1338156 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（LCD， 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（Bottom 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 列的三角形之棱鏡柱(Prism rod)141及基材(SubstrateM42 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的棱線高度不變，走向 為直線，棱線兩側的斜面相對稱。 清參閱圖3、4所不。聚光片14之光學路控模式有三種： 1·全反射回收（TRI Recycle): 光線143由稜鏡柱141内約在垂直稜鏡柱141底面之虛擬 垂直轴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): 5 1338156 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，由棱鏡柱141的視角8〇.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（卩1^測3|16的），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 避免折射光線時產生干涉條紋，及防止刮傷，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，包含一基材，該基材之一側包含一 個具有凹或凸粗縫結構之光擴散層，其中該光擴散層具有 5%〜90%之擴散度；第M277950號揭示的聚光片，包括一基體’ 該基體之下表面為入光面，用以接收光束，該基體之上表面為 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 '-.ί 6 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；職基於脑辭_層鄉成—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片，大都使製作完成的聚光 片進-步於其底部再加工製作粗糙面層，較為f工時^且聚光 片具有複數平行的稜鏡柱的-面較為光滑，若有缺陷時，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 長條狀棱鏡柱及複數長條狀粗糙的擴散面；至少有兩相鄰的 該稜鏡柱之間具有該長條狀粗糙的擴散面，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 可增加擴散聚光片的生產良率；又基材、複數縱向排列的長 條狀棱鏡枉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及複數長條狀粗糙的擴散面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及第二側面323 ; 稜線321置於稜鏡柱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、二側面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。 本發明的擴散聚光片30’藉由介於兩稜鏡柱32之間的擴 散面33擴散出之光線33丨混合稜鏡柱32射出的光線犯4，如 囷6所示，可有效減少光之色散現象及霧化稜鏡柱犯的條 紋，並減少疊紋發生的機會；且由兩相鄰的稜鏡柱32之間具 有長條狀粗糙的擴散面33,擴散聚光片30整體外表並非呈現 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Y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，利用介於兩稜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 及長條狀粗糙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。 1338156 【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。1338156 IX. Description of the Invention: [Technical Field] The present invention relates to a concentrating sheet, and more particularly to a backlight system for a liquid crystal display (LCD) or other desired diffusing condensing sheet. [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 Bottom 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 prism prisms 141 and a substrate (substrate M42) arranged in parallel in the longitudinal direction. The prism column 141 is bonded to one side of the substrate 142. The height of each prism 141 The width is the same, and the height of the ridge line of the prism column 141 is constant, the direction is a straight line, and the slopes on both sides of the ridge line are symmetrical. See Figures 3 and 4 for clarity. There are three optical path modes of the concentrating sheet 14: TRI Recycle: When the light ray 143 is incident within the column 141 within about ±4° of the virtual vertical axis 140 of the bottom surface of the vertical mast 141, the total reflection of the beveled column 141 is The effect, after two total reflections, is recovered to the direction of the back light source, and continues to spread and utilize; 2. 2nd Reflection Recycle: 5 1338156 Light 144 is refracted by two sets of masts 141 and then recycled to The direction of the light source is continued, and the diffusion and propagation are continued; and 3. Directed Reflective: The light 145 is refracted by the inclined surface of the mast 141, and the optical path mode has the function of concentrating light; as shown in FIG. The viewing angle of the column 141 8〇 The refracted light in the range is useful. The chromaticity X value and the chromaticity γ value of the conventional condensing sheet 14 correspond to the change value of the viewing angle respectively, as shown by the imaginary line curve and the solid line curve in FIG. 4, respectively. The numerical value of the upper and lower variation of the dotted curve and the solid curve shows that the light dispersion phenomenon of the conventional condensing sheet 14 is more obvious, and the phenomenon of crease is likely to occur. There are a plurality of condensing sheets having a light diffusion layer, For example, the concentrating sheet disclosed in U.S. Patent No. 5,844,720 has a plurality of triangular prisms arranged longitudinally in parallel and having a rough surface on the other side to avoid interference when refracting light. Striping, and preventing scratches, and making the brightness of the condensing sheet uniform, which is advantageous for use in a liquid crystal display; the concentrating sheet disclosed in Taiwan Patent No. M293442, comprising a substrate, one side of the substrate comprising a a light diffusing layer having a concave or convex thick slit structure, wherein the light diffusing layer has a diffusivity of 5% to 90%; and the light collecting sheet disclosed in No. M277950 includes a substrate 'the lower surface of the substrate is a light incident surface, use Receiving a light beam, the upper surface of the substrate is a light-emitting surface disposed opposite to the light-incident surface; the substrate has scattering particles therein; and the diffusion concentrating sheet disclosed in Taiwan Patent Publication No. 415355, the diffusion concentrating