200815862 九、發明說明： 【發明所屬之技術領域】 本發明為有關於-種具表面微結構之擴散板，特別是指利用 基板及微結構搭崎賴計__反料，可_高透光 高輝度及光線均勻化之優點。 … 【先前技術】 按，-般直下式背光模组在不加光學膜片時，都無法達到輝 鲁度均勻的均勻背光要求，且當我們眼睛直視背光模組不同位置 時，將發現背細組轉度分布㈣性極差，可⑽解到這是因 為在燈官社方絲能直接進人㈣，而距_管鱗處因為光 •線無法有效地擴散到燈管旁邊暗帶區且光線無法有效聚光進入眼 睛視網膜’而這種輝度極不均勻的背光現象在顯示器通常稱為 ，MUM祕’所Μ下式背細_加上㈣板（随财200815862 IX. Description of the Invention: [Technical Field] The present invention relates to a diffusion plate having a surface microstructure, in particular, a substrate and a microstructure are used to make a high-transmission High brightness and uniformity of light. ... [Prior Art] Press, the direct-lit backlight module can not achieve the uniform backlighting uniformity of the flurity without adding the optical film, and when we look directly at the different positions of the backlight module, we will find the back The group rotation degree distribution (4) is extremely poor, but (10) can be solved because the lamp can directly enter the person (4), and the distance from the tube scale cannot be effectively diffused to the dark zone next to the lamp tube. The light can't effectively collect light into the retina of the eye' and this kind of brightness is extremely uneven. The backlight phenomenon is usually called in the display, and the MUM secret's Μ 式 _ _ _ _ _ _ _ _ _ _ _
Plate)與擴散膜片（Diffuser Film)來改善不均勻光源或燈管所造 成的MURA缺陷。 • . 然，目箣直下型背光模組使用到的擴散板係由透明光學高分 子材貝衣成’且於材貝内添加擴散粒子，講究者，係更進一步在 其擴散板出光或入光表面上製造半球面（或稱為半枉狀 ：(lenticular))的折射結構，如此一來，均勻擴散效果雖然有所提 -升，但是半球柱狀之微結構透鏡普遍存在透鏡像差 (Aberration)，所以光線擴散角度很大，由於光線擴散的角度太 大，而人的眼睛在接收光源之輝度(Brightness)聘因人眼的視角 200815862 (Field of View)有限，因此使人眼最後所感受的液晶 敕 體輝度下降衫，這都是因為大部分f光·出的光線無法真正 ^ 進入到人眼睛視網膜所造成的。 、 而在燈官數目減少而燈管之間的距離越增越大時(例如32吋 LCD TV背光模組原採用16支冷陰極燈管，現已縮減為a支），若 繼續使用傳統只添加擴散粒子或是半球面折繼構設計的擴散板 已經操法達成無MURA缺陷的嚴格要求，而必須要靠增加背光模組 馨的厚度來增加擴散度並降低MURA缺陷，但這是跟目前顯示器越來 越輕薄的要求有所違背的，所以未來若繼續採傳統擴散板的設計 •方案，將會制當要求燈管數目減量或背光模_薄化的問題。 所以未來擴散板的設計必須要有新的光學設計考量，就是必須能 有效將背光板的光有導入眼睛中而且魏達到一定的輝度與均句 度表現。 因此’如何開發-種得以解決上述習知之技術各種缺點之擴 ♦散板’藉以發展出高透光率、高輝度及光線均勻化的實用性發明， 實為目前虽欲解決的課題。 【發明内容】 因此，本發明之主要目的即在基板出光及入光至少一表面上 •提供-種運用菲>圼耳鏡片（Fresnei Lens)設計原理及司乃耳定律 :(Cell’s Law)所製成的微結構，以收斂半視角及提升〇度視角強 度。另外，基板及微結構可收斂半視角及提升〇度視角強度，但 為保證透過基板後背光模組的均勻性，需搭配特殊設計的圓孤形 200815862 反射罩’並藉由反射罩將燈源發出的部分光線反射至基板，使本 發明可將半視纽細:1Q翻，在G度視触度_提升題 左右。 為達上揭目的以及其他目的，本發明提供—種直下式背光模 組結構’包含有： 數燈源，燈源與另-燈源之間具有一定的間距； 一反射罩，係為連續並排的祕形，前述之燈源係容置於反 射罩内； 、 -基板’設社叙燈社方，伽巧分子透储質 以及 ' -微結構，係形成於前述之基板的出光及人光至少一表至 上，包括複數組的圖案。 …藉由上職術手段，本發明可以改進習知缺失轉有高透光 率、局輝度及光線均勻化之優點。 【實施方式】 有關於本發8綺細之技術、手段及魏成魏，_數較 佳實施例並配合圖式詳細酬如後，相信當可*之得深入而呈體 的瞭解。 〃 、明配口㈣第-圖及第二圖所示，本發明之第—實施例之直 下式背光模組結構，包含有. 數k源1机源丨係可為一冷陰極螢光燈管⑽L)或為孤 發光二極辦列其中之―，且燈源1與另-燈源丨之間具有一定 200815862 的間距PL。 一反射罩2 ’係為連續並排的圓弧形，其半徑R定義在前述之 \間距PL的〇· 5至〇· 75倍;而前述之燈源1係容置於反射罩2内， 、该反射罩2材質係選自於由聚曱基丙烯酸甲酯（p〇iy (Methyl methacrylate) ’ PMMA)、聚碳酸酯樹脂（p〇lycarb〇nate，pc)、 甲基丙稀酸曱醋聚苯乙烯（(Methyl methacrylate ) styrene，MS )、 聚苯乙稀（Polystyrene，PS)、紹(A1)、銀(Ag)、鎳(Ni)、銅（Cu) 鲁子錫（Su)組成的材料群組中之至少一種材質；又反射罩2係用以 反射前述之燈源1所發出的部分光線，並藉由反射罩2可使光線 更為集中。 一基板3，設於上述之燈源丨上方，係以高分子透光材質製 成，該高分子透光材質係選自於由聚甲基丙烯酸甲g旨（p〇ly( Methyl methacrylate)，PMMA)、聚碳酸酯樹脂（p〇lycarb〇nate，pc)、 甲基丙細酉夂甲酉曰♦本乙細（（Methyl methacrylate) Styrene，MS ) 馨及♦本乙細（P〇iy&yrene ’ ps )組成的材料群組中之至少一種材 料；另基板3内部係摻雜有紫外線吸收劑31，以阻絕紫外線直接 照射’避免擴散板產生黃化、裂解等現象發生；且内部掺雜有數 擴散粒子32，該擴散粒子32係選自於由聚碳酸酯樹脂 (Polycarbonate，PC )、聚甲基丙烯酸曱酯（p〇ly ( Methyl _ methacrylate)’PMMA)、曱基丙烯酸甲酯聚苯乙烯（（Methyl methacrylate) Styrene，MS)、聚笨乙烯（PolyStyrene，ps)、氧 200815862 ，夕（Silica)、石夕（Silicon)、聚氰胺⑽amin)、碳酸詞、鐵氟 旎、一氧化鈦(Τί02)及二氧化石夕(Si〇2)組成的材料群組中之至少一 ‘種材料，藉此使燈源1所發出的光線經過擴散粒子32時，造成光 i 學擴散的效果。