200927470 九、發明說明： 【發明所屬之技術領域】 本發明涉及一種稜鏡片及其製造方法。 【先前技術】 請參見圖1，所示為一種採用習知棱鏡片之液晶顯示 裝置100。液晶顯示裝置100包括框架11與設於該框架11 内部之複數光源12、依次設置於光源12上方並蓋住框架 11之一擴散板13、一稜鏡片10及一液晶面板15。其中， 擴散板13内一般含有散射粒子，用以擴散光線。如圖2 所示，棱鏡片10包括透明基板101、形成於透明基板101 上之透鏡層103。透鏡層103上具有複數長條形V型凸起 105。每一長條形凸起105從稜鏡片之一側邊向另一側邊延 伸，且複數長條形凸起105連續並排排列。該透鏡層103 一般係藉由於透明基板101上塗佈紫外線固化樹脂並加以 光照固化形成。 使用時，由複數光源12產生之光線進入擴散板13被 均勻擴散後，其繼續進入棱鏡片10,於稜鏡片10之長條 形凸起105之作用下使出射光線發生一定程度之聚集，從 而提高液晶顯示裝置100於特定視角範圍内之亮度。 然而，由於複數長條形凸起105連續並排排列，使用 時，該複數長條形凸起105之連續並排排列容易與液晶面 板15圖元之排佈相重疊，而使得液晶顯示裝置100容易發 生疊紋干涉（Moir0 Patterns )，從而影響液晶顯示裝置100 之顯示效果。 200927470 為避免疊紋干涉現象之發生，通常會於該稜鏡片ι〇 -與液晶面板15之間設置一上擴散片14。上擴散片i4亦具 有擴散光之作用，光線經過上擴散片14進一步散射後，^ 避免液晶顯示裝置100顯示時疊紋干涉現象之產生。然 而，光線於上擴散片14中傳輸時，部分光線會被上擴散=、 14吸收而造成部分光線損失；且上擴散片14之使用還將 增加光線於傳輸過程中之介面數量，從而增加光線傳輪之 介面損失，故上擴散片14之使用會減少光線之利用率，使 液日日.顯不裝置1〇〇之顯示亮度降低。 【發明内容】 ”繁於上述狀〉兄，有必要提供一種具有冑度高且可避免 疊紋干涉之稜鏡片及其製造方法。 一種稜鏡片之製造方法，其包括：提供—旋轉切削模 仁之成型面之旋轉切削裝置，該旋轉切削裝置包括一可轴 向，轉之刀刀及與該刀刃相對之位移控制單元，該位移控 ❹制早兀用以控制模仁至刀刃之相對位移；刀刀切削模仁之 成型面以形成複數長條狀凹槽，且於形成其中至少一長條 狀凹槽之過程中，位移控制單元使模仁至刀刀之相對位移 ^變化，這樣，該至少—長條狀凹槽之深度與寬度隨著 /、延伸方向週期變化；及採用該模仁成型稜鏡片。 :種稜鏡片’其由一透明本體構成’該透明本體表面 I複數長條狀凸起，至少—長條狀凸起之高度盘寬度 隨著其延伸方向週期變化。 、又 相較於習知技術，上述稜鏡片之透明本體表面具有複 200927470 數長條狀凸起’至少一長條狀凸起之高度與寬度隨著其延 .伸方向週期變化。故複數長條狀凸起不易形成與液晶面板 .圖元之陣列排佈相重疊之情況，從而避免疊紋干涉之產 生。且，因為採用該棱鏡片之液晶顯示裝置具有可避免疊 紋干涉之優點，無需設置防止疊紋干涉產生之上擴散片， 從而避免设置上擴散片而產生之光損失，故，採用該稜鏡 片之液晶顯示裝置具有亮度高之優點。 【實施方式】 ❹ 下面將結合附圖及複數實施例對本發明稜鏡片及其 製造方法做進一步詳細說明。 明參見圖3 ’所示為採用本發明較佳實施例一之稜鏡 片20之液晶顯示裝置2〇〇。該液晶顯示裝置2〇〇包括一框 架21與设置於該框架21内部之複數光源22、依次設置於 光源22上方並蓋住框架21之一擴散板23、一稜鏡片 及一液晶面板25。 〇 、請再一併參見圖4與圖5,稜鏡片20由一透明本體構 成，該透明本體包括第一表面2〇1及與第一表面2〇1相對 之第一表面203。第一表面2〇1面向擴散板23，第二表面 2〇3面向液晶面板25。第二表面203具有複數長條狀凸起 205 ’且每個長條狀凸起2〇5之高度h與寬度w沿長條狀 凸起2〇5之延伸方向（X方向）變化。本實施例中，長條狀 凸起205之延伸方向（即χ方向）與棱鏡片2〇之其中一側邊 平行’可以理解，長條狀凸起2〇5之 棱 片20之其中—側邊成一定角度。 ，、稷鏡 200927470 複數長條狀凸起205之延伸方向相同，每― .起2〇5沿垂直於其延伸方向之截面可為v型或梯形:本實 ，施例中優選為V型，相鄰長條狀凸起2〇5之令心間距p可 為0.025毫米至χ毫米，且截面之頂角μ 85度至％度。 棱鏡片20之厚度τ可為〇.4毫米至4毫米。棱鏡片 之材料可為聚Τ基丙烯酸甲酯、聚碳酸酯、聚苯乙烯、 苯乙烯-甲基丙烯酸甲酯共聚物中之一種或一種以上。 ❹ 框架21可由具有高反射率之金屬或塑膠製成，或塗 佈有高反射率塗層之金屬或塑膠製成。 工作時，光源22發出之光線直接進入或藉由框架21 之反射作用進入擴散板23，於擴散板23之作用下，光線 發生均勻擴散然後進入稜鏡片2〇。當光線射至稜鏡片2〇 之第二表面203上之複數長條狀凸起2〇5時，長條狀凸起 205可使光線靠近垂直於稜鏡片2〇之方向聚集並從第二表 面203出射，從而提高液晶顯示裝置2〇〇之靠近垂直於稜 ❹鏡片20之方向之區域之顯示亮度。由於長條狀凸起2仍 之高度Η與寬度W沿長條狀凸起2〇5之延伸方向變化， 其具有變化表面結構，不存在複數長條狀凸起之排佈與液 晶面板圖元之陣列排佈相重疊之情況，從而避免疊紋干涉 之產生。且，因為採用該稜鏡片2〇之液晶顯示裝置2〇〇 具有可避免疊紋干涉之優點，無需設置防止疊紋干涉產生 之上擴散片’從而避免設置上擴散片而產生之光損失，故， 採用該稜鏡片20之液晶顯示裝置2〇〇具有亮度高之優點。 可以理解，第二表面2〇3亦可用於面向擴散板23，而 200927470 使第一表面201背向擴散板23。 . 請參見圖6，所示為本發明較佳實施例二之稜鏡片 30。稜鏡片30與實施例一之稜鏡片20相似，稜鏡片30 第二表面具有複數長條狀凸起305，其不同在於：每一長 條狀凸起305沿垂直於其延伸方向之截面呈梯形，梯形兩 腰之夾角可優選85度至95度。 一種製造稜鏡片20之方法，其包括以下步驟： 提供圖7所示旋轉切削裝置33，旋轉切削裝置33可 ®旋轉切削模仁35之成型面351。旋轉切削裝置33包括一 可沿Z軸旋轉之刀刃331及與刀刃331相對之位移控制單 元333。過刀刃331之中心截面之輪廓為三角形，三角形 頂角為85度至95度。位移控制單元333包括一凸輪3331 與設置於凸輪3331上之工作台3333，該工作台3333用以 承載模仁35。該工作台3333垂直於Z軸，藉由凸輪3331 之轉動使模仁35至刀刃331之相對位移週期變化，以製造 ❹出圖8與圖9所示之模仁35。 刀刃331切削模仁成型面351以形成複數延伸方向相 同之長條狀凹槽3511，相鄰長條狀凹槽3511之間距為 0.025毫米至1毫米。於刀刃331切削模仁成型面351形 成其中任意一長條狀凹槽3511之過程中，刀刃331沿某一 方向Μ運動，同時，凸輪3331轉動使工作台3333至刀刃 331之相對位移週期變化，進而使模仁35至刀刃331之相 對位移週期變化，具體為：當凸輪Α點頂持工作台3333 時，工作台3333與刀刃331之間之相對位移最短，這樣， 200927470 刀刀331插入模仁35較深，而刀刃331中心截面之輪廓為 -二角形且刀刀331不停地作旋轉運動’對應形成之凹槽 -3511亦較深，且凹槽3511開口較寬；當凸輪b點頂持工 乍σ 3333盼，工作台3333與刀刀331之間之相對位移最 長這樣，刀刃331插入模仁35較淺.，而刀刀331中心戴 面之輪廓為三角形且刀刀331不停地作旋轉運動，對應形 成之凹槽3511亦較淺，且凹槽3511開口較窄。