模具微结构及其加工方式对导光板性能的影响
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摘要
为研究导光板微透镜结构尺寸及其加工方式对导光板性能的影响,选取了聚甲基丙烯酸甲酯(PMMA)和聚碳酸酯(PC)两种材料的基板,在类固态等温热压印成型工艺条件下压印导光板。然后采用九宫格法分别测量其表面9个点的照度,并算出其平均照度和均匀度,以导光板的平均照度和均匀度为导光板质量的表征量。结果表明:网点直径为80和37μm的PMMA均匀度曲线交点所对应的基片厚度为0.95 mm,而PC的均匀度曲线交点所对应的基片厚度为0.80 mm;相同厚度下,PMMA导光板比PC导光板所需的网点微透镜结构直径大;越薄的导光板所需的网点微透镜结构越小;撞点法加工的微结构模具比激光烧灼模具更有利于导光板微透镜结构的成型。
In order to study the infl uence of the size and processing method of the microlens on performance of the light guide plate, the average illuminance and uniformity of the light guide plate were used to characterize the quality of the light guide plate. The substrates of polymethyl methacrylate(PMMA) and polycarbonate(PC) were selected, which were embossed under the condition of a solid-like isothermal hot stamping process. Then, the illuminance of nine points on the surface was measured by nine-square grid method, and the average illuminance and uniformity were calculated. The results show that the intersection of the uniformity curves of the 80 μm and 37 μm PMMA corresponds to a substrate thickness of 0.95 mm, and the PC uniformity curve intersection corresponds to a thickness of 0.80 mm. The diameter of dot microlens structure of PMMA light guide plate is larger than that required for the PC light guide plate of the same thickness. The thinner light guide plate requires the smaller dot microlens structure. Comparing the quality of the light guide plate imprinted by the collision point die and the laser cauterization mold, it is found that the micro structure mold processed by the collision point method is more favorable for the molding of the micro lens structure.
In order to study the infl uence of the size and processing method of the microlens on performance of the light guide plate, the average illuminance and uniformity of the light guide plate were used to characterize the quality of the light guide plate. The substrates of polymethyl methacrylate(PMMA) and polycarbonate(PC) were selected, which were embossed under the condition of a solid-like isothermal hot stamping process. Then, the illuminance of nine points on the surface was measured by nine-square grid method, and the average illuminance and uniformity were calculated. The results show that the intersection of the uniformity curves of the 80 μm and 37 μm PMMA corresponds to a substrate thickness of 0.95 mm, and the PC uniformity curve intersection corresponds to a thickness of 0.80 mm. The diameter of dot microlens structure of PMMA light guide plate is larger than that required for the PC light guide plate of the same thickness. The thinner light guide plate requires the smaller dot microlens structure. Comparing the quality of the light guide plate imprinted by the collision point die and the laser cauterization mold, it is found that the micro structure mold processed by the collision point method is more favorable for the molding of the micro lens structure.
引文
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[2]Pan J W,Fan C W.High luminance hybrid light guide plate for backlight module application[J].Optics Express,2011,19(21):20 079-20 087.
[3]舒伟.手机液晶显示器背光模组中导光板的光学设计及制程研究[D].上海:复旦大学,2011.
[4]李晓建.导光板的设计及制作方法研究[D].苏州:苏州大学,2009.
[5]Burkley A S.The effect of liquid crystal displays on reading comprehension[J].Dissertations&Theses-Gradworks,2014(4):9-13.
[6]李世保,吴大鸣,庄俭,等.一种具有波形槽微结构的导光板设计[J].液晶与显示,2011,26(4):469-473.
[7]孙靖尧,吴大鸣,刘颖,等.聚合物微纳制造技术[J].橡塑技术与装备,2016(10):1-9.
[8]杨振洲.聚合物微结构平板热压印成型工艺的研究[D].北京:北京化工大学,2015.
[9]Yang C H,Yang S Y.A high-brightness light guide plate with high precise double-sided microstructures fabricated using the fixed boundary hot embossing technique[J].Journal of Micromechanics&Microengineering,2013,DOI:10.1088/0960-1317/23/3/035033.
[10]戴乐,吴大鸣,孙靖尧,等.对类固态等温热压印过程中聚合物的填充分析[J].塑料,2018(1):84-87.
[11]He Y,Zhang T,Fu J Z,et al.Experimental study on the fabrication of the light guide plate with hot embossing method[J].Applied Mechanics&Materials,2010,37-38:448-452.
[12]李瑞,吴大鸣,王琦,等.PMMA在类固态微热压印过程中冷却速率与松弛速率的规律分析[J].中国塑料,2017,31(12):78-83.
[13]吉田弘美.模具加工技术[M].上海:上海交通大学出版社,1987.
[14]张永宁,杨钟麟,周玉兰,等.一种加工模具的激光加工中心:中国,1559754A[P].2005-01-05.
[15]李保安.导光板微结构型式的设计与模拟验证[D].天津:天津大学,2008.