TWI611226B - Light guide plate, back light module and processing method of light microstructure - Google Patents
Light guide plate, back light module and processing method of light microstructure Download PDFInfo
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Abstract
本發明提供一種導光板、背光模組與光學微結構加工方法，其係揭露於導光板佈設有具有接續複數弧形凹陷部之光學微結構，前述光學微結構之剖面並呈複數弧形線段接續狀，且相鄰之弧形凹陷部之最大深度係不相等，藉此使光學微結構具有一長軸。透過前述光學微結構，即可使入射至導光板之光線沿長軸方向行進，達到填補導光板暗區之功效，提升整體出光均勻度。此外，前述之光學微結構係可透過雷射加工，以因應大尺寸導光板之需求，進而提供具高良率之導光板。 The invention provides a light guide plate, a backlight module and an optical microstructure processing method, which is disclosed that the light guide plate is provided with an optical microstructure having a plurality of continuous arc-shaped recesses, the cross section of the foregoing optical microstructure is connected by a plurality of arc-shaped line segments The maximum depth of adjacent arc-shaped depressions is not equal, so that the optical microstructure has a long axis. Through the aforementioned optical micro-structure, the light incident on the light guide plate can travel along the long axis direction to achieve the effect of filling the dark area of the light guide plate and improve the overall light uniformity. In addition, the aforementioned optical microstructures can be processed by laser to meet the needs of large-size light guide plates, thereby providing light guide plates with high yields.
Description
本發明係與光學元件領域相關，尤其是一種導光板、背光模組與光學微結構加工方法。 The invention relates to the field of optical components, in particular to a light guide plate, a backlight module and an optical microstructure processing method.
鑒於導光板之優異光學特性，近年來大量作為顯示器中背光模組主要導光元件使用，以使入射光線形成均勻面光源而提供予面板。 In view of the excellent optical characteristics of the light guide plate, in recent years, it has been widely used as the main light guide element of the backlight module in the display, so that the incident light forms a uniform surface light source and is provided to the panel.
為破壞光線入射至導光板產生的全反射現象，導光板上會設計微結構來調整出光均勻度或改變光線路徑等。微結構除了用以使光線於導光板形成面光源出光外，由於現今之背光模組已多採用發光二極體(下稱LED)作為光線來源，因LED的出光角度有所限制，是以導光板會受LED影響而產生亮暗分布現象，於此亦可透過微結構設計來改善亮暗分布狀態。 In order to destroy the total reflection phenomenon caused by light incident on the light guide plate, microstructures will be designed on the light guide plate to adjust the light uniformity or change the light path. In addition to the use of microstructures to enable light to form a surface light source on the light guide plate, since today's backlight modules have mostly used light-emitting diodes (hereinafter referred to as LEDs) as the light source, due to the limited light-emitting angle of the LED, the light guide The light board will be affected by the LED to produce the light and dark distribution phenomenon. Here, the light and dark distribution state can also be improved through the microstructure design.
針對具有較複雜與特殊微結構之導光板，基於技術發展現況，該種導光板目前僅能透過射出成型而於其上形成微結構，或是透過刀具直接針對導光板或供以射出成型導光板之模仁進行加工，逐一刻畫形成各微結構。然而，刀具雕刻極易於加工過程中產生斷刀情況，一但發生斷刀，除了會於導光板施作面產生瑕疵，換刀後的重新定位加工程序亦屬不易，該些狀況皆會大幅影響整體微結構佈設之精準度以及態樣，相對產出之導光板即無法驅使光線依循預期狀態進行出光。 For light guide plates with more complex and special microstructures, based on the current development of technology, this type of light guide plate can only form microstructures on it through injection molding, or directly target the light guide plate or provide injection molding light guide plate through a cutter The mold core is processed to form each microstructure one by one. However, the tool carving is very easy to cause the tool to break during the machining process. Once the tool breaks, in addition to the defects on the light guide plate application surface, the repositioning process after the tool change is also not easy, these conditions will be significant Affecting the precision and appearance of the overall microstructure layout, the relative light guide plate cannot drive the light to emit light according to the expected state.
另一方面，因應使用需求，目前的顯示器漸朝向大尺寸發 展，亦即搭配使用之導光板尺寸隨之增大。前述之射出成型與刀具雕刻僅適用於製成小尺寸導光板，其緣由在於當導光板尺寸變大，其上佈設之微結構數量亦隨之增加，倘若以射出方式製成大尺寸導光板，對應之模仁體積將會大幅提升，於生產上根本不可能實行。而若使用刀具直接於導光板刻劃微結構之方式，除了因微結構數量而增加施作時間外，相較於小尺寸導光板，斷刀的加工情況更容易發生，對於斷刀後重新施作的復歸精準度影響亦無可避免。 On the other hand, in response to usage demands, current monitors are gradually moving towards larger sizes Exhibition, that is, the size of the light guide plate used in conjunction with it has increased. The aforementioned injection molding and cutter carving are only suitable for making small-size light guide plates. The reason is that when the size of the light guide plate becomes larger, the number of microstructures laid on it also increases. If a large-size light guide plate is made by injection, The corresponding mold core volume will be greatly increased, and it is impossible to implement in production. If the tool is used to directly scratch the microstructure on the light guide plate, in addition to the increase in the application time due to the number of microstructures, compared with the small size light guide plate, the processing of broken knife is more likely to occur. The impact of the accuracy of the reset is unavoidable.
是以，為因應市場需求，並提升具複雜微結構之大尺寸導光板產出品質與速度，本發明人係提出一種導光板、背光模組與光學微結構加工方法，希冀有效改善並符合當前市場需求。 Therefore, in order to meet the market demand and improve the output quality and speed of large-size light guide plates with complex microstructures, the present inventors propose a light guide plate, backlight module and optical microstructure processing method, hoping to effectively improve and meet the current Market demand.
本發明之一目的，旨在提供一種導光板、背光模組與光學微結構加工方法，其係透過控制光徑進而有效提升導光板之出光均勻度，並消除熱點現象以及進一步均勻化導光板各區域的出光強度。 An object of the present invention is to provide a light guide plate, a backlight module and an optical microstructure processing method, which can effectively improve the light uniformity of the light guide plate by controlling the light path, eliminate hot spots and further uniformize the light guide plate The light intensity of the area.