凸輪3331 ❹連續地轉動，使工作台3333與刀刀331之間之相對位移不 斷地由長至短與由短至長之週期變化，對應形成之凹槽 35=亦由深變淺及由淺變深之週期變化，且開口對應亦發 生寬與窄之週期變化。 然後，以該模仁35之成型面351作為射出成型模具 成型腔之一側璧，向射出成型模具之成型腔内注入並充滿 熔融之透明樹脂材料，冷卻形成稜鏡片2〇。該透明樹脂材 料可為聚曱基丙烯酸曱酯、聚碳酸酯、聚苯 ❹甲基丙晞酸甲醋共聚物中之一種或一種以上。烯本叫 製作該模仁35時，只需於普通旋轉切削裝置上增加 一位移控制單元333即可，無需要對設備進行特別設計。 故’該方法操作簡單，成本低。 另，傳統之稜鏡片係採用於透明板上塗覆樹脂膜成型 微、構之方法__人成型，二者相比，本發明之稜鏡片 内不存在光線介面損失，具有更高之光線利用率；且本發 明之稜鏡片20可以一次性製造而成，更易實現快速量產及 降低成本。此外，傳統方法於透明板上塗覆樹脂膜成型微 11 200927470 結構’由於樹脂膜形成於透明基板，兩者之厚度較薄，棱 -鏡片強度較低’容易翹曲變形’而本發明採用射出成型方 式與棱鏡片20 —體成型之長條狀凸起2〇5，長條狀凸起2〇5 與稜鏡片本體為整體結構，且厚度相對較厚，具有較高之 結構強度’可避免或減少於使用中出現翹曲變形之危險。 可以理解，刀刃頂端於垂直於刀刀㈣方向之投二輪 廓還可為弧形或梯形。與之相應’對應形成之稜鏡片中， ❹沿垂直於凸起延伸方向之截面為弧形或梯形。當刀刃頂端 於垂直於刀刀軸線方向之投影輪廓為梯形時，梯形兩腰之 夾角可為85度至95度。 可以理解，位移控制單元333還可更換為其他形式。 例如，如圖10所示，位移控制單元433包括一壓電材料模 組4331、一激發該壓電材料模組4331之訊號產生模組4332 與一設置於該壓電材料模組4331上之工作台43幻。壓電 材料模組4331支撐工作台4333,訊號產生模組4332產生 ©訊號激發壓電材料模組4331，以使壓電材料模纟4 積發生變化，從而使工作台郷至刀刀之相對;移 == 化。當產生訊號為週期訊號時，工作台4333至刀刃之相對 位移週期麦化，進而使模仁至刀刃之相對位移週期變化。 可以理解，訊號產生模組4332產生之訊號亦可為非週期訊 號，這樣，對應模仁上之長條狀凹槽之深度與寬度隨著其 延伸方為非週期變化，採用該模具成型稜鏡片之長條狀凸 起之南度與寬度隨著其延伸方向亦為非週期變化。 可以理解，模仁上之複數長條狀凹槽亦可為部份或僅 12 200927470 其中-條長條狀凹槽之深度與寬度隨著其延伸方變化。 •、可以理解，成型稜鏡片20之方式除可為射出成型外， •還可為熱壓成型等方式。熱壓成型之具體方式為··提供— 透明樹脂基板，將上述模仁35加熱，然後模仁35之成型 面331壓於透明樹脂基板上，即可形成上述棱鏡片。 綜上所述，本發明符合發明糊要件，爰依法提出專 利申叫准以上所述者僅為本發明之較佳實施方式，本 ❿發明之|巳圍並不以上述實施方式為限，舉凡熟悉本案技藝 之人士，於援依本案發明精神所作之等效修飾或變化，皆 應包含於以下之申請專利範圍内。 【圖式簡單說明】 圖1係一種採用習知之稜鏡片之液晶顯示裝置剖面示 意圖。 圖2係圖1所示液晶顯示裝置之稜鏡片之立體圖。 圖3係採用本發明較佳實施例一之稜鏡片之液晶顯示 ❹裝置剖面示意圖。 圖4係圖3所示液晶顯示装置之稜鏡片之立體圖。 圖5係圖4所示稜鏡片沿v_v線之剖面示意圖。 圖6係本發明較佳實施例二之棱鏡片之立體圖。 圖7係製造成型稜鏡片所用模仁之旋轉切削裝置較佳 實施例一之示意圖。 圖8係採用圖7所示旋轉切削裝置製造出之模仁示意 圖。 圖9係圖8所示之模仁沿Ιχ_ιχ線之剖面。 13 200927470 圖ίο係製造成型稜鏡片所用模仁之旋轉切削裝置較 佳實施例二之示意圖。 【主要元件符號說明】200927470 IX. DESCRIPTION OF THE INVENTION: TECHNICAL FIELD The present invention relates to a cymbal sheet and a method of manufacturing the same. [Prior Art] Referring to Fig. 1, a liquid crystal display device 100 using a conventional prism sheet is shown. The liquid crystal display device 100 includes a frame 11 and a plurality of light sources 12 disposed inside the frame 11, a diffusion plate 13 disposed above the light source 12 and covering the frame 11, a die 10, and a liquid crystal panel 15. The diffusing plate 13 generally contains scattering particles for diffusing light. As shown in FIG. 2, the prism sheet 10 includes a transparent substrate 101 and a lens layer 103 formed on the transparent substrate 101. The lens layer 103 has a plurality of elongated V-shaped projections 105 thereon. Each of the elongated protrusions 105 extends from one side of the gusset to the other side, and the plurality of elongated protrusions 105 are successively arranged side by side. The lens layer 103 is generally formed by applying an ultraviolet curable resin to the transparent substrate 101 and curing it by light. In use, after the light generated by the complex light source 12 is uniformly diffused into the diffusing plate 13, it continues to enter the prism sheet 10, and the emitted light is concentrated to a certain extent under the action of the elongated protrusion 105 of the cymbal 10, thereby The brightness of the liquid crystal display device 100 over a specific viewing angle range is increased. However, since the plurality of elongated protrusions 105 are continuously arranged side by side, in use, the continuous side-by-side arrangement of the plurality of elongated protrusions 105 easily overlaps with the arrangement of the liquid crystal panel 15 to make the liquid crystal display device 100 prone to occur. Moir0 Patterns affect the display effect of the liquid crystal display device 100. 