以及 一微結構4，係形成於前述之基板3的出光及入光至少一表面 上，包括複數組非常微細的圖案(pattem)41，該圖案41係具有複 數個不同寬度P、不同角度Θ、不同對應深度H的曲折部如，該 ►曲折部411的寬度p係界於〇· 〇5麵至〇· 5腿之間，另曲折部‘η 之角度Θ均不相同，其曲折部411角度Θ設計的原理係與菲淫耳 鏡片（Fresnel Lens)設計原理相同，而設計曲折部411所需的表 數取決於上述之燈源1的數目N、燈源丨與另一燈源丨的間距pL、 燈源1與基板.3的第一距離z卜及燈源丨與反射罩2的第二距離 Z2’以間距PL為-週期，第一距離Z1加上第二距離^的值為透 鏡的後焦距，而前焦距則設為無窮遠處，並利用司乃耳定律 I (Snell’s Law)則可以訂出每一個曲折部411肖度㈣變化值，換· 言之，若背光模組共使用N個燈源i，則微結構4共有N組週期性 的圖案41，且每一週期内的曲折部411角度0變化率均相同。參 、第二圖，以燈源1正上方為中心值開始，曲折部411的角度Θ變 -化從〇到70，且曲折部411的對應深度Η變化為〇到一倍的曲 -折部411寬度Ρ。 請參閱第五圖，圖示為一曲線圖，說明習知技術(Α曲線)與本 9 200815862 發明中第一實施例(B曲線)設計押出的哀下式背光模組結構。將習 知技術的直下式背光模組與本發明第一實施例之直下式背光模組 •結構以輝度測量儀器（例如：型號Topcon BM7-fast)來測量模組的 :最終輝度與均勻度，證實本發明可將半視角收斂在±10度内，在〇 度視角強度明顯提升125%左右。 請配合參閱第三圖及第四圖所示，本發明之第二實施例之直 下式背光模組結構與第一實施例原理上基本相同，不同點在於第 >二實施例之微結構5、6係形成於基板3的出光及入光表面上，由 形成於基板3單面的微結構4、變更為形成於基板3雙面的微結構 5、6;其中，曲折部51丨、61 i的寬度ρι、p2係界於〇· 〇5咖至〇· 5咖 之間％亥見度P1可以與寬度P2相同也可以不相等，係以避免產 生干涉條紋為原則，另曲折部5n、611的角度0卜變化從〇 到40°，且曲折部5Π、611的對應深度HI、H2變化為〇到〇· 5 倍的寬度Π與0到0.5倍的寬度P2。 藉由上述技術手段，本發明之第二實施例具有數項優點：α) 其，利用第一實施例雙面微結構5、6的設計加以控制光的方向 性’比第一實施例單面微結構4控制光方向的空間來的大。（2)其 二，在製程上，第二實施例的雙面微結構5、6可以分擔第一實施 例單面微結構4所造成過大的角度（導致深度過深，會影響脫模 性），目此第二實施例雙面微結構5、6的設計結構深度將可以減 少約一半，仍保持光學特性相同。 200815862 另外特別-提的是，第-實施例與第二實施例，基板3及形 成於基板3的出光及人絲面上的微結構4、5、6可採用押出、 •共押出及射出製程，板厚在〇. 08至3. 〇_，押出的板材可為單一 ‘層（押出）或為二明治結構(共押出），若為三明治結構則可分為核 心層及附屬（Sub)層，擴散板總厚度在〇. Q8至3. Qmm，_層厚度 在 50〜200//m。 【圖式簡單說明】 ⑩第-圖是-側視圖，說明本發明之直下式背光模組結構的第一實 施例内部結構； 第一圖是一局部放大圖，說明本發明之第一實施例基板及形成於 基板表面上的微結構； 第三圖是—側視圖，說明本發明之直下式背光模組的第二實施例 内部結構； 第四圖疋一局部放大圖，說明本發明之第二實施例基板及形成於 •基板表面上的微結構；以及 第五圖疋一曲線圖，說明本發明之直下式背光模組及習知技術之 直下式背光模組的水平視角強度。 【主要元件符號說明】 ：1................燈源 :2...............反射罩 •............板 ................紫外線吸收劑 31 200815862 324· 41., 41L 5… 51·. 511_ 6… 61·· 611. R… PL·· Ρ... PI • Ρ2 θ ΘΙ Θ2 Η·· Η1· Η2 擴散粒子 微結構 圖案 曲折部 微結構 圖案 曲折部 微結構 圖案 曲折部 半徑 間距 寬度 寬度 寬度 角度 角度 角度 對應深度 對應深度 對應深度 12 200815862 zi...............第一距離 Z2...............第二距離 A.....……··… A曲線Plate) and Diffuser Film to improve MURA defects caused by uneven light sources or tubes. • However, the diffuser plate used in the direct-type backlight module is made of a transparent optical polymer material, and the diffusion particles are added to the material, and the speaker further emits light or light into the diffuser. The surface is made of a hemispherical surface (or lenticular), so that the uniform diffusion effect is improved, but the hemispherical columnar microstructure lens generally has lens aberration (Aberration). ), so the light diffusion angle is very large, because the angle of light diffusion is too large, and the brightness of the human eye in the receiving light source (Brightness) is limited by the perspective of the human eye 200815862 (Field of View), so the final feeling of the human eye The liquid crystal body brightness declines the shirt, which is because most of the light from the light can not really enter the retina of the human eye. When the number of lamp officers decreases and the distance between the lamps increases, (for example, the 32-inch LCD TV backlight module originally used 16 cold-cathode lamps, which has been reduced to a), if you continue to use the traditional only The addition of diffusing particles or a hemispherical folded-designed diffuser has been implemented to meet the stringent requirements of MURA-free defects, but must increase the thickness of the backlight module to increase the diffusion and reduce the MURA defect, but this is The increasingly thin and light requirements of the display are inconsistent, so if you continue to adopt the design and scheme of the traditional diffuser in the future, it