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W-fc,,,_ .............Λ....1.,·. 一’一、城……‘ 【發明所屬之技術領域】 本發明是有關於一種光學板片及其應用，且特別是有關 於一種擴散光學板片及其在背光模組與液晶顯示器上之應 用0 【先前技術】 在液晶顯不1§之背光权組中’一般會在光源之上設置許 多光學膜片或光學板片，藉以改善背光模組之出光品質。在 這些光學膜片或光學板片中，通常包括一擴散板。擴散板中 散布有許多擴散微粒，其中這些擴散微粒之折射率與擴散板 本身材料之折射率不同。透過擴散板本身材料與散布其中之 擴散微粒的折射率差異，可提供射入光線光擴散功能，進而 藉以使光源所發出之光在經過擴散板後之出射光的分布較 為均勻。 傳統擴散板係一單純的平板狀結構，其表面上並未設置 有凸狀結椿，因此擴散能力不彰，而導致光學表現不佳。為 改善元件之光學表現，現行之擴散板的表面上凸設有三角形 結構。請參照第1圖，其係繪示習知一具三角形凸狀結構之 擴散板的剖面圖。一般常見的擴散板100中，主要係由基板 102與許多三角形凸狀結構104所構成，其中這些三角形凸 狀結構104通常係藉由在基板102之表面進行微結構加工處 理後而形成。此外，每一個三角形凸狀結構104之剖面形狀 通常呈等腰直角三角形，亦即頂角為直角。 5 200846712 清參照第2A圖與第2B圖’係繪示未經擴散板、經傳 統擴散板以及經習知三角形結構擴散板後之光分布曲線局 部及全面示意圖。在第2 A圖中’未加任何擴散板之情況下 所獲得之燈管照度分布為曲線110,設置傳統平板狀之擴散 板的情況下所獲得之照度分布為曲線112,而設置習知三角 形凸狀結構之擴散板的情況下所獲得之照度分布為曲線 114。從第2A圖可清楚得知，照度分布曲線11()的起伏明 顯較曲線112與曲線114大，且曲線114之高低起伏的程度 又小於曲線112;曲線11〇之最高照度與最低照度之照度差 △ 1^亦明顯大於曲線112之照度差Ah以及曲線114之照 度差△ Ls，且曲線114之照度差a b小於曲線112之照度 差Δί2;而且曲線114之照度半高寬（Fun width Half Max.; FWHM，每兩燈管間距中達最大寬度1/2的寬度範圍）π;則 明顯大於曲線110之半高寬Wl及曲線112之半高寬W2。 再從第2B圖可知，在相同光源間距下，具有較大照度半高 寬W3之曲線114的照度均勻度明顯比照度半高寬較低之曲 線110與曲線112佳，此乃因半高寬較大者有較大部分的寬 度範圍皆具有達該燈管區最大寬度1/2的光線所致。 另由圖中所示可知，雖然具三角形凸狀結構之擴散板 100可改善光源之出光分布的均勻度，但卻會在最接近燈管 (光源)的中央部會有相對的照度低點存在，而容易形成暗紋 區，亦稱為燈管暗纹現象（Lamp Mura)。通常，為了改善或 消除此一現象，就必須縮短燈管間距，而導致增加燈管數量 與成本’或者增加背光模組厚度或增加其他光學膜片，而導 200846712 致顯示器重量、體積以及成本的增加 【發明内容】 因此，本發明之目的就是在提供一種光學板片，可有效 擴展光源之照度半高寬（Full Width Half Max; fwhm卜進 而可使照度分布更為均勻。 本發明之另一目的是在提供一種背光模組，僅利用一光 學板片即可將改善光源之照度分布，因此不僅可提升背光模 組之照度’更可有效縮減背紐組之厚度，並減少光源之數 量，進而可降低背光模組之成本與重量。 本發明之又-目的是在提供一種液晶顯示器，藉由使用 可擴大光源之照度半高寬的光學板片，可提升液晶顯示p之 顯不品質’縮減液晶顯示器之厚度，減少光 低製作成本。 .根據本發明之上述目的，提出一種光學板片，至少包 括.一基板；複數個多邊形凸狀結構，設於基板之-表面上， :中基板與、些多邊形凸狀結構係由透光材料所構成; 複數個擴散微粒，散布於其士 、 狀布於基板與廷些多邊形凸狀結構中，发 中透光材料之折射係數與擴散微粒之折射係數不同。、 依照本發明—較佳實施例，上述之多邊形 構 五邊形凸狀結構。 再1糸 依照本發明另—較佳實施例，上述 一梯形凸狀結構。 ^ ϋ狀構係 «本發明之目的’提出一種背光模組 200846712 反射背板；至少一光源，設於反射背板之上；以及一光學板 片，設於光源之上。其中，光學板片至少包括：一基板；複 數個多邊形凸狀結構，設於基板之一表面上，其中基板與這 些多邊形凸狀結構係由透光材料所構成；以及複數個擴散微 粒，散布於基板與多邊形&狀結構中，其中透光材料之折射 係數與擴散微粒之折射係數不同。 ' 依照本發明一較佳實施例，上述之光源為條狀光源，例» . . W-fc,,, _ .............Λ....1.,···一一一,城...' [Technical Field of the Invention] The present invention It is related to an optical sheet and its application, and in particular to a diffusing optical sheet and its application in a backlight module and a liquid crystal display. [Prior Art] In the backlight group of liquid crystal display Generally, a plurality of optical films or optical sheets are disposed on the light source to improve the light quality of the backlight module. In these optical films or optical sheets, a diffusing plate is usually included. The diffusing plate is interspersed with a plurality of diffusing particles, wherein the refractive indices of the diffusing particles are different from the refractive index of the material of the diffusing plate itself. The difference in refractive index between the material of the diffusing plate itself and the diffusing particles dispersed therein can provide a light diffusing function of the incident light, so that the light emitted by the light source is more evenly distributed after passing through the diffusing plate. The conventional diffusing plate is a simple flat plate structure, and the surface of the diffusing plate is not provided with a convex knot, so that the diffusion ability is not good, resulting in poor optical performance. In order to improve the optical performance of the component, the current diffusion plate has a triangular structure on its surface. Referring to Fig. 1, there is shown a cross-sectional view of a conventional diffusion plate having a triangular convex structure. Generally, the diffusing plate 100 is mainly composed of a substrate 102 and a plurality of triangular convex structures 104, which are usually formed by performing microstructure processing on the surface of the substrate 102. In addition, the cross-sectional shape of each of the triangular convex structures 104 is generally an isosceles right triangle, that is, the vertex angle is a right angle. 5 200846712 Referring to Figures 2A and 2B, a partial and comprehensive schematic diagram of the light distribution curve after the diffusion plate, the conventional diffusion plate, and the conventional triangular structure diffusion plate are shown. In Fig. 2A, the lamp illuminance distribution obtained in the case where no diffusing plate is added is the curve 110, and the illuminance distribution obtained in the case where the conventional flat diffusing plate is set is the curve 112, and the conventional triangle is set. The illuminance distribution obtained in the case of a diffusing plate of a convex structure is a curve 114. It can be clearly seen from Fig. 2A that the undulation of the illuminance distribution curve 11() is significantly larger than the curve 112 and the curve 114, and the degree of the undulation of the curve 114 is smaller than the curve 112; the illuminance of the highest illuminance and the lowest illuminance of the curve 11〇 The difference Δ 1 ^ is also significantly larger than the illuminance difference Ah of the curve 112 and the illuminance