200927470 In order to avoid the occurrence of moiré interference, an upper diffusion sheet 14 is usually disposed between the cymbal 〇- and the liquid crystal panel 15. The upper diffusion sheet i4 also has the function of diffusing light, and the light is further scattered by the upper diffusion sheet 14 to prevent the occurrence of the moiré interference phenomenon when the liquid crystal display device 100 is displayed. However, when the light is transmitted in the upper diffusion sheet 14, part of the light is absorbed by the upper diffusion = 14, and a part of the light is lost; and the use of the upper diffusion sheet 14 also increases the number of interfaces of the light during the transmission, thereby increasing the light. The interface of the transfer wheel is lost, so the use of the upper diffuser 14 reduces the utilization of light, so that the display brightness of the device is reduced. SUMMARY OF THE INVENTION It is necessary to provide a cymbal sheet having a high degree of twist and avoiding moiré interference and a method of manufacturing the same. A method for manufacturing a cymbal sheet, comprising: providing a rotary cutting die a rotary cutting device for forming a surface, the rotary cutting device comprising an axially, rotatable cutter and a displacement control unit opposite to the cutting edge, the displacement control is used to control the relative displacement of the mold to the blade; The cutter cuts the molding surface of the mold to form a plurality of elongated grooves, and in the process of forming at least one elongated groove therein, the displacement control unit changes the relative displacement of the mold to the knife, so that the at least— The depth and width of the long groove change periodically with the direction of the extension direction; and the die is formed by the mold. The seed piece 'consisting of a transparent body' has a plurality of elongated protrusions on the surface of the transparent body At least, the height of the height of the elongated protrusion varies periodically with the direction of its extension. Moreover, compared with the prior art, the transparent body surface of the above-mentioned cymbal has a length of 200927470. The height and width of at least one elongated protrusion are periodically changed with the extension direction of the elongated protrusion. Therefore, the plurality of elongated protrusions are not easily formed to overlap with the array arrangement of the liquid crystal panel and the element, thereby The occurrence of moiré interference is avoided. Moreover, since the liquid crystal display device using the prism sheet has the advantage of avoiding the moiré interference, it is not necessary to prevent the occurrence of the moiré interference to generate the upper diffusion sheet, thereby avoiding the light loss caused by the provision of the upper diffusion sheet. Therefore, the liquid crystal display device using the cymbal has the advantage of high brightness. [Embodiment] The cymbal sheet and the manufacturing