200813488 九、發明說明： 【發明所屬之技術領域】 本發明係有關聚光片’尤其是有關用以液晶顯示器（Lcj), Liquid Crystal Display)之背光系統或其它需要的擴散聚 光片者。 【先前技術】 請參閱圖1所示。一般液晶顯示器之背光系統，包括冷陰 極燈管（CCFL)ll、導光板（LGP)12、下擴散片（Bott〇m diffuser)13、聚光片（Prism sheet)14、上擴散片（τ〇ρ diffuser)15 及反射板(Reflector)16 所組成。 請參閱圖2所示。習知聚光片14係由複數個縱向平行排 列的三角形之稜鏡柱(Prism rod)141及基材（Substrate)U2 所組成。棱鏡柱141結合於基材142的一侧邊。每一菱鏡柱 141的高度、寬度相同，且棱鏡柱141的稜線高度不變，走向 為直線，棱線兩侧的斜面相對稱。 請參閱圖3、4所示。聚光片14之光學路徑模式有三種： 1. 全反射回收（TRI Recycle): 光線143由棱鏡柱141内約在垂直棱鏡柱141底面之虛擬 垂直軸140的± 4内射入時，受稜鏡斜面柱141的全反射現 象之影響，經兩次全反射後，回收至背後光源方向，繼續擴散 傳播利用； 2. 二次折射回收（2nd Reflection Recycle): 200813488 光線144經由兩組稜鏡柱141的折射後，再回收至背後 光源方向，繼續擴散傳播利用；及 3·直接折射(Directed Reflective): 光線145經由稜鏡柱141的斜面折射出，此光路模式有集 中光線之作用；如圖3中所示，由稜鏡柱141的視角80。範 圍内折射出的光線才有利用價值。 習知聚光片14的色度X值及色度γ值分別對應於視角的 變化值，分別如圖4中的虛線曲線及實線曲線所示者，由虛線 曲線及實線曲線上、下變化幅度較大的數值，顯示習知聚光片 14的光色散現象較明顯，且容易發生疊紋的現象。 有多種具有光擴散層的聚光片，例如美國專利第 5,844,720號揭示的聚光片（!¥1測油沈1：)，其一面具有複數 縱向接近平行排列的三角形稜鏡柱，其另一面具有粗糙面，可 避免折射絲時產生干涉倾，及防止嶋，並使折射出聚光 片的亮度均一，有利於供液晶顯示器之使用；台灣專利第 M293442號揭示的聚光片，包含—紐，該基材之—側包含一 個具有凹或凸粗Μ結構之光擴散層，其巾該光擴散層具有 5/0 9(U之擴政度，第Μ277950號揭示的聚光片，包括一基體， 該基趙之下表面為人絲，⑽減絲，該細之上表面為 與該入光面相對設置之出光面；該基體内部具有散射粒子；及 台灣專利公告第415355號所揭的擴散聚光片，該擴散聚光片 6 200813488 主要包含-基片及-細微半圓球層。該細微半圓球層灌模形成 而未固化時;將該基片黏貼於該細微半圓球層以形成一擴散聚 光片。而該擴散聚光片之上表面具有數個細微半圓球，而該擴 散聚光片之底表面則具有一光滑面。 、 上述各種具有光擴散層的聚光#，续使製作完成的聚光 片進步於其底部再加工製作粗輪面層，較為費王時。且聚光 片具有複數平行的稜餘的-峨為紐，若有雜時較容 # 易被發現，而被認定為瑕疵品。 【發明内容】 為了使具有光擴散結構的聚光片較容易被製作，而提出 本發明。 本發明的主要目的，在提供一種擴散聚光片，容易製作 聚光片的擴散結構，節省製造成本。 本發明的另一目的，在提供一種擴散聚光片，可有效減 • 少稜鏡柱的光色散現象及疊紋發生的機率，及有助於提升生 產良率。 本發明的擴散聚光片，係用以減少稜鏡柱的光色散現象 及疊紋發生的機率，及有助於提升生產良率者，包括一基材， 可供光線穿射通過;該基材的一表面包含有複數縱向排列的 長條狀稜鏡柱及複數長條狀粗糙的擴散面；至少有兩相鄰的 該棱鏡柱之間具有該長條狀粗糖的擴散面，可有效減少光之 色散現象及霧化稜鏡柱的條紋，並減少疊紋發生的機會，且 7 200813488 可增加擴散聚光片的生產良率；又基材、複數縱向排列的長 條狀棱鏡柱及長條狀粗糙的擴散面可為一體成型者，因此較 容易被製作。 本發明的其他目的、功效，請參閱圖式及實施例，詳細 說明如下。 【實施方式】 請參閱圖5、6、7所示。本發明擴散聚光片，係用以減 _ 少稜鏡柱的光色散現象及疊紋發生的機率，及有助於提升生 產良率者。本發明的實施例之擴散聚光片3〇，包括：一基材 31 ,可供光線穿射通過。基材31的一表面包含有複數縱向排 列的長條狀稜鏡柱32及複數長條狀粗糖的擴散面33;至少有 兩相鄰的稜鏡柱32之間具有長條狀粗糙的擴散面33;每一稜 鏡柱32分別具有棱線321及第一侧面322及第二侧面323 ; 稜線321置於棱鏡柱32的最高位置；第一、二側面322、323 分別由稜線321的兩側延伸至擴散面33或基板31的表面； # 但最外側的第一、二侧面322、323分別延伸至基板31的表 面。擴散面33散面之寬度約佔稜鏡柱底面寬度之3%至5〇%之 間。 本發明的擴散聚光30,藉由介於兩稜鏡柱％之間的擴 散面33餘出之光線331混合稜鏡柱32射出的光線324，如 圖6所示，可有效減少光之色散現象及霧化棱鏡柱犯的條 紋，並減少疊紋發生的機會；且由兩娜的稜鏡柱32之間具 有長餘粗_擴散面33,擴散聚光片3〇整體外表並非呈現 8 200813488 完全的光滑面，即使第一、二側面322、323具有少許缺陷， 亦不容易被發現，而被認為是瑕疵品，因此可增加擴散聚光 片30的生產良率。 本發明擴散聚光片的色度X值及色度γ值分別對應於視 角的變化值，分別如圖7中的虛線曲線及實線曲線所示者， 由虛線曲線及實線曲線上、下變化幅度小於圖4中所示者， 顯示本發明擴散聚光片較習知聚光片的光色散現象較不明 顯，且較不容易發生疊紋的現象。 本發明的擴散聚光片，係使兩相鄰的棱鏡柱之間具有長 條狀粗糙的擴散面，利用介於兩棱鏡柱之間的擴散面擴散出 之光線混合稜鏡柱射出的光線，可有效減少光之色散現象及 霧化稜鏡柱的條紋，並減少疊紋發生的機會，且可增加擴散 聚光片的生產良率；又基材、複數縱向排列的長條狀稜鏡柱 及長條狀粗縫的擴散面可為一體成型者，因此較容易被製作。 以上所記載，僅為利用本發明技術内容之實施例，任何熟 悉本項技藝者運用本發明所為之修飾、變化，皆屬本發明主張 之專利範圍’而不限於實施例所揭示者。 200813488 【圖式簡單說明】 圖1為已知顯示器的背光系統示意圖。 圖2為已知聚光片的示意圖。 圖3為本已知聚光片的各種光線折射模式的示意圖 圖4為習知聚光片的色度對視角的分佈圖。 圖5為本發明擴散聚光片實施例的示意圖。 圖6為本發明擴散聚光片光線擴散的示意圖。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentrating sheet, particularly to a backlight system for a liquid crystal display (Lcj), or other desired diffusion concentrator. [Prior Art] Please refer to Figure 1. A backlight system for a general liquid crystal display, including a cold cathode fluorescent lamp (CCFL) 11, a light guide plate (LGP) 12, a lower diffuser (Bott〇m diffuser) 13, a prism sheet 14, and an upper diffusion sheet (τ〇) ρ diffuser) 15 and reflector (Reflector) 16 are composed. Please refer to Figure 2. The conventional concentrating