will be required to reduce the number of lamps or the thinning of the backlight. Therefore, the design of the diffuser in the future must have new optical design considerations, that is, it must be able to effectively introduce the light of the backlight into the eye and achieve a certain degree of brightness and uniformity. Therefore, "how to develop a practical invention that solves the various shortcomings of the above-mentioned conventional techniques" has been developed to develop a high transmittance, high luminance, and uniform light, which is a problem to be solved. SUMMARY OF THE INVENTION Accordingly, the main object of the present invention is to provide a design principle of Fresnei Lens and a law of the company (Cell's Law) on at least one surface of the substrate for light emission and light entrance. The resulting microstructure is designed to converge the half angle of view and enhance the intensity of the viewing angle. In addition, the substrate and the microstructure can converge the half angle of view and enhance the intensity of the viewing angle. However, in order to ensure the uniformity of the backlight module after passing through the substrate, a specially designed circular orphan 200815862 reflector is required and the light source is used by the reflector. Part of the emitted light is reflected to the substrate, so that the present invention can turn the half-view key: 1Q, and the G-degree touch-up question is raised. In order to achieve the above and other objects, the present invention provides a direct-lit backlight module structure that includes: a plurality of light sources, a certain distance between the light source and the other light source; and a reflective cover that is continuously side by side. The secret shape, the aforementioned light source system is placed in the reflector; - the substrate is set up by the Society of Lights, the gamma molecule is permeable to the reservoir and the -microstructure is formed on the substrate and the light is at least A table up, including a pattern of complex arrays. ... By means of the upper vocational means, the present invention can improve the advantages of conventional light loss, high light transmittance, local brightness and light uniformity. [Embodiment] With regard to the techniques and means of this issue, and Wei Chengwei, after comparing the better examples with the detailed drawings, I believe that it can be understood in depth.直 明 明 明 ( 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四 四The tube (10) L) or the solitary light-emitting diodes are listed therein, and the light source 1 and the other light source have a certain distance PL of 200815862. A reflector 2' is a continuous circular arc shape, and the radius R is defined by 〇·5 to 75·75 times of the aforementioned distance PL; and the aforementioned light source 1 is housed in the reflector 2, The material of the reflector 2 is selected from the group consisting of polymethyl methacrylate (PMMA), polycarbonate resin (p〇lycarb〇nate, pc), methacrylic acid vinegar Styrene (Methyl methacrylate) styrene, MS), polystyrene (PS), Shao (A1), silver (Ag), nickel (Ni), copper (Cu) Luzi tin (Su) material At least one material in the group; the reflector 2 is used to reflect part of the light emitted by the light source 1 and the light is concentrated by the reflector 2. A substrate 3 is disposed above the light source rafter and is made of a polymer light-transmitting material selected from the