200821629 \ 九、發明說明： 【發明所屬之技術領域】 本發明係有關一種調光結構，尤指一種線性非球面之調 光結構。 【先前技術】 液晶面板本身無法發出光線，需要藉由背光模組來提供 顯示器之光源，一般而言，大尺寸液晶顯示器的背光源主要 是採直下式，而直下式背光源可以藉由燈管的增加，或使用 _ 調光結構（稜鏡片）來達到大尺寸液晶顯示器的亮度要求。 請參閱台灣專利公告第M266466號『增加亮度之光擴散板 之結構』，其中揭露出習知之直下式背光模組之結構，包含了 一第一稜鏡片、一第二稜鏡片與一光擴散膜等。目前在背光 模組中，常見的增亮技術是搭配一片或兩片不同方向的稜鏡 片，其原理乃是利用稜鏡之折射率以及稜鏡角度將入射光線 折射後，通過鋸齒狀的光出射面控制其射出角度，讓原先經 由擴散板而擴散開來的光線再度集中，並減少光耗損率，而 達到增加亮度之目的。稜鏡片一般是用PET聚酯或聚碳酸脂材 料製成75〜230μιη的薄片，在薄片的表面形成間距為 24〜11 Ομπι，頂角為90〜110度的長條狀稜鏡陣列，因其光學結 構以及折射率，而具有聚光的作用。當使用一片直角形狀的 稜鏡片時，則正面亮度可改善h6倍以上，若使用兩片呈垂直 排列的稜鏡片，則正面亮度可改善2倍以上，然而其頂角為 5 200821629 • 9(M1G度之結構僅具有增光功能，需要再額外搭配一片光擴 散膜，且其頂角極易在製造時被碰觸而導致損毀，造成其成 本較鬲、良率偏低。 請再參閱美國已公告專利US6280063號，其揭露出一種 受度增強結構’透明基片上具有-第-主表面，它包括一系 列圓頂的線性稜柱；以及具有許多光散射突起的第二主表 面。所述圓頂可用弦寬（chord wi dth)、橫截面底部寬（th _ Width)和曲率半徑來加以定義，其中弦寬約等於橫截面底部 間寬的20-40%，曲率半徑約等於橫截面底部間寬的2〇_5〇%， 在其中-個較好的實例中’第二主表面與基片連成一體，即 所述突起呈由基片材料製成隆起狀，在另一個實例中，第二 表面由一層在基片上的樹脂所形成，當第二主表面是由單獨 的樹脂層形成時，所述突起可以呈分散在樹脂層中的顆粒 狀，或者可以與樹脂層本身連成一體（即呈由樹脂製成的隆 籲起狀）。然而，橫截面中在圓項兩邊係呈一直線狀與底部相 連，即該線性稜柱並非一連續的弧線’除了圓頂之外，兩側 為一平直的側邊，在實際模擬測試之下，中心增益僅約為 1 · 45 倍。 而在美國已公告專利US5592332,則揭露出一種球面結 構之稜鏡片（lenticular lens)，其中心增益也僅能達到κ 39 倍左右。其它相關專利尚可參閱台灣專利公告第Μ291542 6 200821629 • 號，以及美國已公告專利第5175030、5183597、6277471號， 皆對增党、擴散技術有進一步描述。 【發明内容】 本發明目的t一，在提供一種調光結肖，其具有較佳的 集光特性，以及較習知結構更高的中心增益。 本發明目的之―，在提供—種兼具有增光以及光擴散效 果之調光結構。 • 本發明目的之三，在增加調光結構的製作良率。 為實現上述目的，本發明揭露之較佳實施例中，係於一 基片上設有一光入射面與一光出射面，該光出射面具有複數 朝方向L伸之折光部，與該折光部延伸方向相交之橫斷面 下其頂端形狀為-具有曲率之第_狐形，該第—娘形之曲 率半徑係介於該折光部底部寬度的卜10%之間，且該折光部 之兩侧邊則刀別為一與該第一弧形無段差相連且曲率半徑為 _連續《L化之第_弧形，藉此，該調光結構兼具集光與光擴散 效果並可彡曰加調光結構之集光性，達到中心增益u 1倍以 上之表現，且其頂端為一弧形更能確保在製造時不易碰損， 以達較佳之良率。 【實施方式】 有關本發月之詳細說明及技術内容，現就配合圖式說明 如下： 月多閱第1圖』，係本發明較佳實施例的結構圖，如圖 7 200821629 所不·本發明為一種線性非球面調光結構，係於一基片1 〇 上/、有光入射面20與一光出射面3〇，該光出射面30具有 複數朝同一方向延伸之折光部40，其中該複數折光部4〇與 該基片10可為一體不可分離的相同材質，《者折光部40與 該基片10為不同材質，即複數折光部40與該基片1〇之間具 有一介面存在。 请參閱『第2圖』，係本發明較佳實施例的側面圖，如圖 所不：與該折光部4〇延伸方向相交之橫斷面，其頂端形狀為 有曲率之第孤形41，該第一弧形41之曲率半徑43係 介於該折光部40底部寬度44的hg%之間，實際尺寸上來 說’第一孤形41的曲率半徑43係介於^至3〇”之間， :從中選擇任意數值(例如―)，或任意區間内的數值來 製作，而該折光部4G底部寬度44係介於2G//m至刚㈣ 之間（例如為50/ζπι)。 第弧形41之兩側則分別為一與該第一弧形41呈無段 差相連，且曲率半徑為連續變化之第二弧形42,其中該複數 折光部4G分別自其底部至頂部具有—高度，且該高度可介於 至50 " m之間，本實施例中該複數折光部之高度係 同㊉基片10上之複數折光部4。其高度亦可為不相同 而呈上、下起伏，如『第3圖』所示，該複數折光部40、4〇a、 _自其底部至項部分別具有不同高度，然而，頂端形狀為 8 200821629 具有曲率之第-弧形41、41a、.兩側第二孤形42 42b為無段差相連，且曲率為連續變化則如同前述。200821629 \ IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD The present invention relates to a dimming structure, and more particularly to a linear aspherical dimming structure. [Prior Art] The liquid crystal panel itself cannot emit light, and the backlight module is required to provide the light source of the display. Generally, the backlight of the large-size liquid crystal display is mainly used in a direct type, and the direct-lit backlight can be used in a light tube. Increase, or use _ dimming structure (smear) to achieve the brightness requirements of large-size LCD. Please refer to Taiwan Patent Publication No. M266466 "Structure of Light-Diffusing Plate for Increasing Brightness", which reveals the structure of a conventional direct-lit backlight module, comprising a first cymbal, a second cymbal and a light diffusing film. Wait. At present, in the backlight module, the common brightening technique is to match one or two slabs in different directions. The principle is to refract incident light by using the refractive index and the 稜鏡 angle, and then output through the zigzag light. The surface controls the angle of incidence, so that the light diffused through the diffusion plate is again concentrated, and the light loss rate is reduced, thereby increasing the brightness. The ruthenium sheet is generally made of PET polyester or polycarbonate