為達上述目的，本發明於一實施方式中，揭示一種導光板，包括：一入光面，供以接收一光源之光線；一出光面，垂直鄰接該入光面；一底面，相對該出光面設置且與該入光面垂直鄰接；及複數個光學微結構，形成於該出光面或該底面，任一該些光學微結構具有複數弧形凹陷部且剖面呈複數弧形線段接續狀，相鄰之該等弧形凹陷部之最大深度係不相等，各該弧形凹陷部並接續排列設置使該光學微結構具有一長軸，用以導引光線沿該長軸方向行進。藉此，透過具有複數弧形凹陷部之光學微結構，即可使由入光面進入導光板內的光線依循長軸方向行進，而可將其導引至所 需補亮區域，或是提升入射光線展角，使導光板具有極佳出光均勻度。 In order to achieve the above object, the present invention in one embodiment discloses a light guide plate, which includes: a light incident surface for receiving light from a light source; a light exit surface vertically adjacent to the light entrance surface; and a bottom surface opposite to the light exit The surface is provided and vertically adjacent to the light incident surface; and a plurality of optical microstructures are formed on the light exit surface or the bottom surface, any of the optical microstructures have a plurality of arc-shaped depressions and the cross-section is a plurality of arc-shaped line segments continuous, The maximum depths of the adjacent arc-shaped depressions are not equal, and the arc-shaped depressions are arranged in succession so that the optical microstructure has a long axis for guiding light to travel along the long axis. In this way, through the optical microstructure with a plurality of arc-shaped recesses, the light entering the light guide plate from the light entrance surface can travel along the long axis direction, and can be guided to all Need to fill up the area, or increase the incident angle of incident light, so that the light guide plate has excellent light uniformity.
基於前述實施方式，於再一實施方式中，係揭示任兩相鄰之該些弧形凹陷部的圓心與該出光面的距離相等，藉此係可使光學微結構具較佳之光線導引效能以及提升加工成型之施作便利性。 Based on the foregoing embodiments, in yet another embodiment, it is disclosed that the center of any two adjacent arc-shaped recesses is equal to the distance from the light exit surface, thereby allowing the optical microstructure to have better light guiding performance And enhance the convenience of processing and forming.
於次一實施方式中，則揭露該等弧形凹陷部之排列使該光學微結構俯視呈十字狀，使光線接觸光學微結構後，即可沿十字之長軸方向行進，並部分光線接觸短軸向之弧形凹陷部時可因應光學原理同樣朝向長軸行進。 In the next embodiment, it is disclosed that the arrangement of the arc-shaped depressions makes the optical microstructure cross-shaped when viewed from the top, so that when the light contacts the optical microstructure, it can travel along the long axis of the cross, and part of the light contact is short The arc-shaped concave portion in the axial direction can also travel toward the long axis in accordance with the optical principle.
除了十字狀，於一實施方式中，係揭示該等弧形凹陷部之排列使該光學微結構俯視呈三角狀，同於前述，亦可使光線因應光學原理而朝向長軸前進。 In addition to the cross shape, in one embodiment, it is disclosed that the arrangement of the arc-shaped recesses makes the optical microstructure triangular in plan view. As described above, the light can also be advanced toward the long axis according to the optical principle.
此外，前述各實施方式所揭露之導光板，其搭配LED燈條應用時即可做為背光模組使用，於一實施方式中，本發明即揭示一種背光模組，其包括如前述之各實施態樣之導光板及一LED燈條，設置於該入光面，並界定該出光面具有一近光區域；其中，該些光學微結構，係排列於該近光區域內，以導引光線行進方向，進而填補該近光區域之暗帶，達到均勻出光功效。亦即，透過導光板之光學微結構，即可有效導引光線前往暗帶區域，以提升導光板之出光均勻度。 In addition, the light guide plate disclosed in the foregoing embodiments can be used as a backlight module when it is used in conjunction with an LED light bar. In one embodiment, the present invention discloses a backlight module including the above-mentioned implementations A light guide plate and an LED light bar are arranged on the light incident surface and define a low beam area of the light exit mask; wherein, the optical microstructures are arranged in the low beam area to guide light The direction of travel further fills the dark band of the low-beam area to achieve uniform light output. That is, through the optical microstructure of the light guide plate, the light can be effectively guided to the dark band area, so as to improve the light uniformity of the light guide plate.
其中，於一實施方式中，揭示該些光學微結構係於該近光區域內排列成一鋸齒狀條紋，且該鋸齒狀條紋之延伸方向平行該LED燈條，藉此可使光線沿各光學微結構之長軸行進，進而提升LED燈條上，各LED相對入光面之入射展角，達到展光功效。 In one embodiment, it is disclosed that the optical microstructures are arranged in a zigzag stripe in the low beam area, and the extending direction of the zigzag stripe is parallel to the LED light bar, thereby allowing light to travel along each optical microstructure The long axis of the structure travels to further increase the incident angle of incidence of each LED on the light incident surface of the LED light bar to achieve the effect of light expansion.
進一步地，於一實施方式中，本發明則揭示一種光學微結構之加工方法，包括以下步驟：提供一基材，該基材具有一加工面；利用具有一第一功率的雷射光束轟擊該加工面而形成一第一凹穴；及利用具有一第二功率的雷射光束轟擊該加工面而形成一第二凹穴，且該第二凹穴與該第一凹穴相交而組成一光學微結構；其中，該光學微結構至少具有該第一凹穴提供之一第一弧形凹陷部及該第二凹穴提供之一第二弧形凹陷部，該第一弧形凹陷部及該第二弧形凹陷部係接續排列設置，使該光學微結構剖面由至少兩弧形線段接續形成並具有一長軸，且相鄰之該第一弧形凹陷部與該第二弧形凹陷部之最大深度係不相等。透過以不同功率之雷射光束轟擊加工面，即可快速於加工面形成至少具有第一弧形凹陷部及該第二弧形凹陷部之光學微結構，並且透過雷射加工方式，係可大幅提升光學微結構的成形精準度與良率，尤當欲生產大尺寸的導光板時，利用前述方式更可有效減縮加工時間。 Further, in one embodiment, the present invention discloses an optical microstructure processing method including the following steps: providing a substrate with a processing surface; bombarding the substrate with a laser beam having a first power Processing the surface to form a first cavity; and using a laser beam with a second power to bombard the processing surface to form a second cavity, and the second cavity intersects the first cavity to form an optical Microstructure; wherein, the optical microstructure has at least a first arc-shaped depression provided by the first cavity and a second arc-shaped depression provided by the second cavity, the first arc-shaped depression and the The second arc-shaped depressions are arranged in succession, so that the optical microstructure cross-section is formed by at least two arc-shaped line segments and has a long axis, and the adjacent first arc-shaped depressions and the second arc-shaped depressions are adjacent The maximum depth is not equal. By bombarding the processing surface with laser beams of different powers, an optical microstructure having at least a first arc-shaped depression and the second arc-shaped depression can be quickly formed on the processing surface, and through laser processing, it can be substantially Improve the forming accuracy and yield of optical microstructures. Especially when you want to produce large-size light guide plates, the aforementioned method can effectively reduce processing time.