difference Δ Ls of the curve 114, and the illuminance difference ab of the curve 114 is smaller than the illuminance difference Δί2 of the curve 112; and the illuminance of the curve 114 is half width (Fun width Half Max) FWHM, the width range of 1/2 of the maximum width of each of the two lamp tubes) π; is significantly larger than the half-height width W1 of the curve 110 and the half-height width W2 of the curve 112. From Fig. 2B, it can be seen that under the same light source spacing, the illuminance uniformity of the curve 114 having the large illuminance half width W3 is obviously better than the curve 110 and the curve 112 having the lower illuminance half height and width, which is due to the full width at half maximum. The larger part has a larger width range of light having a maximum width of 1/2 of the tube area. As can be seen from the figure, although the diffuser plate 100 having a triangular convex structure can improve the uniformity of the light distribution of the light source, it will have a relative low illumination point in the central portion closest to the light pipe (light source). It is easy to form a dark area, also known as Lamp Mura. In general, in order to improve or eliminate this phenomenon, it is necessary to shorten the lamp spacing, which leads to an increase in the number and cost of the lamp' or increase the thickness of the backlight module or increase other optical films, and the 200846712 results in weight, volume and cost of the display. [Invention] Therefore, the object of the present invention is to provide an optical sheet which can effectively expand the illuminance half-height of the light source (Full Width Half Max; fwhmbu, which in turn can make the illuminance distribution more uniform. Another aspect of the present invention The purpose is to provide a backlight module, which can improve the illumination distribution of the light source by using only one optical plate, thereby not only improving the illumination of the backlight module, but also effectively reducing the thickness of the back button group and reducing the number of light sources. Further, the cost and weight of the backlight module can be reduced. The present invention is also directed to providing a liquid crystal display capable of improving the display quality of the liquid crystal display p by using an optical plate which can enlarge the illumination width of the light source. Reducing the thickness of the liquid crystal display and reducing the manufacturing cost of the light. According to the above object of the present invention, an optical plate is proposed. , comprising at least one substrate; a plurality of polygonal convex structures disposed on the surface of the substrate, wherein: the middle substrate and the polygonal convex structures are composed of a light transmissive material; the plurality of diffusing particles are dispersed in the warrior, The refractive index of the light-transmitting material in the hair is different from the refractive index of the diffusing particles in the substrate and the polygonal convex structure. According to the preferred embodiment of the present invention, the above-mentioned polygonal pentagon convex structure. Further, according to another preferred embodiment of the present invention, the above-mentioned trapezoidal convex structure. ^ ϋ-shaped structure «the object of the present invention" proposes a backlight module 200846712 reflective back plate; at least one light source is disposed on the reflective back plate And an optical plate disposed on the light source, wherein the optical plate comprises at least: a substrate; a plurality of polygonal convex structures disposed on a surface of the substrate, wherein the substrate and the polygonal convex structures are Consisting of a light-transmitting material; and a plurality of diffusing particles dispersed in the substrate and the polygonal &lified structure, wherein the refractive index of the light-transmitting material and the refractive system of the diffusing particles Different. 'In accordance with a preferred embodiment of the present invention, the above-described bar-shaped light source is a light source, for example
如冷陰極螢光燈（CCFL)或發光二極體光條（LED Ught Bar) 〇 根據本發明之另一目的，提出一種液晶顯示器，至少包 括:厂液晶顯示模組；以及一背光模組，設於液晶顯示模組 之背面，其中背光模組至少包括：一反射背板；至少一光源， 設於反射背板之上；以及一光學板片，設於光源之上。其中， 光學板片至少包括：-基板；複數個多邊形凸狀結構，設於 基板之-表面上’其中基板與這些多邊形凸狀結構係由透光 材料所構m複數個擴散微粒，散布於基板與多邊形凸 狀結構中’其巾透光材料之折射係數與擴散微粒之折射係數 技：照本發明一較佳實施例，上述多邊形凸狀結構包括依 :::之第-侧面、第二侧面、第三側面以及第四侧面，其 側面及第四侧面均與基板之表面接合。此外，第二側 面，、弟三側面之交點低於第一側面與第四側面之延伸交點。 【實施方式】 8 200846712 本發明揭露一種光學板片及其應用，可大幅改善光源之 出射光的照度分布均勻度，並可提高背光模組之照度，減少 月光核組之光源的數量，而降低成本，更可縮減背光模組以 及液晶顯示器之厚度。為了使本發明之敘述更加詳盡與完 備，可參照下列描述並配合第3圖至第14圖之圖式。 请參照弟3圖，其繪示依照本發明一較佳實施例的一種 光學板片之剖面圖。光學板片200主要包括基板202、複數 個多邊形凸狀結楱204以及擴散微粒220。這些多邊形凸狀 結構204設置在基板202之表面206上，而微粒220則散布 在基板202與所有之多邊形凸狀結構204中。在一較佳實施 例中’製作光學板片200時，可直接利用微結構加工處理技 術，例如射出成型技術或滾壓成型技術，而形成具多邊形凸 狀結構204之光學板片200，此時多邊形凸狀結構204與基 板202為一體成型之結構。基板202與多邊形凸狀結構204 均係由透光材料所組成，以利光通過。基板2〇2與多邊形凸 狀結構204之材料的折射係數與擴散微粒22〇之折射係數不 同。