method thereof will be further described in detail below with reference to the accompanying drawings and the embodiments. The liquid crystal display device 2 of the first embodiment of the present invention is shown in Fig. 1. The liquid crystal display device 2 includes a frame 21 and a plurality of light sources 22 disposed inside the frame 21, and is sequentially disposed on the light source 22 Upper and cover one of the diffuser plate 23 of the frame 21, a die and a liquid crystal panel 25. 〇, please refer to FIG. 4 and FIG. 5 together, the cymbal 20 is formed by a transparent body. The transparent body comprises a first surface 2〇1 and a first surface 203 opposite to the first surface 2〇1. The first surface 2〇1 faces the diffusion plate 23, and the second surface 2〇3 faces the liquid crystal panel 25. The two surfaces 203 have a plurality of elongated protrusions 205' and the height h and width w of each of the elongated protrusions 2〇5 vary along the extending direction (X direction) of the elongated protrusions 2〇5. This embodiment In the middle, the extending direction of the elongated protrusions 205 (ie, the χ direction) is parallel to one of the sides of the prism sheet 2'. It can be understood that the side edges of the ribs 20 of the elongated protrusions 2〇5 are fixed. Angle, 稷 2009 200927470 The plurality of elongated protrusions 205 extend in the same direction, and the section perpendicular to the direction of extension of each 〇 5 可 can be v-shaped or trapezoidal: in this case, preferably V in the embodiment The center distance p of the adjacent elongated protrusions 2〇5 may be 0.025 mm to χ mm, and the apex angle of the section is μ 85 degrees to % degrees. The thickness τ of the prism sheet 20 may be from 4.4 mm to 4 mm. The material of the prism sheet may be one or more of polymethyl methacrylate, polycarbonate, polystyrene, and styrene-methyl methacrylate copolymer. ❹ Frame 21 can be made of metal or plastic with high reflectivity or metal or plastic coated with a high reflectivity coating. During operation, the light emitted by the light source 22 directly enters or enters the diffusing plate 23 by the reflection of the frame 21, and under the action of the diffusing plate 23, the light is uniformly diffused and then enters the cymbal 2 〇. When the light hits the plurality of elongated protrusions 2〇5 on the second surface 203 of the cymbal 2, the elongated protrusions 205 can converge the light near the direction perpendicular to the cymbal 2〇 and from the second surface. The 203 is emitted to increase the display brightness of the liquid crystal display device 2 in a region close to the direction perpendicular to the prism lens 20. Since the height Η and the width W of the elongated protrusion 2 vary along the extending direction of the long strip protrusion 2〇5, it has a varying surface structure, and there is no arrangement of a plurality of long strip-shaped protrusions and liquid crystal panel elements. The arrangement of the arrays overlaps to avoid the occurrence of moiré interference. Moreover, since the liquid crystal display device 2 using the cymbal sheet 2 has the advantage of avoiding the moiré interference, it is not necessary to prevent the occurrence of the moiré interference