其中，於另一實施方式，更包括利用具有一第三功率的雷射光束轟擊該加工面而形成一第三凹穴，且該第三凹穴與該第一凹穴相交而組成該光學微結構，透過此加工步驟則可讓光學微結構於俯視呈十字狀或三角狀。 Wherein, in another embodiment, a laser beam with a third power is used to bombard the processed surface to form a third cavity, and the third cavity intersects the first cavity to form the optical micro Through this processing step, the optical microstructure can be cross-shaped or triangular in plan view.
此外，於再一實施方式，更包括控制具有該第二功率的雷射光束的焦點與該加工面之距離，使其等於具有該第一功率的雷射光束的焦點與該加工面之距離，透過該參數之控制調整，則可使第一弧形凹陷部及第二弧形凹陷部之圓心與加工面具有相等距離。 In addition, in still another embodiment, it further includes controlling the distance between the focal point of the laser beam with the second power and the processing surface so that it is equal to the distance between the focal point of the laser beam with the first power and the processing surface, Through the control and adjustment of this parameter, the center of the circle of the first arc-shaped recessed portion and the second arc-shaped recessed portion can be equal to the processing surface.
前述各實施方式之加工方法，除了可直接使基材即為一導光 板而透過雷射光束於其上加工光學微結構外，於次一實施方式中，更包括將該基材製作成一導光板生產模具之技術特徵，例如使基材為金屬材料，則依循前述各實施方式之步驟執行加工方法後，即可使基材形成具有光學微結構之射出成型模具，或是包覆於滾輪以針對導光板進行壓輾之金屬板。 The processing method of the foregoing embodiments, except that the substrate can be directly used as a light guide In addition to processing the optical microstructure on the board through the laser beam, in the next embodiment, it also includes the technical characteristics of making the substrate into a light guide plate production mold. For example, if the substrate is a metal material, follow the above After performing the processing method in the steps of the embodiment, the base material can be formed into an injection molding mold with optical microstructures, or a metal plate covered with a roller to be rolled against the light guide plate.
綜上所述，本發明揭示之導光板及其衍生應用之背光模組，以及光學微結構之加工方法，係可有效地導引光線透過光學微結構之長軸方向行進，提升導光板之出光均勻度，例如補強於出光面鄰近入光面區域的暗區或是減縮及消除其餘原先即存在於出光面的暗區。此外，各實施方式所提及之光學微結構，其係可透過雷射加工製成，且該加工方法係可應用於加工導光板或製成導光板生產模具之範疇，藉此製作具極佳均勻出光效能之導光板或是供以生產導光板之相關模具，且在生產方面，尤對於大尺寸導光板需求，透過前述方法更可提升製程效率與精準度。 In summary, the light guide plate and the backlight module derived therefrom, and the processing method of the optical microstructure disclosed in the present invention can effectively guide the light to travel through the long axis direction of the optical microstructure and enhance the light exit of the light guide plate Uniformity, for example, to reinforce dark areas adjacent to the light entrance surface area of the light exit surface or to reduce and eliminate the remaining dark areas that originally existed on the light exit surface. In addition, the optical microstructures mentioned in the various embodiments can be made by laser processing, and the processing method can be applied to the field of processing light guide plates or making light guide plate production molds, so as to produce excellent The light guide plate with uniform light output efficiency or related molds used to produce the light guide plate, and in terms of production, especially for the needs of large-size light guide plates, the process efficiency and accuracy can be improved by the aforementioned method.
1‧‧‧導光板 1‧‧‧Light guide plate
10‧‧‧入光面 10‧‧‧entrance
11‧‧‧出光面 11‧‧‧Glossy
111‧‧‧近光區域 111‧‧‧ Low beam area
12‧‧‧底面 12‧‧‧Bottom
13‧‧‧光學微結構 13‧‧‧Optical microstructure
131‧‧‧弧形凹陷部 131‧‧‧Curved concave part
2‧‧‧LED燈條 2‧‧‧LED light bar
20‧‧‧LED 20‧‧‧LED
3‧‧‧背光模組 3‧‧‧Backlight module
4‧‧‧基材 4‧‧‧ Base material
40‧‧‧加工面 40‧‧‧Processed surface
401‧‧‧第一凹穴 401‧‧‧The first recess
4011‧‧‧第一弧形凹陷部 4011‧‧‧The first arc-shaped depression
402‧‧‧第二凹穴 402‧‧‧Second recess
4021‧‧‧第二弧形凹陷部 4021‧‧‧Second arc-shaped depression
403‧‧‧第三凹穴 403‧‧‧The third recess
41‧‧‧光學微結構 41‧‧‧Optical microstructure
A‧‧‧長軸 A‧‧‧Long axis
B‧‧‧弧形線段 B‧‧‧ Curved line segment
C‧‧‧弧形凹陷部之圓心 C‧‧‧Center of arc-shaped depression
d1‧‧‧弧形凹陷部圓心與出光面之距離 d 1 ‧‧‧The distance between the center of the arc-shaped depression and the light exit surface
D‧‧‧鋸齒狀條紋 D‧‧‧Zigzag stripes
S1‧‧‧具第一功率的雷射光束 S 1 ‧‧‧ laser beam with first power
P1‧‧‧具第一功率雷射光束之焦點 P 1 ‧‧‧ Focus with the first power laser beam
S2‧‧‧具第二功率的雷射光束 S 2 ‧‧‧ laser beam with second power
P2‧‧‧具第二功率雷射光束之焦點 P 2 ‧‧‧ Focus with second power laser beam
d2‧‧‧具第二功率雷射光束之焦點與加工面距離 d 2 ‧‧‧ distance between the focal point of the laser beam with the second power and the processing surface
d3‧‧‧具第一功率雷射光束之焦點與加工面距離 d 3 ‧‧‧ The distance between the focal point of the laser beam with the first power and the processing surface
S01~S04‧‧‧步驟 S01 ~ S04‧‧‧Step
第1圖，為本發明一實施方式之導光板立體示意圖。 Fig. 1 is a schematic perspective view of a light guide plate according to an embodiment of the invention.