透過基板202及多邊形凸狀結構204本身材料與散布其 中之擴散微粒之折射率之間的差異，可使光學板片2〇〇具有 光擴散功能，如此一來可使光源所發出之光在經過光學板片 200後之出射光的分布更加均勻。 在一示範貝細*例中’晴參照第4圖之放大圖，多邊形凸 狀結構204係五邊形凸狀結構。多邊形凸狀結構2〇4包括依 序接合之側面208、侧面210、側面212與側面214。其中， 側面208與侧面214相對，且側面208之一邊及側面214 9 200846712 之一邊均分別與基板202之表面2〇6直接接合。此外，側面 208之相對另—邊則與侧面21〇之一邊接合，侧面之相 對另一邊與側面212之一邊接合，最後侧面21〇之相對另一 邊與側面212之相對另一邊接合，而與基板2〇2之表面 組合而形成一五邊形凸狀結構。 在一較佳實施例中，側面2〇8之長度^與側面Η#之 長度L4相等，而側面21〇之長度L2與側面212之長度“ 相等。然，在本發明之其他實施例中，這些側面之長度^互3 不相同。在一實施例中，侧面208與側面214經延伸後，會 相交而具有交點218，且成三角形狀，而且側面2〇8與側: 14之L伸可互相垂直。舉例而言，側面2⑽與側面214經 延伸後可成等腰直角三角形狀。在本發明中，側面21〇係^ 侧面208之延伸面朝多邊形凸狀結構204的内部偏轉，且側 面212係自側面214之延伸面朝多邊形凸狀結構2〇4的内部 偏轉，因此侧面208與側面214之延伸交點218高於側面 21 〇與側面212之交點216。 在本示範實施例中，側面2〇8與基板202之表面206 的法線222之間夾有一夾角0 !，侧面210與基板2〇2之表 面206的法線222之間夾有一夾角0 2,側面2J2與基板2〇2 之表面206的法線222之間夾有一夾角（9 3，側面214與基 板202之表面206的法線222之間夾有一夾角0 4。夾角沒1 小於夾角6>2，且夾角小於夾角03，如第4圖所示。爽 角β !與夾角<9 2之角度差較佳係大於〇度且小於25度，更 係大於0度且小於15度。另一方面，炎角04與夾角㊀ 3 200846712 之角度差較佳係大於0度且小於25度，更佳係大於〇度且 小於15度。也就是說，侧面21〇與側面2〇8分別自侧面2〇8 之延伸面與侧面214之延伸面朝内偏轉的角度較佳係大於〇 度且小於2 5度’更佳係大於〇度且小於15度。 • 在本發明之一示範實施例中，基板與多邊形凸狀結構之 , 材料的折射係數約為1.58,擴散微粒之折射係數約為1.49, 基板與多邊形凸狀結構中之擴散微粒密度約為7χ1〇3顆 /mm ’擴散微粒尺寸約介於1从m_5 # m，光源距光學板片 > 之距離約為16mm，多邊形凸狀結構之寬度約為〇125mm。 如第6圖所示，當所設置之光學板片為習知三角形凸狀結構 之擴散板時，照度分布之半高寬為48mm，且最高照度與最 低知度之是距為〇.〇〇282Lni/nini2。 如弟7圖所示’並請同時參照第4圖，當側面21 〇及側 面212與法線222之間的夾角<9 2及夾角6> 3同時大於側面 208及側面214與法線222之間的夾角及夾角0 4約5度 時，照度分布之半高寬從習知技術的48mm擴大為57mm， > 且最高照度與最低照度之差距則縮小為〇.〇〇26〇Lm/mm2。因 此，此光學板片200之照度分布較習知三角形結構擴散板之 照度分布均勻。 如第8圖所示，並請同時參照第4圖，當侧面210及側 ，面212與法線222之間的夾角<9 2及夾角<9 3大於側面208 • 及侧面214與法線222之間的夾角6» !及夾角0 4約10度 時，照度分布之半高寬從習知技術的48mm擴大為54mm， 最咼照度與最低照度之差距為〇.〇0293Lm/mm2。因此，此光 11 200846712 學板片200之照度分布亦較習知三角形結構擴散板之照度 分布均勻。 如第9圖所示’並請同時參照第4圖，當侧面21〇及侧 面212與法線222之間的夾角Θ2及失角0 3大於側面2〇8 • 及側面214與法線222之間的夾角沒〗及夾角㊀^約^^产 v ¥ ’知、度分布之半南1攸習知技術的4 8 mm擴大為5 3 mm， 隶南照度與隶低照度之差距為〇.〇〇296Lni/mm2。因此，此光 學板片200之照度分布也較習知三角形結構擴散板之照度 > 分布均勻。 如第10圖所示，並請同時參照第4圖，當側面21〇及 側面212與法線222之間的夾角0 2及夾角0 3大於側面208 及侧面214與法線222之間的夾角（9 ^及夾角0 4約20度 時，照度分布之半高寬為50mm，最高照度與最低照度之差 距為0.00329Lm/mm2。此時，光學板片200之照度分布曲線 的半高寬已不比習知三角形結構擴散板大。因此，在本發明 中侧面210及侧面212與法線222之間的夾角0 2及夾角（9 ί 3大於側面208及側面214與法線222之間的夾角0 !及夾 角0 4的角度小於20度時，光學板片2⑽之照度分布曲線 的半高寬較習知三角形結構擴散板佳。 如第11圖所示，並請同時參照第4圖，當侧面210及 • 側面212與法線222之間的失角及夾角h大於側面208 • 及側面214與法線222之間的夹角0 !及夾角Θ 4約25度 時’照度分布之半高寬為45mm。此時，光學板片200之照 度分布曲線的半高寬已不比習知三角形結構擴散板大。因 12 200846712 此，在本發明中側面210及側面212與法線222之間的夾角 0 2及夾角6» 3大於側面208及侧面214與法線222之間的 夾角Θ !及夾角0 *的角度小於20度時，光學板片2〇〇之照 度分布曲線的半、高寬較習知三角形結構擴散板佳。但是，侧 面210及侧面212與法線222之間的夾角0 2及夾角0 3大 於側面208及侧面214與法線222之間的夾角01及夾角θ 4的角度達25度時，光學板片200之照度分布曲線的半高 寬較習知三角形結構擴散板略差。然而，側面21〇及側面 212與法線222之間的夾角0 2及夾角0 3大於側面208及侧 面214與法線222之間的夾角6^及夾角0 4的角度達25度 時，雖無法有效改善光學板片200之照度分布曲線的半高 覓’但疋光學板片200之照度分布曲線的半高寬仍可獲得維 持而與習知三角形結構擴散板之半高寬約略相當，且如第 11圖所不之照度分布圖，中央凹陷已不明顯，故亦可改善 燈管暗紋現象。 由第12圖可知，當側面21〇及側面212與法線222之 間的爽角0 2及夾角0 3大於侧面208及侧面214與法線222 之間的夾角及夾角04的角度為小於或等於15度時，不 僅可改善照度分布之半高寬，並且相較於夾角0 2及夾角0 3大於夹角及夾角的角度為〇度之一習知三角形微結 構擴散片除仍可維持住最高照度與最低照度之差距，更可進 V改善燈管暗紋現象。因此，此時的光學板片200之照度 分布比較均勻。 在另一示範實施例中，請參照第5圖之光學板片200a 13 200846712 的放大圖。在光學板片200a中，設於基板2〇2表面上之多 邊形凸狀結構204a係梯形凸狀結構。在一較佳實施例中， 製作光學板片200a時，同樣可直接利用微結構加工處理技 術，例如射出成型技術或滾壓成型技術，而形成具多邊形凸 狀結構204a之光學板片200a，此時多邊形凸狀結構2〇4a 與基板202為一體成型之結構。由於利用例如射出成型技術 或滾壓成型技術製作梯形多邊形凸狀結構2〇4a時，較容易 脫模’因此易於製作，而可提升製程可靠度與光學板片2〇〇a 之良率，進而可降低成本。 梯形多邊形凸狀結構204a包括彼此相對之上底面230 與下底面232、以及相對之侧面238與侧面240，其中側面 238與側面240接合在上底面230與下底面232之間。側面 238與側面240經延伸後，會相交而成三角形狀。在本示範 例中，侧面238與側面240經延伸後而成等腰三角形狀。在 一較佳實施例中，此梯形多邊形凸狀結構204a之上底面230 之見度234與下底面232之見度236之間的比值較佳是大於 0且小於或等於5/10。在另一較佳實施例中，此梯形多邊形 凸狀結構204a之上底面230之寬度234與下底面232之寬 度236之間的比值較佳是大於〇且小於或等於2/1 〇。 請參照第13圖，將上述習知三角形結構擴散板與本發 明另一示範例所獲得之照度分布曲線並列比較，上述示範實 施例之梯形多邊形凸狀結構204a中，上底面230之寬度234 與下底面232之寬度236之間的比值為5/10、4/10、3/10、 2/10或1/10時，梯形多邊形凸狀結構2〇4a之照度分布曲線For example, a cold cathode fluorescent lamp (CCFL) or a light emitting diode (LED Ught Bar), according to another object of the present invention, a liquid crystal display comprising at least: a factory liquid crystal display module; and a backlight module, The backlight module includes at least one reflective backplane, at least one light source disposed on the reflective backplane, and an optical panel disposed on the light source. The optical sheet includes at least: a substrate; a plurality of polygonal convex structures disposed on the surface of the substrate. The substrate and the polygonal convex structures are composed of a plurality of diffusing particles composed of a light transmissive material, and are dispersed on the substrate. In the polygonal convex structure, the refractive index of the light-transmitting material of the towel and the refractive index of the diffused particles: According to a preferred embodiment of the present invention, the polygonal convex structure includes a first side and a second side of the ::: The third side and the fourth side are both joined to the surface of the substrate by the side surface and the fourth side. In addition, the intersection of the second side and the third side is lower than the intersection of the first side and the fourth side. [Embodiment] 8 200846712 The invention discloses an optical sheet and an application thereof, which can greatly improve the uniformity of