material, and is formed into a sheet of 75 to 230 μm, and a long strip of iridium array having a pitch of 24 to 11 Ομπι and an apex angle of 90 to 110 degrees is formed on the surface of the sheet. The optical structure and the refractive index have the function of collecting light. When a piece of right-angled cymbal is used, the front brightness can be improved by more than h6 times. If two pieces of vertically arranged cymbals are used, the front brightness can be improved by more than 2 times, but the apex angle is 5 200821629 • 9 (M1G The structure of the degree only has a light-increasing function, and it needs to be additionally equipped with a light-diffusing film, and its top corner is easily touched and damaged during manufacturing, resulting in a relatively low cost and low yield. Please refer to the US announcement. No. 6,280,063, which discloses a degree-enhancing structure having a - major surface on a transparent substrate comprising a series of dome-shaped linear prisms; and a second major surface having a plurality of light-scattering protrusions. The chord wi dth, the width at the bottom of the cross section (th _ Width), and the radius of curvature are defined, where the chord width is approximately equal to 20-40% of the width between the bottoms of the cross sections, and the radius of curvature is approximately equal to the width between the bottoms of the cross sections. 2〇_5〇%, in one of the preferred examples, 'the second major surface is integral with the substrate, i.e., the protrusions are ridged from the substrate material, and in another example, the second Surface by one Formed by a resin on the substrate, when the second main surface is formed of a separate resin layer, the protrusions may be in the form of particles dispersed in the resin layer, or may be integrated with the resin layer itself (ie, by resin) In the cross section, the two sides of the circle are connected in a straight line to the bottom, that is, the linear prism is not a continuous arc. In addition to the dome, the sides are a flat side. On the other hand, under the actual simulation test, the center gain is only about 1.45 times. In the United States, US Pat. No. 5,592,332 discloses a lenticular lens with a spherical structure, and its center gain can only reach κ 39. Other related patents can be further referred to in Taiwan Patent Publication No. 291542 6 200821629 No., and US Published Patent Nos. 5175030, 5183597, and 6274471, all of which further describe the party and diffusion technologies. t, in providing a dimming junction, which has better concentrating characteristics, and a higher center gain than the conventional structure. - A dimming structure having both a brightness enhancement and a light diffusing effect. 3. The third object of the present invention is to increase the fabrication yield of the dimming structure. To achieve the above object, in a preferred embodiment of the present invention, The substrate is provided with a light incident surface and a light exit surface. The light exit surface has a plurality of light-receiving portions extending in the direction L. The cross-section of the cross-section intersecting the extending direction of the light-receiving portion has a shape of a top surface having a curvature. The curvature radius of the first-mother-shaped shape is between 10% of the width of the bottom portion of the refractive portion, and the two sides of the refractive portion are different from the first curved shape and the radius of curvature is _Continuous "L-shaped _ arc shape, whereby the dimming structure has both