第2圖，為本發明一實施方式之光學微結構剖面示意圖。 FIG. 2 is a schematic cross-sectional view of an optical microstructure according to an embodiment of the invention.
第3圖，為本發明一實施方式之導光板平面示意圖(一)。 FIG. 3 is a schematic plan view (1) of a light guide plate according to an embodiment of the invention.
第4圖，為本發明一實施方式之導光板平面示意圖(二)。 FIG. 4 is a schematic plan view (2) of a light guide plate according to an embodiment of the present invention.
第5圖，為本發明一實施方式之光學微結構佈設示意圖(一)。 Fig. 5 is a schematic diagram (1) of optical microstructure layout according to an embodiment of the present invention.
第6圖，為本發明一實施方式之光學微結構佈設示意圖(二)。 FIG. 6 is a schematic diagram (2) of optical microstructure layout according to an embodiment of the present invention.
第7圖，為本發明一實施方式之光學微結構佈設示意圖(三)。 FIG. 7 is a schematic diagram (3) of optical microstructure layout according to an embodiment of the present invention.
第8圖，為本發明另一實施方式之步驟示意圖。 Figure 8 is a schematic diagram of steps in another embodiment of the present invention.
第9圖，為本發明另一實施方式之光學微結構剖面示意圖。 FIG. 9 is a schematic cross-sectional view of an optical microstructure according to another embodiment of the invention.
第10圖，為本發明另一實施方式之另一實施態樣步驟流程圖。 Fig. 10 is a flowchart of steps in another embodiment of another embodiment of the present invention.
第11圖，為本發明另一實施方式之另一實施態樣光學微結構示意圖。 FIG. 11 is a schematic diagram of an optical microstructure according to another embodiment of the present invention.
導光板的出光要求，視其應用之範疇而有所變化，當其作為背光模組中的光學元件時，其主要需求在於出光的均勻度呈現，亦為當前相關廠商致力改善的部分。特別在須因應各種調光需求而致使導光板上的微結構態樣漸趨複雜與特殊，同時目前市場需求亦漸朝向大尺寸發展，在前述情況下，如何生產與設計可具極佳出光均勻度之大尺寸導光板實屬不易。是以，本發明人經過多重發想與實驗，進而提出如本發明所揭露之內容，除可有效提高導光板整體出光均勻性外，亦具有極佳之生產良率與效率。請參閱第1、2及3~4圖，其係為本發明一實施方式之導光板立體示意圖、光學微結構剖面示意圖及各導光板平面示意圖。本發明揭示一種導光板1，包括一入光面10、一出光面11、一底面12及複數光學微結構13。 The light output requirements of the light guide plate vary depending on the scope of its application. When it is used as an optical component in a backlight module, its main requirement is the uniformity of the light output, which is also part of the current efforts of relevant manufacturers to improve. Especially in response to various dimming requirements, the microstructure on the light guide plate is becoming more and more complex and special. At the same time, the current market demand is also gradually developing towards large sizes. In the foregoing circumstances, how to produce and design can have excellent light uniformity The large size light guide plate is not easy. Therefore, after multiple ideas and experiments, the inventors further proposed that the content disclosed by the present invention not only can effectively improve the overall light uniformity of the light guide plate, but also has excellent production yield and efficiency. Please refer to FIGS. 1, 2, and 3 to 4, which are a three-dimensional schematic diagram of a light guide plate, a cross-sectional schematic diagram of an optical microstructure, and a schematic plan view of each light guide plate according to an embodiment of the present invention. The invention discloses a light guide plate 1 including a light incident surface 10, a light exit surface 11, a bottom surface 12 and a plurality of optical microstructures 13.
入光面10供以接收一光源(圖中未示)之光線，出光面11及底面12彼此相對設置且分別與入光面10垂直鄰接。光學微結構13形成於導光板1之出光面11或底面12，於此係以該些光學微結構13形成於出光面11為例。任一光學微結構13具有複數弧形凹陷部131且剖面呈複數弧形線段B接續狀，並相鄰之弧形凹陷部131的最大深度互不相等，同時各弧形凹陷部131並接續排列設置使光學微結構13具有一長軸A，用以導引光線沿長軸A方向行進。亦即，透過前述光學微結構13，係可有效調整入射光線的行進路徑，入光面10接收光源之光線時，部分光線受光學微結構13 作用而可沿長軸A方向行進，透過調整長軸A指向，即可讓入射光線達到填補出光面較暗區域或提高光源入光展角等功效。換言之，該些光學微結構13乃透過接續之弧形凹陷部131特徵，而使光學微結構13為具有長軸A之結構態樣，以有效地導引光線朝向所需區域行進出光。除了利用長軸A進行導光外，當光源之光線進入導光板1，原先平行入射之各光線接觸弧形凹陷部131時，平行光線受弧形凹陷部13之弧面影響而使得各光線呈發散態樣，進而達到散光之功效，亦即可提升光源入光展角，可參閱第2圖所示，惟第2圖中之光線僅供以說明示意前述弧面可散開光線特徵，非指實際之光線行進路徑。 The light incident surface 10 is used to receive light from a light source (not shown), and the light exit surface 11 and the bottom surface 12 are opposite to each other and are vertically adjacent to the light incident surface 10 respectively. The optical microstructures 13 are formed on the light exit surface 11 or the bottom surface 12 of the light guide plate 1. Here, the optical microstructures 13 are formed on the light exit surface 11 as an example. Any optical microstructure 13 has a plurality of arc-shaped depressions 131 and the cross-section is a plurality of arc-shaped line segments B continuous, and the maximum depths of adjacent arc-shaped depressions 131 are not equal to each other, and the arc-shaped depressions 131 are arranged in succession The arrangement makes the optical microstructure 13 have a long axis A for guiding light to travel along the long axis A direction. That is, through the aforementioned optical microstructure 13, the travel path of the incident light can be effectively adjusted. When the light incident surface 10 receives the light from the light source, part of the light is affected by the optical microstructure 13 It can travel along the direction of the long axis A by adjusting the direction of the long axis A, so that the incident light can fill the darker area of the light surface or increase the angle of incidence of the light source. In other words, the optical microstructures 13 are characterized by the continuous arc-shaped recesses 131, so that the optical microstructures 13 have a structure with a long axis A, so as to effectively guide the light toward and away from the desired area. In addition to using the long axis A for light guide, when the light from the light source enters the light guide plate 1, when the light rays that were originally parallel incident contact the arc-shaped concave portion 131, the parallel light is affected by the arc surface of the arc-shaped concave portion 13 so that each light Divergent appearance, and then achieve the effect of astigmatism, which can also increase the incident angle of the light source, you can refer to Figure 2, but the light in Figure 2 is only for illustrative purposes. The actual light travel path.