sheet 14 is composed of a plurality of longitudinally parallel triangular pillars 141 and a substrate U2. The prism column 141 is bonded to one side of the substrate 142. The height and width of each of the prism columns 141 are the same, and the height of the ridge line of the prism column 141 is constant, and the direction is a straight line, and the slopes on both sides of the ridge line are symmetrical. Please refer to Figures 3 and 4. There are three optical path modes of the concentrating sheet 14: 1. TRI Recycle: The ray 143 is incident on the prism column 141 within ±4 of the virtual vertical axis 140 of the bottom surface of the vertical prism column 141. The effect of the total reflection phenomenon of the mirror bevel column 141 is recovered to the direction of the back light source after two times of total reflection, and the diffusion propagation is continued; 2. 2nd Reflection Recycle: 200813488 Light 144 passes through two sets of columns After the refraction of 141, it is recycled to the direction of the back light source, and the diffusion propagation is continued; and 3. Directed Reflective: The light 145 is refracted through the inclined surface of the mast 141, and the optical path mode has the function of concentrating light; Shown in 3 is the viewing angle 80 of the mast 141. The light reflected in the range is of value. The chromaticity X value and the chromaticity γ value of the conventional condensing sheet 14 respectively correspond to the change value of the viewing angle, respectively, as shown by the dashed curve and the solid line curve in FIG. 4, and the upper and lower variability of the dotted line curve and the solid line curve respectively. A larger value indicates that the light dispersion phenomenon of the conventional condensing sheet 14 is more conspicuous, and the phenomenon of moiré is liable to occur. There are a plurality of concentrating sheets having a light-diffusing layer, such as a concentrating sheet disclosed in U.S. Patent No. 5,844,720, which has a plurality of longitudinally nearly parallel triangular prisms on one side and the other side. It has a rough surface, which can avoid interference tilt when refracting the wire, prevent smudging, and make the brightness of the condensed condensing sheet uniform, which is beneficial to the use of the liquid crystal display; the concentrating film disclosed in Taiwan Patent No. M293442, including The side of the substrate comprises a light diffusing layer having a concave or convex rough structure, and the light diffusing layer has a light diffusing layer of 5/0 9 (U degree of expansion, the concentrating sheet disclosed in No. 277950, including one a base body, the surface of the base is a human filament, (10) a wire is reduced, and the upper surface of the base is a light-emitting surface disposed opposite to the light-incident surface; the base has scattering particles therein; and the invention is disclosed in Taiwan Patent Publication No. 415355 a diffusing concentrating sheet, the diffusing concentrating sheet 6 200813488 mainly comprises a substrate and a fine semi-spherical layer. When the fine semi-spherical layer is formed and uncured; the substrate is adhered to the fine semi-spherical layer to form A diffusing concentrating sheet. The surface of the diffusing concentrating sheet