light collecting and light diffusing effects and can increase the light collecting property of the dimming structure, achieving a performance of more than 1 times the central gain u, and The shape of the top is a curved shape to ensure that it is not easily damaged during manufacturing to achieve better yield. [Embodiment] The detailed description and technical contents of this month are described below with reference to the following drawings: Figure 1 is a more detailed view of the preferred embodiment of the present invention, as shown in Figure 7 200821629. The invention is a linear aspherical dimming structure, which is disposed on a substrate 1 /, has a light incident surface 20 and a light exit surface 3 〇, and the light exit surface 30 has a plurality of refracting portions 40 extending in the same direction, wherein The plurality of refractive portions 4 and the substrate 10 may be the same material that is inseparable from the substrate. The refractive portion 40 and the substrate 10 are made of different materials, that is, the interface between the plurality of refractive portions 40 and the substrate 1 presence. Please refer to FIG. 2, which is a side view of a preferred embodiment of the present invention. As shown in the figure, a cross section intersecting the extending direction of the refractive portion 4〇 has a shape of a top end having a curvature of the first shape 41. The radius of curvature 43 of the first curved shape 41 is between hg% of the bottom width 44 of the refractive portion 40. In actual size, the radius of curvature 43 of the first orphan 41 is between ^ and 3〇. , : Select any value (such as "), or the value in any interval to make, and the bottom width 44 of the refractive portion 4G is between 2G / / m and just (four) (for example, 50 / ζ πι). The two sides of the shape 41 are respectively connected to the first curved shape 41 without a step, and the radius of curvature is a continuously changing second curved shape 42, wherein the plurality of refractive portions 4G have a height from the bottom to the top, respectively. And the height may be between 50 " m. In this embodiment, the height of the plurality of refractive portions is the same as that of the plurality of refractive portions 4 on the ten substrate 10. The height may also be different, and the upper and lower undulations may be up and down. As shown in FIG. 3, the plurality of refractive sections 40, 4〇a, and _ have different heights from the bottom to the item respectively. However, the top having a shape of curvatures 8200821629 - 41,41a ,. arcuate sides of the second arc-shaped segment 42 42b is not connected to the difference, and the curvature changes continuously as described above.
^閱第4圖』’係本發明另一較佳實施例的俯視圖， β斤丁在之刚的實施例中，基片1〇上之複數折光部4〇 概呈平行併排且朝同-方向延伸，本實施例中，該複數折光 部40係於基片1Ga的延伸方向上，更具有―彎曲之延伸軌跡 而呈左右彎曲，可有效消除顯示器上波紋（Moire)的產生， 而具有勻光的效果。承上所述，本發明係提供—種線性非球 面調光結構，其具有較佳㈣光特性，以及較習知結構更高 的中〜增盈，在實際的模擬試驗中（請參閱『第5圖』），本 發明所代表之實驗曲線！，可達中心增益1 · 51以上之表現， 較美國已公告專利US6280063號中心增益ι 45左右之表現更 為優良，且本發明之折光部4〇頂端為第一弧形41，侧邊為 第二弧形42之非球面結構，更具有光擴散效果，且頂端之第 一弧形41亦能確保在製作時不易碰損，而具有高良率之表 現❶ 请參閱『第6圖』，係本發明較佳實施例之平面座標圖， 如圖所示：第一、第二弧形41、42上所包含之各點係定義自” 非球面曲率方程式 ” （Aspheric curvature formula ): 為p2+知2Mp2+4〆’其中’ P 等於 V 一―F~ 9 200821629 Z +7，X、Υ、Z分別為空間之三軸，R係該第一弧形之曲 率半徑，6為圓錐係數（conicconstant)，在的情形下， 該第一、第二弧形41、42為一橢圓形（ellipse)軌跡；在 下，該第一、第二弧形41、42則為一拋物線（parab〇la)轨 跡；而在本發明中，〆4，且該第一、第二弧形41、仏為 一雙曲線（hyperbola)結構；為〜為。則分別為立體表面係數， 於本實施例之橫斷面下，γ=〇，為〜‘二〇，R=〇. 〇〇5随，π —I 6， Η點之X軸座標=〇· 〇5fflm，套入方程式中求得H點之z軸座標 d.0568mm，藉此，可定義出第一、第二弧形41、42上各點 所組成之軌跡。 以上僅為本發明的較佳實施例而已，並非用來限定本發 明之實施範圍，即凡依本發明申請專利範圍之内容所為的等 效1化與修飾’皆應為本發明之技術範壽。 