相鄰之該些弧型凹陷部131之圓心係可為等高或非等高，進一步搭配弧形凹陷部131之半徑參數調整，使相鄰之弧型凹陷部131具不同的深度。較佳者，於本實施方式，係使任二相鄰之弧形凹陷部131圓心C與出光面11的距離d1相等，如第2圖所示，亦即任二相鄰之弧形凹陷部131具有等高之圓心C，相異之半徑，而使相鄰之弧形凹陷部131具有不等之最大深度，藉此結構特徵而可使光線接觸弧形凹陷部131後更易達到散光與沿長軸A前進等導光效能。並於本實施方式中，係使弧形凹陷部131之最大深度與最大半徑由光學微結構13之邊側朝中央漸增，弧形線段B的最大投影長度亦由光學微結構13剖面邊側朝中央漸增。此外，該些弧形凹陷部131之排列，係可使光學微結構13由導光板1俯視呈十字狀如第3圖所示，或可為三角狀如第4圖所示，以達到更佳之光徑調整效果，且可根據應用時之出光需求提供符合的導光效能。其中，第3與第4圖所示之長軸A僅為一較佳示意說明，實作上視各弧型凹陷部131之半徑、深度等數值與排 列狀態，長軸A之位置亦可非位於圖中標示處。 The center of the circle of the adjacent arc-shaped depressions 131 can be of equal height or non-equal height, which is further matched with the radius parameter adjustment of the arc-shaped depressions 131 so that the adjacent arc-shaped depressions 131 have different depths. Preferably, in this embodiment, the distance d 1 between the center C of any two adjacent arc-shaped concave portions 131 and the light exit surface 11 is equal, as shown in FIG. 2, that is, any two adjacent arc-shaped concave portions The portion 131 has a center C of equal height and a different radius, so that the adjacent arc-shaped concave portions 131 have unequal maximum depths. With this structural feature, the light can contact the arc-shaped concave portion 131 more easily to achieve astigmatism and Advance along the long axis A and other light guiding efficiency. In this embodiment, the maximum depth and the maximum radius of the arc-shaped concave portion 131 are gradually increased from the side of the optical microstructure 13 toward the center, and the maximum projection length of the arc line segment B is also from the cross-sectional side of the optical microstructure 13 Increasing towards the center. In addition, the arrangement of the arc-shaped concave portions 131 can make the optical microstructure 13 cross-shaped from the light guide plate 1 as shown in FIG. 3, or can be triangular as shown in FIG. 4 to achieve a better The adjustment effect of the light path, and it can provide the light guide performance according to the light output requirements of the application. Among them, the long axis A shown in FIGS. 3 and 4 is only a preferred schematic illustration. In practice, depending on the values and arrangement states of the radius and depth of each arc-shaped concave portion 131, the position of the long axis A may not be Located at the marked place in the figure.
進一步地，如第5、6及7圖所示，其為本發明一實施方式之各光學微結構佈設示意圖，並請復搭配參閱第1~4圖。前述各種態樣之導光板1，搭配一LED燈條2即可做為一背光模組3使用，LED燈條2係對應入光面10設置，且界定出光面11具有一近光區域111。其中，導光板1之光學微結構13係排列於近光區域111內，以導引光線行進方向，進而填補近光區域111之暗帶或暗區，達到均勻出光功效。舉例而言，如第5圖所示，部分之光學微結構13係於近光區域111內排列成一鋸齒狀條紋D，且鋸齒狀條紋D之延伸方向平行LED燈條2。藉此，LED燈條2之光線入射至導光板1後，受該些光學微結構13調整，即可使近光區域111具有足夠之光線能量，同時亦可有效提高LED燈條2上，間隔設置之各LED20的入光展角。 Further, as shown in Figs. 5, 6 and 7, it is a schematic diagram of the layout of optical microstructures according to an embodiment of the present invention, and please refer to Figs. The light guide plate 1 of the foregoing various aspects can be used as a backlight module 3 with an LED light bar 2. The LED light bar 2 is provided corresponding to the light incident surface 10 and defines the light surface 11 having a low beam area 111. Among them, the optical microstructures 13 of the light guide plate 1 are arranged in the low beam area 111 to guide the direction of light travel, thereby filling the dark bands or dark areas of the low beam area 111 to achieve uniform light output. For example, as shown in FIG. 5, part of the optical microstructures 13 are arranged in a low-beam area 111 into a zigzag stripe D, and the extending direction of the zigzag stripe D is parallel to the LED light bar 2. In this way, after the light of the LED light bar 2 is incident on the light guide plate 1 and adjusted by the optical microstructures 13, the low-beam area 111 can have sufficient light energy, and at the same time, the spacing on the LED light bar 2 can be effectively increased. The incident angle of each LED20 is set.
或如第6圖所示，該些光學微結構13可設置於近光區域111內，並對應LED20呈輻射狀排列設置，且使出光面11鄰近相鄰LED20間之區域具有較密集的光學微結構13。由於LED燈條2上的各LED20係為間隔設置，受LED20的出光展角影響，出光面11對應相鄰LED20間的區域會形成暗區，於此，即可利用導光板1上的光學微結構13將光線導往暗區，進而消彌亮度不均的情況。除此之外，藉由前述光學微結構13，亦可使LED燈條2之光線由入光面10入射至導光板1後，各LED20的光線受光學微結構13之長軸A導引，進而增大各LED20的入光展角，相對地即可消除前述出光面11對應相鄰LED20間區域易生成之暗區。惟此僅為一種光學微結構13之佈設示意而已，並不侷限於該種設置態樣。 Or as shown in FIG. 6, the optical microstructures 13 can be disposed in the low beam area 111 and arranged in a radial arrangement corresponding to the LEDs 20, and the light emitting surface 11 adjacent to the adjacent LED 20 has a denser optical microstructure Structure 13. Since the LEDs 20 on the LED light bar 2 are arranged at intervals, the area between the light emitting surface 11 corresponding to the adjacent LEDs 20 will form a dark area due to the light spreading angle of the LED 20. Here, the optical microscopic light on the light guide plate 1 can be used The structure 13 guides the light to the dark area, thereby eliminating the uneven brightness. In addition, through the aforementioned optical microstructure 13, the light of the LED light bar 2 can also be incident on the light guide plate 1 from the light incident surface 10, and the light of each LED 20 is guided by the long axis A of the optical microstructure 13, Furthermore, by increasing the light incident angle of each LED 20, the dark area easily generated in the area between the adjacent LEDs 20 corresponding to the light exit surface 11 can be eliminated. However, this is only a schematic diagram of the layout of an optical microstructure 13 and is not limited to this configuration.