group consisting of polyethyl methacrylate (p〇ly (Methyl methacrylate), PMMA), polycarbonate resin (p〇lycarb〇nate, pc), methyl methacrylate (Methyl methacrylate) Styrene, MS) 馨和♦本本细(P〇iy& Yrene ' ps ) at least one of the materials in the group; the other substrate 3 is doped with an ultraviolet absorber 31 to prevent direct ultraviolet radiation 'to avoid yellowing, cracking, etc. of the diffusion plate; and internal doping There are a plurality of diffusion particles 32 selected from polycarbonate resin (PC), poly(methyl methacrylate) (PMMA), methyl methacrylate polyphenylene. Ethylene (Methyl methacrylate Styrene, MS), Poly Styrene (PS), Oxygen 200815862, Silica, Silicon, melamine (10) amin), Carbonic acid, Teflon, Titanium (Τί02) and dioxide dioxide (Si〇2) Feeding at least a group of 'materials, whereby the light emitted from the light source 1 passes through the diffusion particles 32, resulting in the effect of the light diffusing learning i. And a microstructure 4 formed on at least one surface of the light-emitting and incident light of the substrate 3, comprising a complex array of very fine patterns 41 having a plurality of different widths P, different angles, For the zigzag portion of the corresponding depth H, for example, the width p of the ►bend portion 411 is between the 〇·〇5 faces and the 〇·5 legs, and the angle Θ of the meandering portion 'n is different, and the meandering portion 411 is angled. The principle of Θ design is the same as that of Fresnel Lens, and the number of tables required to design the meandering portion 411 depends on the number N of the above-mentioned light source 1 and the distance between the light source 丨 and another light source 丨. pL, the first distance z of the light source 1 and the substrate .3 and the second distance Z2' of the light source 丨 and the reflector 2 are at a pitch PL-period, and the first distance Z1 plus the second distance ^ is a lens The back focal length, while the front focal length is set to infinity, and using Snell's Law I can set the change value of each of the zigzag parts 411, in other words, if the backlight module is Using N lamp sources i, the microstructure 4 has a total of N sets of periodic patterns 41, and each cycle Same off rate portion 411 changes an angle of 0. Referring to the second figure, starting from the center of the light source 1 as a center value, the angle of the meandering portion 411 is changed from 〇 to 70, and the corresponding depth Η of the meandering portion 411 is changed to a double-folded portion. 411 width Ρ. Please refer to the fifth figure, which is a graph illustrating the structure of the slap-down type backlight module which is designed by the prior art (Α curve) and the first embodiment (B curve) of the invention of 2008. The direct-type backlight module of the prior art and the direct-type backlight module of the first embodiment of the present invention are configured to measure the final brightness and uniformity of the module by a luminance measuring instrument (for example, Model Topcon BM7-fast). It is confirmed that the present invention can converge the half angle of view within ±10 degrees, and the intensity of the viewing angle is significantly improved by about 125%. Referring to the third and fourth figures, the structure of the direct type backlight module of the second embodiment of the present invention is basically the same as that of the first embodiment, and the difference lies in the microstructure of the second embodiment. 