to generate the upper diffusion sheet ′, thereby avoiding the light loss caused by the provision of the upper diffusion sheet, The liquid crystal display device 2 using the cymbal 20 has the advantage of high brightness. It can be understood that the second surface 2〇3 can also be used to face the diffusion plate 23, and 200927470 causes the first surface 201 to face away from the diffusion plate 23. Referring to Figure 6, there is shown a die 30 of a preferred embodiment of the present invention. The crotch panel 30 is similar to the crotch panel 20 of the first embodiment. The second surface of the crotch panel 30 has a plurality of elongated protrusions 305, the difference being that each elongate projection 305 has a trapezoidal shape along a section perpendicular to its extending direction. The angle between the trapezoidal waists may preferably be 85 degrees to 95 degrees. A method of manufacturing a cymbal 20 comprising the steps of: providing a rotary cutting device 33 as shown in Fig. 7, the rotary cutting device 33 being capable of rotating the forming surface 351 of the cutting die 35. The rotary cutting device 33 includes a blade 331 rotatable along the Z axis and a displacement control unit 333 opposite the blade 331. The contour of the center section of the blade 331 is triangular, and the apex angle of the triangle is 85 to 95 degrees. The displacement control unit 333 includes a cam 3331 and a table 3333 disposed on the cam 3331 for carrying the mold core 35. The table 3333 is perpendicular to the Z axis, and the relative displacement period of the mold core 35 to the blade edge 331 is periodically changed by the rotation of the cam 3331 to manufacture the mold core 35 shown in Figs. 8 and 9. The blade 331 cuts the mold forming surface 351 to form a plurality of elongated grooves 3511 extending in the same direction, and the distance between the adjacent elongated grooves 3511 is 0.025 mm to 1 mm. In the process of cutting the mold forming surface 351 of the cutting edge 331 to form any one of the elongated grooves 3511, the cutting edge 331 moves in a certain direction, and at the same time, the rotation of the cam 3331 causes the relative displacement period of the working table 3333 to the cutting edge 331 to change. Further, the relative displacement period of the mold core 35 to the cutting edge 331 is changed. Specifically, when the cam point is held by the table 3333, the relative displacement between the table 3333 and the blade 331 is the shortest, so that the 200927470 knife 331 is inserted into the mold core. 35 is deeper, and the contour of the central section of the cutting edge 331 is -two-sided and the knife 331 is continuously rotated. The corresponding groove -3511 is also deep, and the opening of the groove 3511 is wider; when the cam b is topped It is expected that the relative displacement between the table 3333 and the blade 331 is the longest, the blade 331 is inserted into the die 35 to be shallow, and the contour of the center of the blade 331 is triangular and the blade 331 is continuously For the rotary motion, the corresponding groove 3511 is also shallow, and the opening of the groove 3511 is narrow. The cam 3331 is continuously rotated, so that the relative displacement