illumination distribution of the light emitted by the light source, improve the illumination of the backlight module, and reduce the number of light sources of the moonlight core group, thereby reducing The cost can reduce the thickness of the backlight module and the liquid crystal display. In order to make the description of the present invention more detailed and complete, reference is made to the following description in conjunction with the drawings of Figures 3 through 14. Referring to Figure 3, there is shown a cross-sectional view of an optical sheet in accordance with a preferred embodiment of the present invention. The optical sheet 200 mainly includes a substrate 202, a plurality of polygonal convex nodes 204, and diffusion particles 220. These polygonal convex structures 204 are disposed on the surface 206 of the substrate 202, and the particles 220 are dispersed in the substrate 202 and all of the polygonal convex structures 204. In a preferred embodiment, when the optical sheet 200 is fabricated, the optical sheet 200 having the polygonal convex structure 204 can be directly formed by using a microstructure processing technique such as an injection molding technique or a roll forming technique. The polygonal convex structure 204 and the substrate 202 are integrally formed. Both the substrate 202 and the polygonal convex structure 204 are composed of a light transmissive material to facilitate light passage. The refractive index of the material of the substrate 2〇2 and the polygonal convex structure 204 is different from the refractive index of the diffusion particles 22〇. The optical plate 2 has a light diffusion function through the difference between the material of the substrate 202 and the polygonal convex structure 204 and the refractive index of the dispersed particles dispersed therein, so that the light emitted by the light source can pass through. The distribution of the outgoing light behind the optical sheet 200 is more uniform. In an exemplary example of a fine example, the polygonal convex structure 204 is a pentagon convex structure. The polygonal convex structure 2〇4 includes a side surface 208, a side surface 210, a side surface 212, and a side surface 214 which are sequentially joined. The side 208 is opposite to the side surface 214, and one side of the side surface 208 and one side of the side surface 214 9 200846712 are directly joined to the surface 2〇6 of the substrate 202, respectively. In addition, the opposite side of the side surface 208 is joined to one side of the side surface 21, the opposite side of the side is joined to one side of the side surface 212, and the opposite side of the second side 21 is joined to the opposite side of the side surface 212, and the substrate is bonded to the substrate. The surface of 2〇2 is combined to form a pentagonal convex structure. In a preferred embodiment, the length of the side 2〇8 is equal to the length L4 of the side Η#, and the length L2 of the side 21〇 is equal to the length of the side 212. However, in other embodiments of the invention, The lengths of the sides are different from each other. In one embodiment, the side 208 and the side 214 are extended to intersect with an intersection 218 and have a triangular shape, and the sides 2〇8 and the sides: 14 For example, the side 2 (10) and the side surface 214 may be formed into an isosceles right-angled triangle shape. In the present invention, the side surface 21 of the side surface 208 is deflected toward the inside of the polygonal convex structure 204, and the side surface The extension of the 212 from the side 214 is directed toward the interior of the polygonal convex structure 2〇4, so that the extended intersection 218 of the side 208 and the side 214 is higher than the intersection 216 of the side 21 〇 and the side 212. In the exemplary embodiment, the side 2〇8 and the normal line 222 of the surface 206 of the substrate 202 have an angle 0!, and the side surface 210 and the normal line 222 of the surface 206 of the substrate 2〇2 have an angle 0 2, the side surface 2J2 and the substrate 2〇2 The normal line 222 of the surface 206 has an included angle (9 3, The face 214 and the normal 222 of the surface 206 of the substrate 202 have an angle of 0. The angle is not less than the angle 6 > 2, and the angle is less than the angle 03, as shown in Fig. 4. The refresh angle β! and the angle < The angle difference of 9 2 is preferably greater than the twist and less than 25 degrees, more than 0 degrees and less than 15 degrees. On the other hand, the angle difference between the angle of inflammation 04 and the angle of 3 200846712 is preferably greater than 0 degrees and less than 25 degrees. Preferably, the angle is greater than the twist and less than 15 degrees. That is, the angle between the side surface 21〇 and the side surface 2〇8 from the extending surface of the side surface 2〇8 and the extending surface of the side surface 214 is preferably greater than 〇. And less than 25 degrees 'better than the twist and less than 15 degrees. · In an