6 is formed on the light-emitting surface and the light-incident surface of the substrate 3, and is changed into the microstructures 5 and 6 formed on both sides of the substrate 3 by the microstructures 4 formed on one surface of the substrate 3; wherein the bent portions 51丨, 61 The width of i is ρι, p2 is bounded by 〇· 〇5 coffee to 〇·5%% of the visibility. P1 can be the same as or different from the width P2, in order to avoid the generation of interference fringes, and the zigzag 5n, The angle 0 of 611 varies from 〇 to 40°, and the corresponding depths HI, H2 of the meandering portions 5Π, 611 are changed to a width 〇 of 〇·5 times and a width P2 of 0 to 0.5 times. By the above technical means, the second embodiment of the present invention has several advantages: a) which uses the design of the double-sided microstructures 5, 6 of the first embodiment to control the directivity of light 'one side than the first embodiment' The microstructure 4 controls the space in the light direction to be large. (2) Second, in the process, the double-sided microstructures 5, 6 of the second embodiment can share the excessive angle caused by the single-sided microstructure 4 of the first embodiment (the depth is too deep, which will affect the mold release property). Therefore, the design structure depth of the double-sided microstructures 5, 6 of the second embodiment can be reduced by about half, while still maintaining the same optical characteristics. In addition, in the first embodiment and the second embodiment, the substrate 3 and the microstructures 4, 5, and 6 formed on the substrate 3 and the human hair surface can be extruded, co-extruded, and shot. , plate thickness in 〇. 08 to 3. 〇 _, the extruded sheet can be a single 'layer (exit) or two Meiji structure (co-extruded), if it is a sandwich structure can be divided into the core layer and subsidiary (Sub) layer The total thickness of the diffuser plate is 〇. Q8 to 3. Qmm, _ layer thickness is 50~200//m. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 10 is a side view showing the internal structure of a first embodiment of a direct type backlight module structure of the present invention; FIG. 1 is a partially enlarged view showing a first embodiment of the present invention; The substrate and the microstructure formed on the surface of the substrate; the third drawing is a side view illustrating the internal structure of the second embodiment of the direct type backlight module of the present invention; and the fourth drawing is a partially enlarged view showing the first embodiment of the present invention. The second embodiment substrate and the microstructure formed on the surface of the substrate; and the fifth graph and the first embodiment illustrate the horizontal viewing angle intensity of the direct type backlight module of the present invention and the direct type backlight module of the prior art. [Main component symbol description] : 1..............Light source: 2............... Reflective cover•... ........板................UV absorber 31 200815862 324· 41., 41L 5... 51·. 511_ 6... 61·· 611. R ... PL·· Ρ... PI • Ρ2 θ ΘΙ Θ2 Η·· Η1· Η2 Diffusion particle microstructure pattern zigzag microstructure pattern zigzag microstructure pattern zigzag radius pitch width width width angle angle angle corresponding depth corresponding depth Depth 12 200815862 zi...............first distance Z2...............second distance A...........· ·... A curve
B B曲線B B curve