between the table 3333 and the blade 331 is continuously changed from long to short and from short to long, and the corresponding groove 35 is also shallower and shallower. The period of the deepening changes, and the opening corresponding to the wide and narrow period changes. Then, the molding surface 351 of the mold core 35 is used as one side of the molding cavity of the injection molding die, and is injected into the molding cavity of the injection molding die and filled with the molten transparent resin material, and cooled to form the crepe sheet 2 〇. The transparent resin material may be one or more selected from the group consisting of polydecyl methacrylate, polycarbonate, and polybenzoquinone methyl phthalate copolymer. When the mold core 35 is produced, it is only necessary to add a displacement control unit 333 to the ordinary rotary cutting device, and there is no need to specially design the device. Therefore, the method is simple in operation and low in cost. In addition, the conventional ruthenium film is formed by coating a resin film on a transparent plate to form a micro-structure, and the method is __human molding. Compared with the two, there is no light interface loss in the enamel film of the invention, and the light utilization rate is higher. Moreover, the cymbal sheet 20 of the present invention can be manufactured in one time, which is easier to achieve rapid mass production and lower cost. In addition, the conventional method is applied to a transparent plate to form a resin film to form a micro 11 200927470 structure. Since the resin film is formed on a transparent substrate, the thickness of the two is relatively thin, and the edge-lens strength is low 'easy to warp deformation' and the present invention adopts injection molding. The strip-shaped protrusion 2〇5 is formed in a manner similar to the prism sheet 20, and the elongated protrusion 2〇5 is integral with the body of the cymbal body, and has a relatively thick thickness and a high structural strength 'avoidable or Reduce the risk of warpage during use. It can be understood that the tip of the blade in the direction perpendicular to the direction of the blade (four) can also be curved or trapezoidal. Corresponding to the correspondingly formed crotch, the cross section perpendicular to the direction in which the protrusion extends is curved or trapezoidal. When the projection tip of the blade is trapezoidal in a direction perpendicular to the axis of the blade, the angle between the trapezoidal waists may be 85 to 95 degrees. It can be understood that the displacement control unit 333 can also be replaced with other forms. For example, as shown in FIG. 10, the displacement control unit 433 includes a piezoelectric material module 4331, a signal generating module 4332 for exciting the piezoelectric material module 4331, and a work disposed on the piezoelectric material module 4331. Taiwan 43 magic. The piezoelectric material module 4331 supports the worktable 4333, and the signal generating module 4332 generates an © signal excitation piezoelectric material module 4331, so that the piezoelectric material module 4 is changed, so that the table is opposite to the knife; Move ==. When the signal is generated as a periodic signal, the