【圖式簡單說明】 第1圖’係本發明較佳實施例之構造圖 第2圖’係本發明較佳實施例之侧視圖 第3圖’係本發明另一較佳實施例之侧視圖 第4圖，係本發明另一較佳實施例之俯視圖 第5圖，係本發明之模擬實驗圖 第6圖’係本發明之較佳實施例之平面座標圖 【主要元件符號說明】 •本發明實驗曲線 200821629 10、 10a · • · · ·基片 20 - •···光入射面 30、 30a · • · · ·光出射面 40、 40a、 40b · · · · • · · ·折光部 41、 41a、 41b · · · · 42、 ‘ 42a、 ‘ 42b · · · · • ·——·第二弧形 43 _ • · · ·曲率半徑 44 . • · ••折光部底部寬度4 is a top view of another preferred embodiment of the present invention. In the embodiment of the present invention, the plurality of refractive portions 4 on the substrate 1 are parallel and side by side and facing in the same direction. In the embodiment, the plurality of refracting portions 40 are in the extending direction of the substrate 1Ga, and have a curved trajectory to bend left and right, which can effectively eliminate the generation of moiré on the display, and has uniform light. Effect. In view of the above, the present invention provides a linear aspherical dimming structure having better (four) optical characteristics and a higher mid-weight gain than conventional structures in actual simulation tests (see "The 5图』), the experimental curve represented by the present invention! The performance of the center gain of 1 · 51 or more is better than the center gain ι 45 of the US published patent US6280063, and the top end of the refracting portion 4 of the present invention is the first curved 41, and the side is the first The aspherical structure of the two curved 42 has a light diffusing effect, and the first curved shape 41 at the top also ensures that it is not easily damaged during production, and has a high yield performance. Please refer to "Fig. 6" The plane coordinate diagram of the preferred embodiment of the invention, as shown in the figure: the points included in the first and second arcs 41, 42 are defined from the "Aspheric curvature formula": p2+ knows 2Mp2 +4〆' where 'P is equal to V-F~9 200821629 Z +7, X, Υ, Z are the three axes of space, R is the radius of curvature of the first arc, and 6 is the conicconstant. In the case, the first and second arcs 41, 42 are an ellipse trajectory; below, the first and second arcs 41, 42 are a parab〇la trajectory; In the present invention, 〆4, and the first and second arcs 41 and 仏 are a double curve. Hyperbola) structure; ~ is of. Then, they are the three-dimensional surface coefficients. In the cross-section of this embodiment, γ=〇 is ~'2〇, R=〇. 〇〇5 with, π—I 6, the X-axis coordinate of the Η point=〇· 〇5fflm, nested in the equation to find the z-axis coordinate d.0568mm of the H point, whereby the trajectory composed of the points on the first and second arcs 41, 42 can be defined. The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the equivalents and modifications of the content of the patent application of the present invention should be the technical life of the present invention. . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural view of a preferred embodiment of the present invention. FIG. 2 is a side view of a preferred embodiment of the present invention. FIG. 3 is a side view of another preferred embodiment of the present invention. Figure 4 is a plan view of another preferred embodiment of the present invention. Figure 5 is a plan view of a preferred embodiment of the present invention. Invention Experiment Curve 200821629 10, 10a · · · · · Light-emitting surface 30, 30a · · · · · Light exit surface 40, 40a, 40b · · · · · · · · Refractive part 41 , 41a, 41b · · · · 42, ' 42a, ' 42b · · · · · · · · Second arc 43 _ • · · · Curvature radius 44. • · •• Width of the bottom of the refracting part
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