exemplary embodiment of the invention, the substrate and the polygonal convex structure, the material has a refractive index of about 1.58, the refractive index of the diffused particles Approximately 1.49, the density of the diffusing particles in the substrate and the polygonal convex structure is about 7χ1〇3/mm. The size of the diffusing particles is about 1 from m_5 #m, and the distance between the light source and the optical plate is about 16 mm. The width of the convex structure is about 〇125mm. As shown in Figure 6, when the optical is set When the film is a diffusion plate of a conventional triangular convex structure, the half width and width of the illuminance distribution are 48 mm, and the distance between the highest illumination and the lowest visibility is 〇.〇〇282Lni/nini2. Referring to Fig. 4 at the same time, the angle between the side surface 21 and the side surface 212 and the normal line 222 <9 2 and the angle 6> 3 is greater than the angle between the side surface 208 and the side surface 214 and the normal line 222 and the angle 0 4 At 5 degrees, the half-height width of the illuminance distribution is expanded from the conventional technique of 48 mm to 57 mm, > and the difference between the highest illuminance and the minimum illuminance is reduced to 〇26〇〇Lm/mm2. Therefore, the illuminance distribution of the optical sheet 200 is uniform than that of the conventional triangular structure diffusion plate. As shown in Fig. 8, and referring to Fig. 4 at the same time, when the side 210 and the side, the angle between the face 212 and the normal 222 < 9 2 and the angle < 9 3 is larger than the side 208 • and the side 214 and the method When the angle between the line 222 is 6»! and the angle 0 4 is about 10 degrees, the half width of the illuminance distribution is expanded from the conventional technique of 48 mm to 54 mm, and the difference between the maximum illuminance and the minimum illuminance is 〇.〇0293 Lm/mm2. Therefore, the illuminance distribution of the light plate 2008 200812 is also uniform than that of the conventional triangular structure diffusion plate. As shown in Fig. 9 and referring to Fig. 4 at the same time, the angle Θ2 and the missing angle 0 3 between the side surface 21〇 and the side surface 212 and the normal line 222 are larger than the side surface 2〇8 • and the side surface 214 and the normal line 222 The angle between the angle is not 〗 〖 and the angle of a ^ ^ ^ ^ production v ¥ 'Knowledge, the distribution of the half of the South 1 攸 攸 know the technology of 4 8 mm expanded to 5 3 mm, the difference between the South illuminance and the low illuminance is 〇. 〇〇 296Lni/mm2. Therefore, the illuminance distribution of the optical sheet 200 is also more uniform than that of the conventional triangular structure diffusion plate. As shown in FIG. 10, and referring to FIG. 4 at the same time, the angle between the side surface 21〇 and the side surface 212 and the normal line 222 and the angle 0 3 are larger than the angle between the side surface 208 and the side surface 214 and the normal line 222. (9 ^ and the angle 0 4 about 20 degrees, the half width of the illuminance distribution is 50mm, the difference between the highest illuminance and the minimum illuminance is 0.00329Lm / mm2. At this time, the half width of the illuminance distribution curve of the optical sheet 200 has been No more than the conventional triangular structure diffusion plate. Therefore, in the present invention, the angle between the side surface 210 and the side surface 212 and the normal line 222 and the angle (9 ί 3 is greater than the angle between the side surface 208 and the side surface 214 and the normal line 222 0! and the angle of the angle 0 4 is less than 20 degrees, the half width of the illuminance distribution curve of the optical plate 2 (10) is better than the conventional triangular structure diffusion plate. As shown in Fig. 11, please also refer to Fig. 4, when The side angle 210 and the angle between the side surface 212 and the normal line 222 are greater than the angle θ between the side surface 208 and the side surface 214 and the normal line 222, and the angle Θ 4 is about 25 degrees. The width is 45 mm. At this time, the half width of the illuminance distribution curve of the optical sheet 200 is no longer than the conventional triangle. The diffusion plate is large. Because of 12 200846712, in the present invention, the angle 0 2 and the angle 6» 3 between the side surface 210 and the side surface 212 and the normal line 222 are larger than the angle between the side surface 208 and the side surface 214 and the normal line 222! When the angle of the angle 0* is less than 20 degrees, the half width and the height width of the illuminance distribution curve of the optical sheet 2 较 are better than those of the conventional triangular structure diffusion plate. However, the angle between the side surface 210 and the side surface 212 and the normal line 222 When the angle 0 0 and the angle 0 3 are greater than the angle 01 