sheet'-. ί 6 mainly comprises - a substrate and a fine semi-spherical layer. The fine semi-spherical layer is formed without unceasing; the job is based on the brain---------------------------- The bottom surface of the diffusing concentrating sheet has a smooth surface. The concentrating sheet with the light diffusing layer described above mostly causes the finished concentrating sheet to be further processed at the bottom to be rough. The surface layer is more than a working time ^ and the concentrating sheet has a plurality of parallel columns - the surface is relatively smooth, and if there is a defect, it is easier to be found, and is considered as a defective product. SUMMARY OF THE INVENTION The present invention has been made in order to make a condensing sheet having a light diffusing structure easier to fabricate. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a diffusing condensing sheet which facilitates the production of 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 yield. The diffusing concentrating sheet of the invention is used for reducing the light dispersion phenomenon of the mast and the probability of occurrence of the moiré, and helping to improve the production yield, including a substrate for the light to pass through; One surface of the material comprises a plurality of longitudinally arranged long prism prism columns and a plurality of elongated rough diffusion surfaces; at least two adjacent ones of the masts have the elongated rough diffusion surface, which can effectively reduce The dispersion of light and the streaks of the atomized column, and reduce the chance of occurrence of moiré, and can increase the production yield of the diffused concentrating sheet; and the substrate, the plurality of longitudinally arranged long prisms and long strips The rough diffusing surface can be an integral part, so it is easier to make. For other purposes and functions of the present invention, please refer to the drawings and the embodiments, which are described in detail below. [Embodiment] Please refer to Figures 5, 6, and 7. The diffusing concentrating sheet of the present invention is used to reduce the phenomenon of light dispersion and the occurrence of moiré, and to improve the yield of the production. The diffusing concentrating sheet 3 of the embodiment of the present invention comprises: a substrate 31 through which light can pass therethrough. A surface of the substrate 31 includes a plurality of longitudinally arranged elongated columns 32 and a plurality of elongated rough diffusion surfaces 33; at least two adjacent columns 32 have elongated rough diffusion surfaces therebetween 33; each of the masts 32 has a ridge line 321 and a first side surface 322 and a second side surface 323; the ridge line 321 is placed at the highest position of the mast 32; the first and second side surfaces 322, 323 are respectively two of the ridge line 321 The side extends to the surface of the diffusion surface 33 or the substrate 31; however, 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. The diffusing condensing sheet 30' of the present invention illuminates the light ray 33 emitted by the mixing column 32 by the diffusing surface 33 between the two cymbals 32, as shown by 囷6, which can effectively reduce the light. The dispersion phenomenon and the streaks of the atomized column, and reduce the chance of occurrence of the moiré; and the diffusing surface 33 having a long stripe between the two adjacent masts 32, the overall appearance of the diffusing concentrating sheet 30 It does not present a completely smooth surface, and even if the first and second sides 322, 323 have a few defects, they are not easily found, and are considered to be defective, so that the production yield of the diffusion concentrating sheet 30 can be increased. The chromaticity X value and the chromaticity Y 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 by the diffusing surface between the two masts is used to mix the light emitted by the mast. , can effectively reduce the dispersion of light and the streaks of the atomized column, and reduce the chance of occurrence of moiré, and can increase the production yield of the diffusion concentrating sheet; and the substrate, the plurality of longitudinally arranged long strips The column and the strip-shaped rough diffusion surface can be integrally formed, and thus are easier to manufacture. The above description is only for the embodiments of the present invention, and any modifications and variations made by those skilled in the art using the present invention are the scope of the invention claimed, and are not limited to the embodiments disclosed. 1338156 [Simplified Schematic] 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. 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下擴散片 140垂直轴 142基材 15上擴散片 30擴散聚光片 32稜鏡柱 322第一側面 33粗链面 14聚光片 141棱鏡柱 143、144、145 光線 16反射片 31基材 321稜線 323第二側面 324、331 光線13 lower diffusion sheet 140 vertical axis 142 substrate 15 upper diffusion sheet 30 diffusion concentrating sheet 32 collateral 322 first side 33 thick chain surface 14 concentrating sheet 141 prism column 143, 144, 145 light 16 reflecting sheet 31 substrate 321 ridgeline 323 second side 324, 331 light