又在LED燈條2與導光板1之普遍對應設置關係下，近光區域111內鄰近導光板1邊側位置，亦常見有暗區生成，透過前述之光學微結構13，同樣可使部分入射光線受長軸A導引而行進至該處，使近光區域111具有極佳之光線均勻度。為消除前述導光板1邊側位置的暗區，該些光學微結構13較佳可為密集對應佈設於邊側暗區，如第7圖所示，藉此可導引較多光線至該處並形成出光，進而達到均勻出光功效。除了前述之各種佈設態樣，光學微結構13亦可依據與入光面10之距離呈不等疏密的佈設，例如其佈設密度可由入光面10朝相對側漸增。 In addition, under the general corresponding relationship between the LED light bar 2 and the light guide plate 1, the low beam area 111 is adjacent to the side of the light guide plate 1, and dark areas are also commonly generated. Through the aforementioned optical microstructure 13, part of the incident can also be made The light is guided by the long axis A to travel there, so that the low beam area 111 has excellent light uniformity. In order to eliminate the dark area on the side of the light guide plate 1, the optical microstructures 13 may be densely arranged in the dark area on the side, as shown in FIG. 7, thereby guiding more light to the area And form light, and then achieve uniform light output. In addition to the various layouts described above, the optical microstructures 13 can also be arranged in an unequal density according to the distance from the light incident surface 10, for example, the layout density can gradually increase from the light incident surface 10 toward the opposite side.
再請參閱第8及9圖，其係為本發明另一實施方式之步驟示意圖及光學微結構局部剖面示意圖。本發明亦揭示一種光學微結構之加工方法，包括以下步驟：首先，提供一基材4，且基材4係具有一加工面40(步驟S01)。接續利用具有一第一功率的雷射光束S1轟擊加工面40而形成一第一凹穴401(步驟S02)，如第9圖中之(a)所示。而後，利用具有一第二功率的雷射光束S2轟擊加工面40而形成一第二凹穴402，且第一凹穴401與第二凹穴402相交而組成一光學微結構41(步驟S03)，如第9圖中之(b)所示，惟圖中所示之具第一功率之雷射光束S1與具第二功率之雷射光束S2僅供以示意。詳細言，於形成第一凹穴401及第二凹穴402之過程中，係可於加工面40先以第一功率之雷射光束S1形成多個第一凹穴401，再利用第二功率的雷射光束S2於加工面形成多個分別與第一凹穴401相交之第二凹穴402。亦可在透過具第一功率之雷射光束S1轟擊加工面40形成第一凹穴401時，切換使用具第二功率之雷射光束S2而於加工面40轟擊形成與第一凹穴401相交之第二凹穴402。 Please refer to FIGS. 8 and 9 again, which are schematic diagrams of steps and partial cross-sectional diagrams of optical microstructures according to another embodiment of the present invention. The invention also discloses a method for processing optical microstructures, including the following steps: First, a substrate 4 is provided, and the substrate 4 has a processing surface 40 (step S01). Then, the laser beam S 1 having a first power is used to bombard the processing surface 40 to form a first cavity 401 (step S02), as shown in (a) of FIG. 9. Then, the laser beam S 2 with a second power is used to bombard the processing surface 40 to form a second cavity 402, and the first cavity 401 and the second cavity 402 intersect to form an optical microstructure 41 (step S03 ), As shown in (b) of Figure 9, the laser beam S 1 with the first power and the laser beam S 2 with the second power shown in the figure are for illustration only. In detail, in the process of forming the first cavity 401 and the second cavity 402, a plurality of first cavity 401 can be formed on the processing surface 40 with the laser beam S 1 of the first power first, and then the second cavity The laser beam S 2 of power forms a plurality of second recesses 402 that intersect the first recess 401 on the processing surface, respectively. Alternatively, when the first cavity 401 is bombarded by the laser beam S 1 with the first power to form the first cavity 401, the laser cavity S 2 with the second power can be switched to form the first cavity with the first cavity 401 交 之 的 cess 2 402.
其中，光學微結構41至少具有第一凹穴401提供之一第一弧形凹陷部4011，以及第二凹穴402所提供之一第二弧形凹陷部4021，第一弧形凹陷部4011及第二弧形凹陷部4021係接續排列設置，使光學微結構41剖面由至少二弧形線段接續形成並具有一長軸，且相鄰之第一弧形凹陷部4011與第二弧形凹陷部4021之最大深度係不相等。特別一提的是，前述加工方法透過使用不同功率之雷射光束轟擊加工面40，而形成由複數不等深之凹穴相交形成之特殊光學微結構，係突破雷射加工成形結構上侷限，有效地製成具極佳導光效果之特殊結構，相較於傳統的刀具雕刻，其輸出產品之速度與精準度大幅提升。 The optical microstructure 41 has at least one first arc-shaped concave portion 4011 provided by the first cavity 401, and a second arc-shaped concave portion 4021 provided by the second cavity 402, the first arc-shaped concave portion 4011 and The second arc-shaped concave portions 4021 are successively arranged, so that the cross section of the optical microstructure 41 is formed by at least two arc-shaped line segments and has a long axis, and the adjacent first arc-shaped concave portion 4011 and second arc-shaped concave portion The maximum depth of 4021 is not equal. In particular, the aforementioned processing method uses a laser beam of different power to bombard the processing surface 40 to form a special optical microstructure formed by the intersection of multiple unequal depth cavities, which is a breakthrough in the laser processing forming structure. It is effectively made into a special structure with excellent light guiding effect. Compared with traditional tool carving, the speed and accuracy of its output products are greatly improved.