has a plurality of fine semi-spherical spheres, and the bottom surface of the diffusing concentrating sheet has a smooth surface. The above-mentioned various concentrating lights having a light diffusing layer continue to make the finished concentrating light. The film progresses to the bottom to re-process the rough wheel surface layer, which is more expensive. And the concentrating film has a plurality of parallel ridges - 峨 is a new one, if there is a miscellaneous time, it is easy to be found, and is recognized as 瑕疵SUMMARY OF THE INVENTION The present invention has been made in order to make a concentrating sheet having a light diffusing structure easier to fabricate. The main object of the present invention is to provide a diffusing condensing sheet, which is easy to produce a diffusing structure of a condensing sheet, and saves Manufacturing Costs Another object of the present invention is to provide a diffusing concentrating sheet which can effectively reduce the light dispersion phenomenon of the mast and the probability of occurrence of moiré, and contribute to the improvement of the production yield. A concentrating sheet is used to reduce the phenomenon of light dispersion and the occurrence of moiré, and to improve the production yield, including a substrate for light to pass through; a surface of the substrate Contains plural a long strip-shaped column and a plurality of strip-shaped rough diffusion surfaces; at least two adjacent prism columns have a diffusion surface of the strip-shaped raw sugar, which can effectively reduce the dispersion of light and atomization The streaks of the mast and reduce the chance of occurrence of moiré, and 7 200813488 can increase the production yield of the diffused concentrating sheet; and the substrate, the plurality of longitudinally arranged long prism prisms and the long strip-shaped diffusing surface can be The other objects and effects of the present invention will be described in detail with reference to the drawings and the embodiments. The embodiments will be described below with reference to Figures 5, 6 and 7. The present invention The light sheet is used to reduce the light dispersion phenomenon of the mast and the probability of occurrence of the moiré, and to contribute to the improvement of the production yield. The diffusion concentrating sheet of the embodiment of the present invention includes: a base Material 31 for light to pass through. A surface of the substrate 31 includes a plurality of longitudinally arranged elongated columns 32 and a plurality of elongated strips of coarse sugar diffusing surface 33; at least two adjacent masts 32 have elongated rough diffusing surfaces therebetween 33; each of the columns 32 has a ridge 321 and a first side 322 and a second side 323; the ridge 321 is placed at the highest position of the prism column 32; the first and second sides 322, 323 are respectively flanked by the ridges 321 The surface extends to the diffusion surface 33 or the surface of the substrate 31; # But the outermost first and second sides 322, 323 extend to the surface of the substrate 31, respectively. The width of the diffusing surface 33 is about 3% to 5% of the width of the bottom surface of the mast. In the diffused condensing 30 of the present invention, the light ray 324 emitted by the mast 32 is mixed