between the side surface 208 and the side surface 214 and the normal line 222 and the angle θ 4 is 25 degrees, the full width at half maximum of the illuminance distribution curve of the optical sheet 200 is larger than that of the conventional triangular structure. The angle between the side surface 21〇 and the side surface 212 and the normal line 222 is greater than the angle between the side surface 208 and the side surface 214 and the normal line 222 and the angle of the angle 0 4 is 25 However, although the half height of the illuminance distribution curve of the optical sheet 200 cannot be effectively improved, the full width at half maximum of the illuminance distribution curve of the optical sheet 200 can be maintained while maintaining the full width at half maximum of the conventional triangular structure diffusion plate. Approximate, and as shown in Figure 11, the illuminance map, fovea The trap is not obvious, so it can also improve the dark streaks of the lamp. As can be seen from Fig. 12, when the side 21〇 and the side surface 212 and the normal 222 between the cool angle 0 2 and the angle 0 3 are larger than the side 208 and the side 214 When the angle between the normal line 222 and the angle of the angle 04 is less than or equal to 15 degrees, not only the half-height width of the illuminance distribution can be improved, but also the angle between the angle 0 2 and the angle 0 3 is larger than the angle and the angle 〇. One of the conventional triangular microstructure diffusers can maintain the difference between the highest illuminance and the minimum illuminance, and can further improve the dark streaks of the lamp. Therefore, the illuminance distribution of the optical sheet 200 at this time is relatively uniform. In another exemplary embodiment, please refer to the enlarged view of the optical sheets 200a 13 200846712 of FIG. In the optical sheet 200a, the polygonal convex structure 204a provided on the surface of the substrate 2A is a trapezoidal convex structure. In a preferred embodiment, when the optical sheet 200a is fabricated, the optical sheet 200a having the polygonal convex structure 204a can be formed directly by using a microstructure processing technique such as an injection molding technique or a roll forming technique. The polygonal convex structure 2〇4a and the substrate 202 are integrally formed. Since the trapezoidal polygonal convex structure 2〇4a is produced by, for example, injection molding technology or roll forming technology, it is easier to demold out', so that it is easy to manufacture, and the process reliability and the yield of the optical sheet 2〇〇a can be improved, and further Can reduce costs. The trapezoidal polygonal convex structure 204a includes an upper surface 230 and a lower surface 232 opposite to each other, and an opposite side 238 and a side 240, wherein the side surface 238 and the side surface 240 are joined between the upper bottom surface 230 and the lower bottom surface 232. After the side 238 and the side 240 are extended, they intersect to form a triangular shape. In the present example, the side surface 238 and the side surface 240 are extended to form an isosceles triangle shape. In a preferred embodiment, the ratio between the visibility 234 of the top surface 230 of the trapezoidal polygonal convex structure 204a and the visibility 236 of the lower surface 232 is preferably greater than 0 and less than or equal to 5/10. In another preferred embodiment, the ratio between the width 234 of the upper surface 230 of the trapezoidal polygonal structure 204a and the width 236 of the lower surface 232 is preferably greater than 〇 and less than or equal to 2/1 〇. Referring to FIG. 13, the above-mentioned conventional triangular structure diffusion plate is juxtaposed with the illuminance distribution curve obtained by another exemplary embodiment of the present invention. In the trapezoidal polygonal convex structure 204a of the above exemplary embodiment, the width 234 of the upper bottom surface 230 is The illuminance distribution curve of the trapezoidal polygonal convex structure 2〇4a when the ratio between the widths 236 of the lower bottom surface 232 is 5/10, 4/10, 3/10, 2/10 or 1/10
200846712 的起伏知度較習知三角形έ士盖 曲線缓和，而可改盖燈^^板（比值為G)之照度分布 料凸狀結構⑽之上底面⑽之寬度以與下底面2；； 之見度236之間的比值為謂或”⑺時，梯形多邊形凸狀 結構純之照度分布曲線的起伏程度不僅較習知三角形結 構擴散板之照度分布曲線緩和，而可改善燈管暗紋現象，同 時更可避免|sc習知微結構擴散板而言會增加最高照度與最 低照度之間的照度差，而可兼顧照度之均齊度。 本發明之光學板片可適用於背光模組與液晶顯示器。請 參照第14圖’其係繪示依照本發明一較佳實施例的一種液 晶顯示器之裝置示意圖。液晶顯示器则主要包括液晶顯示 面板308與背光模組3〇2。背光摸組3〇2較佳為直下式背光 模組。背光模組302至少包括反射背板3〇4、至少一光源3〇6 以及光學板片200或光學板片2〇〇a。在本示範實施例中， 為光杈組302係採用光學板片2〇〇。光源3〇6設於反射背板 304上並位於反射背板3〇4内，且光學板片2〇〇設置在光源 306之上方，以改善光源3〇6之出光品質，如第12圖所示。 在本發明中，光源306可為條狀光源，例如冷陰極螢光燈與 舍光一極體光條’亦可為點狀光源，例如點狀之發光二極 體。液晶顯示面板308設置在背光模組302之光學板片200 上，而使背光模組302位於液晶顯示面板3〇8之背面，藉以 提供液晶顯示面板308背光源。透過光學板片2〇〇之調整修 飾，可有效改善光源306之出射光的照度分布均勻度。