relative displacement period of the table 4333 to the blade is wheatted, thereby changing the relative displacement period of the mold to the blade. It can be understood that the signal generated by the signal generating module 4332 can also be a non-periodic signal, so that the depth and width of the long strip-shaped groove on the corresponding mold are non-periodically changed according to the extension thereof, and the mold is used to form the cymbal. The southness and width of the long strip-shaped protrusions also change aperiodically with the direction in which they extend. It can be understood that the plurality of elongated grooves on the mold core may also be partial or only 12 200927470 wherein the depth and width of the long strip-shaped grooves vary with the extension thereof. • It can be understood that the method of forming the cymbal sheet 20 can be, for example, injection molding, and the like. The specific method of the hot press forming is to provide a transparent resin substrate, and the above-mentioned prism sheet is formed by heating the above-mentioned mold core 35 and then pressing the molding surface 331 of the mold core 35 against the transparent resin substrate. In summary, the present invention is in accordance with the requirements of the invention, and the patent application is based on the above. The above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above embodiment. Equivalent modifications or variations made by the person skilled in the art in the present invention should be included in the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a cross-sectional view showing a liquid crystal display device using a conventional cymbal. 2 is a perspective view of a cymbal of the liquid crystal display device shown in FIG. 1. Fig. 3 is a cross-sectional view showing a liquid crystal display device of a cymbal according to a preferred embodiment of the present invention. 4 is a perspective view of a cymbal of the liquid crystal display device shown in FIG. 3. Figure 5 is a schematic cross-sectional view of the cymbal of Figure 4 taken along line v_v. Figure 6 is a perspective view of a prism sheet of a preferred embodiment 2 of the present invention. Fig. 7 is a schematic view showing a preferred embodiment 1 of a rotary cutting device for manufacturing a mold for forming a sheet. Fig. 8 is a schematic view of a mold core manufactured by using the rotary cutting device shown in Fig. 7. Figure 9 is a cross-section of the mold core shown in Figure 8 along the Ιχ χ χ line. 13 200927470 Fig. 1 is a schematic view of a second embodiment of a rotary cutting device for manufacturing a mold for forming a cymbal. [Main component symbol description]
背光模組 200 稜鏡片 20、30 第一表面 201 第二表面 203 微凹槽 204 、 305 框架 21 光源 22 擴散板 23 液晶面板 25 旋轉切削裝置 33 刀刃 331 位移控制單元 333 、 433 凸輪 3331 壓電材料模組 4331 訊號產生模組 4332 工作台 3333 、 4333 模仁 35 成型面 351 長條狀凹槽 3511 14Backlight module 200 cymbal 20, 30 first surface 201 second surface 203 micro groove 204, 305 frame 21 light source 22 diffusion plate 23 liquid crystal panel 25 rotary cutting device 33 blade 331 displacement control unit 333, 433 cam 3331 piezoelectric material Module 4331 Signal Generation Module 4332 Table 3333, 4333 Mold 35 Molding Surface 351 Strip Groove 3511 14