此外，進一步，前述方法更可包括控制具有第二功率的雷射光束S2焦點P2與加工面40之距離d2，使其等於具有第一功率的雷射光束S1焦點P1與加工面40之距離d3，藉此以使第一弧形凹陷部4011與第二弧形凹陷部4021的圓心與加工面40的距離相等。以製作方面而言，固定異次轟擊之焦點與加工面40距離，僅需調整功率參數使成形之第一弧形凹陷部4011及第二弧形凹陷部4021具有相異之半徑形成具不等深度之結構態樣，係可較為快速且精準地進行加工。且透過前述的雷射光束控制，可使第一弧形凹陷部4011與第二弧形凹陷部4021之最大深度與最大半徑由光學微結構41之邊側朝中央漸增，其剖面形成之弧形線段的最大投影長度亦由光學微結構41剖面邊側朝中央漸增。相關結構特徵可進一步復參閱第2圖，於本實施方式中，第一弧形凹陷部4011與第二弧形凹陷部4021可分別等同於第2圖所示之弧形凹陷部131，其餘細部特徵已於前述，於此即不加以贅述。 In addition, further, the foregoing method may further include controlling the distance d 2 between the focal point P 2 of the laser beam S 2 having the second power and the processing surface 40 to be equal to the focal point P 1 of the laser beam S 1 having the first power and the processing The distance d 3 of the surface 40 is such that the center of the circle of the first arc-shaped concave portion 4011 and the second arc-shaped concave portion 4021 is equal to the distance of the processing surface 40. In terms of manufacturing, the distance between the focal point of the different bombardment and the processing surface 40 is fixed, and only the power parameters need to be adjusted so that the formed first arc-shaped recessed portion 4011 and the second arc-shaped recessed portion 4021 have different radii. The deep structure can be processed quickly and accurately. Moreover, through the aforementioned laser beam control, the maximum depth and the maximum radius of the first arc-shaped concave portion 4011 and the second arc-shaped concave portion 4021 can be gradually increased from the side of the optical microstructure 41 toward the center, and the arc formed by the cross section The maximum projection length of the shape line segment also gradually increases from the side of the cross section of the optical microstructure 41 toward the center. For related structural features, please refer to FIG. 2 for further reference. In this embodiment, the first arc-shaped concave portion 4011 and the second arc-shaped concave portion 4021 can be identical to the arc-shaped concave portion 131 shown in FIG. The features have already been described above and will not be repeated here.
請參閱第10及11圖，其係為本發明另一實施方式之另一實 施態樣步驟流程圖與光學微結構示意圖。於本實施態樣中，於透過具第一功率之雷射光束S1轟擊加工面40或透過具第二功率之雷射光束S2轟擊加工面40後，更利用具有一第三功率的雷射光束轟擊加工面40形成一第三凹穴403，且第三凹穴403與第一凹穴401相交而組成光學微結構41(S04)，於此以利用具有第二功率之雷射光束S2轟擊加工面40後，遂而再使用具有第三功率之雷射光束轟擊加工面40為例說明。藉此，加工面40成形之光學微結構41俯視態樣係可組成十字狀或三角狀，可參閱第11圖所示，圖中即以光學微結構41為十字狀為例，惟圖中之第一凹穴401、第二凹穴402及第三凹穴403僅為示意，非代表實際凹穴態樣與排列位置。此外，第三凹穴403除可與第一凹穴401相交外，其亦可與第二凹穴402成相交態樣，以排列成所需之光學微結構41形態。 Please refer to FIG. 10 and FIG. 11, which are flowcharts of steps and optical microstructure diagrams of another embodiment of another embodiment of the present invention. In this embodiment, after the laser beam S 1 having the first power is used to bombard the processing surface 40 or the laser beam S 2 having the second power is used to bombard the processing surface 40, a laser having a third power is further utilized. The laser beam bombards the processing surface 40 to form a third cavity 403, and the third cavity 403 intersects the first cavity 401 to form an optical microstructure 41 (S04), where the laser beam S with the second power is utilized 2 After bombarding the processing surface 40, a laser beam with a third power is then used to bombard the processing surface 40 as an example. In this way, the optical microstructure 41 formed on the processing surface 40 can be formed into a cross shape or a triangle shape when viewed from above. As shown in FIG. 11, the optical microstructure 41 is taken as a cross shape as an example. The first cavity 401, the second cavity 402, and the third cavity 403 are for illustration only, and do not represent actual cavity patterns and arrangement positions. In addition, the third cavity 403 can intersect with the second cavity 402 in addition to the first cavity 401, so as to be arranged into a desired optical microstructure 41.
此外，前述加工方法係可應用於將基材4製作成一導光板生產模具，例如，使基材4之材料為金屬時，透過前述方法加工後即可形成導光板之射出成型模具。或基材4為一金屬板時，於加工形成該些光學微結構41後可包覆於一滾輪，藉此壓輾導光板而於導光板之出光面或底面形成光學微結構。又或者，基材4本身即可為一導光板，此時基材4更具有一相對加工面40之底面，透過前述加工方法使光學微結構41於加工面40成形後，進入基材4之光線受光學微結構41作用而自加工面40或底面12形成出光。透過前述方法製成之導光板則請搭配復參閱第1圖，於此所述之基材40即可對應至第1圖內的導光板1，加工面40則可對應至第1圖內的出光面11，而光學微結構41則對應於第1圖之光學微結構13。簡言之，於本實施方式所揭示之加工方法，其應用範疇可為針對金屬材料之基材進 行光學微結構41加工而製成導光板生產模具，如射出成型之模仁或可包覆於滾輪以對導光板進行壓輾之金屬板，或為直接針對導光板表面進行雷射加工而形成光學微結構之製程應用。 In addition, the aforementioned processing method can be applied to make the base material 4 into a light guide plate production mold. For example, when the material of the base material 4 is metal, the injection molding mold for the light guide plate can be formed after processing through the aforementioned method. Or, when the substrate 4 is a metal plate, after the optical microstructures 41 are formed by processing, they can be wrapped around a roller to roll the light guide plate to form optical microstructures on the light emitting surface or bottom surface of the light guide plate. Alternatively, the base material 4 itself can be a light guide plate. At this time, the base material 4 further has a bottom surface opposite to the processing surface 40. After the optical microstructure 41 is formed on the processing surface 40 by the foregoing processing method, it enters the base material 4 The light is affected by the optical microstructure 41 to form light from the processing surface 40 or the bottom surface 12. For the light guide plate manufactured by the aforementioned method, please refer to FIG. 1 for reference. The substrate 40 described here can correspond to the light guide plate 1 in FIG. 1, and the processed surface 40 can correspond to the light guide plate in FIG. 1. The light exit surface 11 and the optical microstructure 41 correspond to the optical microstructure 13 in FIG. 1. In short, the processing method disclosed in this embodiment can be applied to substrates of metal materials. The optical microstructure 41 is processed to form a light guide plate production mold, such as an injection molded mold core or a metal plate that can be wrapped on a roller to roll the light guide plate, or formed by laser processing directly on the surface of the light guide plate Process application of optical microstructure.