由於 照度分布均勻度獲得有效改善，因此背光模組3〇2之照度燈 15 200846712The ups and downs of 200846712 are moderated compared with the conventional triangle gentleman cover curve, and the illuminance of the cover plate (the ratio of G) can be changed to the width of the upper surface (10) of the convex structure (10) and the lower bottom surface 2; When the ratio between the visibility 236 is or "(7), the undulating degree of the illuminance distribution curve of the trapezoidal polygonal convex structure is not only moderated compared with the illuminance distribution curve of the conventional triangular structure diffusion plate, but the lamp darkening phenomenon can be improved. At the same time, it is possible to avoid the illuminance difference between the highest illuminance and the minimum illuminance, and the illuminance uniformity can be considered. The optical sheet of the invention can be applied to the backlight module and the liquid crystal. Referring to FIG. 14 , a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention is shown. The liquid crystal display mainly includes a liquid crystal display panel 308 and a backlight module 3〇2. 2 is preferably a direct type backlight module. The backlight module 302 includes at least a reflective back plate 3〇4, at least one light source 3〇6, and an optical plate 200 or an optical plate 2〇〇a. In the exemplary embodiment, For light The 杈 group 302 is an optical plate 2 〇〇. The light source 〇6 is disposed on the reflective back plate 304 and located in the reflective back plate 3〇4, and the optical plate 2 is disposed above the light source 306 to improve the light source. The light quality of 3〇6 is as shown in Fig. 12. In the present invention, the light source 306 can be a strip light source, such as a cold cathode fluorescent lamp and a fluorescent light strip, which can also be a point light source, such as a dot. The liquid crystal display panel 308 is disposed on the optical plate 200 of the backlight module 302, and the backlight module 302 is disposed on the back surface of the liquid crystal display panel 〇8, thereby providing a backlight of the liquid crystal display panel 308. The adjustment of the optical plate 2 can effectively improve the uniformity of the illumination distribution of the light emitted by the light source 306. Since the uniformity of the illumination distribution is effectively improved, the illumination module of the backlight module 3〇2 15 200846712
管暗紋現象（Lamp Mura)可望消除，或者亦可減少光源3〇6 之數量，進而可改善液晶顯示器300之顯示品質，且可降低 製造成本。而且，在照度分布均勻度獲得提升後，亦可縮減 光源306與光學板片200之間的距離，如此—來，可縮減背 光模組302之厚度，液晶顯示器3〇〇之厚度進一步獲得縮 減。此外，本發明之光學板片200兼具擴散與照度提=之功 能，因此光學板片200可同時提供多種光學臈片之功能，而 使背光模組302可無需設置多種光學膜片，甚至僅設置一光 學板片200即可滿足一定需求。因此，不僅可進一=降低成 本，更可進一步縮減背光模組之厚度，並減輕背光模組3〇2 之重量及體積。 由上述本發明較佳實施例可知，本發明之一優點為本發 明之光學板片可有效擴展光源之照度半高寬，因此可大幅提 升照度分布之均勻度、改善或消除燈管暗紋現象（Lamp Mura) ° 由上述本發明較佳實施例可知，本發明之另一優點就是 因為本發明之背光模組僅利用一光學板片即可將改善光源 之照度分布，因此不僅可提升背光模組之照度均齊度，更可 無需加設多種光學膜片，有效縮減背光模組之厚度，並因改 善燈管暗紋現象（Lamp Mura)而可減少光源之數量，進而可 降低背光模組之成本與重量。 由上述本發明較佳實施例可知，本發明之又一優點就是 因為藉由使用可擴大光源之照度半高寬的光學板片，可提升 液晶顯示器之顯示品質，縮減液晶顯示器之厚度，減少光源 16 200846712 之數Ϊ進而降低液晶顯示器製作成本。 雖然本發明已以一較佳實施例揭露如上，然其並非用以 限定本發明，任何在此技術領域中具有通常知識者，在不脫 離本發明之精神和範圍内，當可作各種之更動與潤飾，因此 ， 本發明之保護範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 第1圖係繪示傳統擴散板之剖面圖。 藝第2 Α圖係繪示未經擴散板、經傳統擴散板以及經習知 二角形結構擴散板後之光分布曲線局部示意圖。 第2B圖係繪示未經擴散板、經傳統擴散板以及經習知 三角形結構擴散板後之光分布曲線示意圖。 第3圖係繪示依照本發明一較佳實施例的一種光學板 片之剖面圖。 第4圖係繪示依照本發明一較佳實施例的一種光學板 片之多邊形凸狀結構的放大示意圖。 馨 第5圖係繞示依照本發明另一較佳實施例的一種光學 板片之多邊形凸狀結構的放大示意圖。 第6圖係緣示經過習知三角形結構擴散板後之光照度 分布曲線圖。 • 第7圖係緣示經過本發明第一較佳實施例的一種擴散 ^ 板後之光照度分布曲線圖。 第8圖係繪示經過本發明第二較佳實施例的一種擴散 板後之光照度分布曲線圖。 17 200846712 第9圖係繪示經過本發明第三較佳實施例的一種擴散 板後之光照度分布曲線圖。 第10圖係繪示經過本發明第四較隹實施例的一種擴散 板後之光照度分布曲線圖。 第11圖係繪示經過本發明第五較佳實施例的一種擴散 板後之光照度分布曲線圖。 第12圖係繪示經過習知三角形結構擴散板與本發明一 較佳實施例的擴散板後之光照度分布曲線圖。 第13圖係繪示經過習知三角形結構擴散板與本發明另 一較佳實施例的擴散板後之光照度分布曲線圖。 弟14圖係繪示依照本發明一較佳實施例的一種液晶顯 示器之裝置示意圖。The Lamp Mura is expected to be eliminated, or the number of light sources 3〇6 can be reduced, thereby improving the display quality of the liquid crystal display 300 and reducing the manufacturing cost. Moreover, after the illuminance distribution uniformity is improved, the distance between the light source 306 and the optical sheet 200 can also be reduced, so that the thickness of the backlight module 302 can be reduced, and the thickness of the liquid crystal display 3 进一步 can be further reduced. In addition, the optical sheet 200 of the present invention has the functions of diffusion and illuminance, so that the optical sheet 200 can simultaneously provide various optical slab functions, so that the backlight module 302 can be disposed without a plurality of optical films, or even only Setting an optical plate 200 can meet certain needs. Therefore, not only can the cost of the backlight module be further reduced, but the weight and volume of the backlight module 3〇2 can be further reduced. According to the preferred embodiment of the present invention, one of the advantages of the present invention is that the optical sheet of the present invention can effectively expand the illuminance half-height of the light source, thereby greatly improving the uniformity of the illumination distribution and improving or eliminating the dark streaks of the lamp. (Lamp Mura) ° According to the preferred embodiment of the present