by the light ray 331 remaining between the two prisms. As shown in FIG. 6, the dispersion of light can be effectively reduced. And atomizing the prism column to make the stripe and reduce the chance of occurrence of the moiré; and the long slab_diffusion surface 33 between the two columns of the two columns, the diffused concentrating sheet 3 〇 the overall appearance is not presented 8 200813488 Complete The smooth surface, even if the first and second sides 322, 323 have a few defects, is not easily found, and is considered to be a defective product, so that the production yield of the diffusion concentrating sheet 30 can be increased. The chromaticity X value and the chromaticity γ value of the diffusing condensing sheet of the present invention respectively correspond to the change value of the viewing angle, respectively, as shown by the dashed curve and the solid curve in FIG. 7, and the dotted curve and the solid curve are up and down respectively. The variation range is smaller than that shown in FIG. 4, which shows that the diffused condensing sheet of the present invention is less noticeable than the conventional concentrating sheet, and the phenomenon of moiré is less likely to occur. The diffusing concentrating sheet of the present invention has a long and rough diffusing surface between two adjacent prism columns, and the light diffused from the diffusing surface between the two prism columns is used to mix the light emitted by the mast. It can effectively reduce the dispersion of light and the streaks of the atomized column, reduce the chance of occurrence of moiré, and increase the production yield of the diffusion concentrating sheet; and the substrate and the plurality of longitudinally arranged long columns And the diffusing surface of the long strip-shaped slit can be integrally formed, so it is easier to manufacture. The above description is only for the embodiments of the present invention, and any modifications and variations of the present invention will become apparent to those skilled in the art. 200813488 [Simple Description of the Drawings] FIG. 1 is a schematic diagram of a backlight system of a known display. 2 is a schematic view of a known concentrating sheet. Fig. 3 is a schematic view showing various light refraction patterns of the known concentrating sheet. Fig. 4 is a distribution diagram of chromaticity versus viewing angle of a conventional concentrating sheet. Figure 5 is a schematic illustration of an embodiment of a diffusing concentrating sheet of the present invention. FIG. 6 is a schematic view showing light diffusion of a diffusion concentrator according to the present invention.
圖7為本發明擴散聚光片的色度對視角的分佈圖。 【主要元件符號說明】 11冷極燈管 12導光板 13下擴散片 14聚光片 140垂直轴 141棱鏡柱 142 基材 143、144、145 光線Fig. 7 is a view showing the distribution of chromaticity versus viewing angle of the diffusing condensing sheet of the present invention. [Main component symbol description] 11 cold lamp tube 12 light guide plate 13 lower diffusion sheet 14 concentrating sheet 140 vertical axis 141 prism column 142 substrate 143, 144, 145 light
15上擴散片 30擴散聚光片 32棱鏡柱 322第一側面 33粗糙面 16反射片 31基材 321棱線 323第二側面 324、331 光線15 upper diffuser 30 diffused concentrating sheet 32 prism pillar 322 first side 33 rough surface 16 reflective sheet 31 base material 321 ridge line 323 second side 324, 331 light