than 80%. "6C" For the ASAP simulation results of the "C4C" at a height of two centimeters, it can be seen from the figure that the uniformity of the luminous flux is greater than. It can be seen from "6th Α®", "6B" and "6C" In the same light mixing distance, reducing the number of light sources will reduce the uniformity of luminous flux, resulting in significant brightness unevenness (mura). When the number of light sources is reduced, the light guide mask is covered on the light source, and the uniformity of the luminous flux can be effectively improved to achieve the effect of uniformizing the planar light without reducing the number of light sources. Please refer to "7A" and "7B". "FIG. 7A" is a schematic diagram of a conventional direct type backlight module using a light-emitting diode, in which a plurality of light-emitting diodes 2 〇 2 are provided. "Block 7B" is according to the present invention. A schematic diagram of another application of the backlight module, wherein the light-shielding mask 3 is covered on a plurality of light-emitting diodes 2〇2. Please refer to "8A" and "8B". The 8A map is the result of the ASAp simulation of the "6A map" at a two-centimeter blending height. "Picture 8B" is the result of the ASAp model 14 200947055 of "Different 7B diagram" at a height of two centimeters. It can be seen that the inner second brother 8A map and the "8B map" can cover the light guide mask on the same light-mixing distance source, which can effectively make the light flux ❹
=本發明所揭露之背光模組，藉由導光遮科打 城光。如此—來，—方面可以在極小的混光距離内， _先讀術所f要之較大的絲距離找得_勻化平面光的 ，果，進而可以大幅縮小液晶顯示器的厚度H面可以在相 】的，光距_，減少光_數目，卻也能達·前技術所使用 的均勻化平面光的效果，進而可以降低成本與節能。 —雖然本發明哺述之較佳實施·露如上，然其並非用以限 疋本^ ’任何熟習相紐藝者，在不麟本發明之精神和範圍 田可作i許之更動與潤飾，因此本發明之專利保護範圍須視 本說明書_之申請專利麵所界定者為準。 【圖式簡單說明】 第1圖係為本發明之背光模組的第一實施例的示意圖； 第2圖係為本發明之背光模組的第二實施例的示意圖； 第3圖係為本發明之背光模纽的第三實施例的示意圖； 第4A圖係為習知之背光模組的示意圖； 第4B圖係為另—習知之背光模組的示意圖； 第4C圖係為根據本發明之背光模組的應用的示意圖； 第5圖係為習知定義背光模組之光通量均勻度的九點量測示 意圖； 第6A圖係顯示「第4A圖」所示之背光模組在兩公分混光高 15 200947055 度的ASAP模擬結果； 第6B圖係顯示「第4B圖」所示之背光模組在兩公分混光高 度的ASAP模擬結果； 第6C圖係顯示「第4C圖」所示之背光模組在兩公分混光高 度的ASAP模擬結果； 第7A圖係為又另一習知之背光模組的示意圖； 第7B圖係為根據本發明之背光模組的另一應用的示意圖； ΦThe backlight module disclosed in the present invention uses a light guide to shield the city light. In this way, the surface of the liquid crystal display can be greatly reduced in the extremely small light-mixing distance, and the larger the wire distance of the _ pre-reading machine f can be used to minimize the thickness of the liquid crystal display. In phase, the optical distance _, reducing the number of light, can also achieve the effect of homogenizing planar light used in the prior art, thereby reducing cost and energy saving. - Although the preferred embodiment of the present invention is disclosed above, it is not intended to limit the use of any of the novels of the present invention, and it is possible to make changes and refinements in the spirit and scope of the present invention. Therefore, the scope of patent protection of the present invention is subject to the definition of the patent application of this specification. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view showing a first embodiment of a backlight module of the present invention; FIG. 2 is a schematic view showing a second embodiment of a backlight module of the present invention; A schematic diagram of a third embodiment of the backlight module of the invention; FIG. 4A is a schematic diagram of a conventional backlight module; FIG. 4B is a schematic diagram of another conventional backlight module; FIG. 4C is a diagram according to the present invention Schematic diagram of the application of the backlight module; Figure 5 is a nine-point measurement diagram for defining the uniformity of luminous flux of the backlight module; Figure 6A shows the backlight module shown in Figure 4A mixed in two centimeters ASAP simulation results of light height 15 200947055 degrees; Figure 6B shows ASAP simulation results of the backlight module shown in Figure 4B at a height of two centimeters; Figure 6C shows the results of "4C" ASAP simulation result of the backlight module at a two-cm mixed light height; FIG. 7A is a schematic diagram of another conventional backlight module; FIG. 7B is a schematic diagram of another application of the backlight module according to the present invention;
第8A圖係顯示「第7A圖」所示之背光模組在兩公分混光高 度的ASAP模擬結果；以及 第8B圖係顯示「第7B圖」所示之背光模組在兩公分混光高 度的ASAP模擬結果。 【主要元件符號說明】 ιυ......................... 光模組 100.......................底座 110.......................底板 120.......................側壁 130.......................角度 200 .......................光源 201 ....................... 陰極管 202 .......................發光二極體 300 .......................導光遮罩 301 .......................内侧面 301a.....................平行面 16 200947055 301b.....................侧面 302....................... 外侧面 310.......................光擴散部 400 .......................擴散板 401 ....................... 外侧面 402 ....................... 内侧面 403 .......................混光區域 500.......................反射層 ❹ 17Figure 8A shows the ASAP simulation results of the backlight module shown in Figure 7A at a height of two centimeters; and Figure 8B shows the backlight module shown in Figure 7B at a height of two centimeters. ASAP simulation results. [Main component symbol description] ιυ........................ Optical module 100.............. .........base 110.......................floor 120............. ......... sidewall 130.......................angle 200 .............. .........light source 201 ....................... cathode tube 202 ............. ..........Lighting diode 300 .......................Light guiding mask 301 ....... ................Inside 301a.....................Parallel surface 16 200947055 301b..... ................Side 302....................... Outer side 310... .................Light diffusing section 400 ....................... diffusing plate 401 ... .................... Outer side 402 ....................... Inside side 403 . ......................The light mixing area 500.......................Reflection Layer ❹ 17