invention, another advantage of the present invention is that the backlight module of the present invention can improve the illumination distribution of the light source by using only one optical plate, thereby not only improving the backlight mode. The illuminance of the group is uniform, and it is not necessary to add a variety of optical films, which effectively reduces the thickness of the backlight module, and reduces the number of light sources by improving the Lamp Mura phenomenon, thereby reducing the backlight module. Cost and weight. According to the preferred embodiment of the present invention, another advantage of the present invention is that the display quality of the liquid crystal display can be improved, the thickness of the liquid crystal display can be reduced, and the light source can be reduced by using an optical sheet which can enlarge the illumination width and width of the light source. 16 200846712 The number of LCD monitors further reduces the cost of LCD display production. Although the present invention has been described above in terms of a preferred embodiment, it is not intended to limit the invention, and it is intended that various modifications may be made without departing from the spirit and scope of the invention. And the scope of the present invention is defined by the scope of the appended claims. [Simple description of the drawing] Fig. 1 is a cross-sectional view showing a conventional diffusing plate. The second diagram of the art shows a partial schematic diagram of the light distribution curve after the diffusion plate, the conventional diffusion plate, and the conventional diffusion plate of the polygonal structure. Fig. 2B is a schematic view showing a light distribution curve of a non-diffusion plate, a conventional diffusion plate, and a conventional triangular structure diffusion plate. Figure 3 is a cross-sectional view showing an optical sheet in accordance with a preferred embodiment of the present invention. Fig. 4 is an enlarged schematic view showing a polygonal convex structure of an optical sheet according to a preferred embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 5 is an enlarged schematic view showing a polygonal convex structure of an optical sheet according to another preferred embodiment of the present invention. Fig. 6 is a graph showing the illuminance distribution curve after passing through a conventional triangular structure diffusion plate. • Fig. 7 is a graph showing the illuminance distribution after the diffusion plate of the first preferred embodiment of the present invention. Fig. 8 is a graph showing the illuminance distribution after a diffusion plate according to a second preferred embodiment of the present invention. 17 200846712 Fig. 9 is a graph showing the illuminance distribution after a diffusion plate according to a third preferred embodiment of the present invention. Fig. 10 is a graph showing the illuminance distribution after a diffusion plate of the fourth comparative embodiment of the present invention. Fig. 11 is a graph showing the illuminance distribution after the diffusion plate of the fifth preferred embodiment of the present invention. Fig. 12 is a graph showing the illuminance distribution after the conventional triangular structure diffusion plate and the diffusion plate of a preferred embodiment of the present invention. Figure 13 is a graph showing the illuminance distribution after the diffusion plate of the conventional triangular structure and the diffusion plate of another preferred embodiment of the present invention. Figure 14 is a schematic view of a liquid crystal display device in accordance with a preferred embodiment of the present invention.
主要元件符號說明】 100 :擴散板 104 :三角形凸狀結構 112 :曲線 200 :光學板片 202 :基板 204a :多邊形凸狀結構 208 :側面 212 :側面 216 :交點 220 :擴散微粒 10 2 ·基板 110 :曲線 114 :曲線 200a :光學板片 204 :多邊形凸狀結構 206 :表面 210 :侧面 214 :側面 218 :交點 222 :法線 18 200846712 230 :上底面 232 :下底面 234 :寬度 236 :寬度 240 :側面 302 :背光模組 306 :光源 Li :長度 L3 :長度 0 1 :夾角 0 3 :夾角 :半高寬 w3 :半高寬 △ l2 :照度差 238 :侧面 300 :液晶顯示器 304 :反射背板 308 :液晶顯示面板 L2 :長度 L4 :長度Main component symbol description] 100: diffusion plate 104: triangular convex structure 112: curve 200: optical plate 202: substrate 204a: polygonal convex structure 208: side surface 212: side surface 216: intersection point 220: diffusion particle 10 2 · substrate 110 Curve 114: Curve 200a: Optical plate 204: Polygonal convex structure 206: Surface 210: Side 214: Side 218: Intersection 222: Normal 18 200846712 230: Upper bottom surface 232: Lower bottom surface 234: Width 236: Width 240: Side 302: backlight module 306: light source Li: length L3: length 0 1 : angle 0 3 : angle: half height width w3: half height width Δ l2: illuminance difference 238: side 300: liquid crystal display 304: reflective back plate 308 : LCD panel L2: length L4: length
(9 2 :夾角 <9 4 :夾角 W2 :半高寬 AL!:照度差 △ L3 :照度差(9 2 : angle < 9 4 : angle W2 : half height and width AL!: illuminance difference △ L3 : illuminance difference
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