此外，同於前述，視導光需求，於加工面40成形之光學微結構41係可鄰近基材4一側邊設置，且可為鋸齒狀線條排列、輻射狀排列或是於加工面40兩邊側區域佈設較為密集之光學微結構41等，而使後續製成之導光板於應用時，有效利用光學微結構進行導光，進而獲得預期之出光均勻度。而光學微結構41之排佈態樣則可復參閱第5、6及7圖，本實施方式所述之光學微結構41即同於第5、6及7圖中之光學微結構13。 In addition, the optical microstructures 41 formed on the processing surface 40 can be disposed adjacent to the side of the substrate 4 and can be arranged in a zigzag line, a radial arrangement, or on both sides of the processing surface 40, as described above, depending on the light guide requirements The side regions are provided with denser optical microstructures 41, etc., so that the light guide plates made in the future can effectively use the optical microstructures to guide light, thereby obtaining the desired light uniformity. For the arrangement of the optical microstructures 41, please refer to Figures 5, 6 and 7 again. The optical microstructures 41 described in this embodiment are the same as the optical microstructures 13 in Figures 5, 6 and 7.
綜上所述，本發明揭示之導光板及其衍生應用之背光模組，以及光學微結構之加工方法，係可有效地導引光線以指定方向行進，進一步使導光板可具有均勻的出光效能。例如針對LED燈條上各相鄰之LED間隔在出光面形成的暗區，或導光板近光區域邊側的暗區等，皆可透過光學微結構之長軸導光特性消除。除了補強暗區之外，利用光學微結構亦可有效提升LED燈條上各LED的入光展角，相對地達到減縮及消除原先存在於出光面的暗區，亦為一種均光之功效。而該些由弧形凹陷部構成之光學微結構，係可因應所需導光需求而呈對應LED之輻射狀排列，或是特別以對應導光板邊側區域之態樣進行佈設。本發明於各實施方式所提及之光學微結構，其係可透過雷射加工製成，且該加工方法係可應用於加工導光板或製成導光板生產模具之範疇。其運用具相異功率之雷射光束分別於基材形成凹穴，並使光學微結構具有由各凹穴提供之各弧形凹陷部，而形成具有長軸之凹陷結構，以利於光線沿其長軸行進，同時，利用不同功率的雷射 光束進行轟擊可進一步使光學微結構之俯視態樣形成十字狀或三角狀等，而可因應所需導光需求具有靈活的製程控制特性。 In summary, the light guide plate and the backlight module derived from the invention, as well as the processing method of the optical microstructure, can effectively guide the light to travel in a specified direction, so that the light guide plate can have a uniform light output efficiency . For example, the dark areas formed on the light emitting surface of the adjacent LED intervals on the LED light bar, or the dark areas on the side of the low-light area of the light guide plate can be eliminated by the long-axis light guide characteristics of the optical microstructure. In addition to reinforcing dark areas, the use of optical microstructures can also effectively increase the light incident angle of each LED on the LED light bar, relatively reducing and eliminating dark areas that originally existed on the light exit surface, and is also a kind of uniform light effect. The optical microstructures composed of arc-shaped depressions can be arranged in a radial pattern corresponding to the LED according to the required light guide requirements, or can be arranged in a manner corresponding to the side area of the light guide plate. The optical microstructures mentioned in the embodiments of the present invention can be manufactured by laser processing, and the processing method can be applied to the processing of light guide plates or the production of light guide plate production molds. It uses laser beams with different powers to form recesses in the substrate, and the optical microstructure has arc-shaped recesses provided by the recesses, and forms a recessed structure with a long axis to facilitate light along its Long axis travel, at the same time, using different power lasers The bombardment of the light beam can further make the top view of the optical microstructure form a cross shape or a triangle shape, etc., and can have flexible process control characteristics according to the required light guide requirements.
惟，以上所述者，僅為本發明之諸實施方式而已，並非用以限定本發明實施之範圍；故在不脫離本發明之精神與範圍下所作之均等變化與修飾，皆應涵蓋於本發明之專利範圍內。 However, the above are only the embodiments of the present invention and are not intended to limit the scope of the present invention; therefore, all changes and modifications made without departing from the spirit and scope of the present invention should be covered in this Within the patent scope of the invention.
1‧‧‧導光板 1‧‧‧Light guide plate
10‧‧‧入光面 10‧‧‧entrance
11‧‧‧出光面 11‧‧‧Glossy
12‧‧‧底面 12‧‧‧Bottom
13‧‧‧光學微結構 13‧‧‧Optical microstructure
131‧‧‧弧形凹陷部 131‧‧‧Curved concave part
A‧‧‧長軸 A‧‧‧Long axis
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| TW201122576A (en) * | 2009-12-25 | 2011-07-01 | Coretronic Corp | Light guide plate and backlight module |
| US20120195550A1 (en) * | 2011-01-31 | 2012-08-02 | Global Lighting Technology Inc. | Method of making optical microstructure pattern on light guide plate, light guide plate thereof and imprinting mold |
| TW201641205A (en) * | 2015-05-26 | 2016-12-01 | 茂林光電科技股份有限公司 | A method of manufacturing an optical micro-structure, the machine and the light guide plate |
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| TW201122576A (en) * | 2009-12-25 | 2011-07-01 | Coretronic Corp | Light guide plate and backlight module |
| US20120195550A1 (en) * | 2011-01-31 | 2012-08-02 | Global Lighting Technology Inc. | Method of making optical microstructure pattern on light guide plate, light guide plate thereof and imprinting mold |
| TW201641205A (en) * | 2015-05-26 | 2016-12-01 | 茂林光電科技股份有限公司 | A method of manufacturing an optical micro-structure, the machine and the light guide plate |
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