Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/91847
標題: 噴墨製程技術於導光板微透鏡結構之應用
Microlens Array of Inkjet Printing Technology for Light Guide Plate Applications
作者: Tsung-Lin Ho
何宗霖
關鍵字: 背光模組;噴墨印刷製程技術;薄型導光板;微透鏡;按需噴墨;ink-jet pringting;light guide plate(LGP);liquid crystal display(LCD);drop-on-demand.
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摘要: 
近年LCD (Liquid Crystal Dispaly) 市場薄型化整體模組要求為之嚴苛;所有相關製程皆要求薄型設計。因此薄型化導光板設計,對背光模組產業需求更加嚴峻。薄型化導光板在射出成形時,需要高射速、高射壓進行模穴填充,常因殘留內應力造成導光板變形、翹曲等問題。噴墨印刷製程技術(Ink-Jet Printing)的按需噴墨(Drop-on-demand)及直接書寫(Direct writing)特性,故無須製作微結構之模仁及模具,可大幅縮短開發時程,且降低成本,因此背光模組廠認為此新式製程技術相當具有潛力開發薄型化導光板。
本研究進行噴墨材料介紹、基板疏水 Primer Coating 表面處理、噴墨微透鏡成形最佳製程參數設計、光學網點設計及成品光學檢測。使用 Miyakawa MLP-850UV 設備,運用噴墨印刷製程技術進行陣列式微透鏡導光板製作,並建立噴墨列印技術製作導光板之完整製程方式。使用準高分子 UV 固化型墨水(Polyacrylamide)作為材料,搭配噴墨成形最佳製程參數,驅動電壓22 V及墨夾與基板距離0.8 mm,經第一道噴墨製程、疏水層Primer Coating表面處理後,於疏水性基板上加工第二道噴墨製程成形微透鏡 Lens 陣列排列。
使用小尺寸13.3吋機種,搭配光學網點密度設計,實際噴印為直徑70μm、高度14μm 、覆蓋率0.539 之微透鏡尺寸、並控制疏水層Primer 薄膜厚度為0.723μm、折射率為1.509。經噴墨印刷技術,成功製作出平均輝度為2419.18nits 及均齊度為87.84% 之13.3吋噴墨導光板,因而展示噴墨印刷製程技術應用於薄型導光板快速製作之能力。

In the recent years, with the raise in standard of Liquid Crystal Display (LCD) thin module, thin design becomes indispensable in the manufacturing process. Therefore, the back light module industry demands stricter design in thin light guide plate. While injecting thin light guide plate, high injection speed and molding pressure are required, so the remained residual stress often causes the plate transformed and warped. To resolve this, we can apply the properties of ink-jet printing, drop-on-demand and direct writing. By introducing these properties, no microstructure mold and stampers are fabricated, so the development period and cost can be reduced dramatically.
In this paper, we will introduce printing materials, surface treatment of primer coating, parameter optimization of printing microlens, optimal design and product verification. With Miyakawa MLP-850UV, ink-jet printing process is used to manufacture micro lens array light guide plate, and establish the complete process. In our design, we adopted UV polyacrylamide, optimized ink-jet printing, 22V driving voltage, and 0.8mm substrate gap. After the first printing process and the hydrophobic layer with primer coating, we proceed with the second printing process on the substrate to form the micro lens array.
13.3' machines is operated with optical design, to control the micron lens of 70μm in diameter, 14um in height, and 0.539 coverage. Film size of hydrophobic layer primer is controlled by 0.723μm in thickness and 1.509 refractive index. With ink-jet printing technique, we can successfully manufacture 13.3' ink-jet light guide plate with 2419.18 nit luminance and 87.84% luminance uniformity in average. The experiment result validates the ability of Ink-Jet printing process in manufacturing thin light guide plate.
URI: http://hdl.handle.net/11455/91847
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