配向輝點成因分析及研究

Liquid crystal display domain origin cause of formation is analysed and study

陳恕勛(ShuXun Chen)

指導教授 ： 黃振球

元智大學/工程學院/化學工程與材料科學學系/碩士(2011年)

摘要

配向輝點為LCD(liquid crystal display)基板，負責引導液晶分子排列方向的高分子聚醯亞胺(polyimide)配向膜的摩擦強度不足，導致其烷基側鏈無定向，間接影響其上液晶排列方向性，進而導致畫素內液晶光軸旋轉方向不一致形成區域性畫素內不同亮度差異，產生無法避免的面板報廢及成本損失。
因此本篇論文針對主要影響配向膜的摩擦強度不足之因子做分析。其中增加配向機布毛下壓量使配向膜摩擦強度由18.76提升至24.2可有效提升聚醯亞胺(polyimide)配向膜烷基側鏈定向性，降低摩擦強度不足所產生的配向輝點。且因不同尺寸大小面板面內畫素設計考量易有面內走線高度斷差不同而影響摩擦時遮蔽區域大小，將增加配向膜未被摩擦到的區域大小，故提升摩擦強度將可降低未配向區域的大小由30.9%下降至18.6%，未配向區域減少幅度39.8%可大大減少畫素內未配向區域產生。依數據分析配向輝點不良區域集中液晶再定向製程加熱後洗淨後降溫速率較差的區域，故提升降溫速率，將可有效使液晶於液晶再定向製程時達溶融狀態流動並朝配向膜排列完整。
最後，我們將上述驗證結果 (配向膜摩擦強度增加、液晶再定向製程降溫速率)之最佳參數結合在最佳化實驗中分析得知上下游機布毛壓入量1.2/0.6及搭配液晶再定向製程，加熱後降溫速率提升至16℃/min將可有效將配向輝點不良由14.1%改善下降至0.9%，且經變更條件後經光學量測後輝度及液晶反應時間皆正常無虞，故此2條件搭配可有效提升配向強度並利於改善配向輝點不良。

關鍵字

配向強度 ； 配向膜 ； 畫素走線設計段差 ； 液晶再定向製程製程降溫速率

並列摘要

Some is LCD to match to the brightness Base plate, the high polymer that is responsible for leading the molecule of the liquid crystal to arrange the direction gathers the inferior amine of Xi (polyimide) It is insufficient in intensity to mix to the friction of the membrane, it is omnidirectional to cause its alkyl side chain, influence it have liquid crystal arrange directionality, and then liquid crystal optical axis rotate direction to be inconsistent to form regionality different luminance difference in drawing plain in being plain to lead to the fact picture indirectly, the unavoidable panel scraps and the cost is lost to emerge.
So this page to make analysis to friction intensity enough factor of membrane to mix to influence mainly thesis Is it is it make it rub to machine cloth hair person who press to membrane intensity can raise and gather the inferior amine of Xi from 18.76 to 24.2 effectively to improve not to mix to mix to increase among them (polyimide) Mixing it to the membrane alkyl side chain directivity, the ones that reduced the intensity of rubbing and emerged insufficiently were matched to the brightness to click. And because different size is it is it consider apt to have surface walk line highly broken different influencing while rubbing covering the regional size difference inside to design usually to draw inside the panel, is it is it rubbing into regional size that arrive to membrane to mix to increase, is it rub intensity can is it is it drop to 18.6% to size of area by 30.9% to mix to reduce to improve, is it reduce to area 39.8% range can reduce picture is it produce to area to mix in being plain greatly to mix. Is it concentrate in accordance with data analysis to brightness some bad area on liquid crystal orientation make Cheng lower the temperature speed poor area after cleaning after heating again to mix, raise speed of lowering the temperature, can make liquid crystal orientation melt state flow and towards is arrange to membrane intactly to mix to dissolve to reach when making Cheng again on liquid crystal effectively.
Finally, we prove result while being above-mentioned Best for parameter for the experiments of combining at optimization last visiting machine cloth hair pressing amount 1.2mm/0.6mm from head to foot and not collocating orientation making Cheng of for liquid crystal analysing, lower the temperature speed raise to 16 ℃/ min can effective to is it order to brightness bad to drop to 0.9% by 14.1% of the improvement to mix, and brightness and liquid crystal reflect time all there is not a supposition normally after examining by optics amount after the change condition, so 2 conditions are matched and can be improved and mixed effectively to the intensity and benefit improving to match to the brightness to click badly.

並列關鍵字

Rubbing strength ； Rubbing film ； dot design ； LC ISO thermal temp cooling rate

參考文獻

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