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Study on the Improvement of Mura in Polymer Stabilized Alignment by CF Common Electrode Curing
|關鍵字:||陣列供應電壓;Array com curing;彩色濾光片供應電壓;聚合物穩定配向技術;聚合物單體;一次曝光機;一次曝光液晶檢查機;二次曝光機;CF com curing;PSA;Monomer;UV1;AULCI;UV2||出版社:||光電工程研究所||引用:||洪世章 and 呂巧玲, "台灣液晶顯示器產業之發展," 中興大學, 淡江大學 (2001). 沈彥志, "液晶顯示器驅動電路之研究," 暨南國際大學電機工程學系碩士論文 (2008). 陳弘毅, "可調整式Gamma矯正薄膜式電晶體液晶顯示器之驅動晶片," 南台科技大學電子工程研究所碩士學位論文 (2004). 郭建廷, "多域垂直配向軟性顯示器之研究," 中山大學光電工程學系碩士論文 (2009). 林佳興, "軟性顯示器製造流程與品質特性指標之研究," 東海大學工業工程與經營資訊研究所碩士論文 (2010). 陳思宏, "彩色濾光片MURA瑕疵之自動化檢測," 義守大學工業工程與管理學系碩士學位論文 (2006). 王信評, "應用反射光譜探討摩擦聚醯亞胺膜及其表面異向性對液晶配向之影響," 中山大學光電工程研究所碩士論文 (2008). 友達光電股份有限公司http://www.auo.com/?sn=58&lang=zh-TW 陳昭安, "液晶配向技術結合紫外線曝光機液晶檢查之研究," 中興大學電機工程學研究所碩士學位論文 (2011). Shingo Kataoka, Takahiro Sasaki, Arihiro Takeda and Yoshio Koike “Alignment Condition and T-V Characteristics in MVA-LCDs”,SID’97 digest of Tech. Paper, 28, pp 845, 2997 王珍珍, "混合聚亞醯胺配向膜調控液晶預傾角之研究與用," 成功大學光電科學與工程研究所 (2008). 柯仲隆, " Polydimethylsiloxane 及 Su-8 之微結構物的製備及其用於液晶顯示器的研究," 中山大學光電工程研究所碩士論文 (2008). 謝嘉定,黃啟炎, "雙易取向軸IPS液晶元件之光電特性研究," 彰化師範大學光電科技研究所. 林良真, "使用雙面光配向技術製作高效率與偏振無關的染料摻雜液Fresnel光學透鏡," 成功大學物理研究所 (2007). 陳怡君, "對膽固醇液晶雷射輸出大範圍調控之研究," 成功大學物理研究所 (2005). 陳文政, "摻雜奈米粒子及偶氮染料的液晶薄膜之光配向研究及應用," 中山大學光電工程研究所 (2009). K. Hanaoka, Y. Nakanishi, Y. Inoue, S. Tanuma, Y. Koike, and K. Okamoto, "40.1: A New MVA‐LCD by Polymer Sustained Alignment Technology," SID 04 DIGEST, pp 1200-1203 (2004). C. Y. Huang, W. Y. Jhuang, C. T. Hsieh, and C. H. Lin, "Switching of polymer-stabilized vertical alignment liquid crystal Pi cell-curing voltage and driving scheme effects," Japanese Journal of Applied Physics, vol. 48, pp. 0210 (2009). S. G. Kim, S. M. Kim, Y. S. Kim, H. K. Lee, S. H. Lee, G. D. Lee, J. J. Lyu, and K. H. Kim, "Stabilization of the liquid crystal director in the patterned vertical alignment mode through formation of pretilt angle by reactive mesogen," Applied physics letters, vol. 90, pp. 261910-261910-3 (2007). Y. H. Tseng and D. M. Tsai, "Using independent component analysis based process monitoring in TFT-LCD manufacturing," Journal of the Chinese Institute of Industrial Engineers, vol. 23, pp. 262-267 (2006). Y. J. Lee, S. J. Jang, J. W. Jung, H. R. Kim, M. Y. Jin, Y. Choi, and J. H. Kim, "Mechanical stability of pixel-isolated liquid crystal mode for flexible display application," Molecular Crystals and Liquid Crystals, vol. 458, pp. 81-87 (2006). H. R. Kim, J. W. Jung, Y. J. Lee, and J. H. Kim, "Liquid crystal alignment with a molecular template of imprinted polymer layer during phase separation," Applied physics letters, vol. 88, pp. 113504 (2006). H. Ren, Y. H. Fan, and S. T. Wu, "Liquid-crystal microlens arrays using patterned polymer networks," Optics letters, vol. 29, pp. 1608-1610 (2004). M. Kaczmarek, A. Dyadyusha, S. Slussarenko, and I. Khoo, "The role of surface charge field in two-beam coupling in liquid crystal cells with photoconducting polymer layers," Journal of applied physics, vol. 96, pp. 2616 (2004). S. Leclair, L. Mathew, M. Giguère, S. Motallebi, and Y. Zhao, "Photoinduced alignment of ferroelectric liquid crystals using azobenzene polymer networks of chiral polyacrylates and polymethacrylates," Macromolecules, vol. 36, pp. 9024-9032 (2003). P. Pagliusi and G. Cipparrone, "Surface-induced photorefractive-like effect in pure liquid crystals," Applied physics letters, vol. 80, pp. 168 (2002). D. McPhail and M. Gu, "Use of polarization sensitivity for three-dimensional optical data storage in polymer dispersed liquid crystals under two-photon illumination," Applied physics letters, vol. 81, pp. 1160 (2002). J. Stöhr and M. Samant, "Liquid crystal alignment by rubbed polymer surfaces: a microscopic bond orientation model," Journal of electron Spectroscopy and related phenomena, vol. 98, pp. 189-207 (1999). L. Corvazier and Y. Zhao, "Induction of liquid crystal orientation through azobenzene-containing polymer networks," Macromolecules, vol. 32, pp. 3195-3200 (1999). J. Stejskal, A. Riede, D. Hlavatá, J. Prokes, M. Helmstedt, and P. Holler, "The effect of polymerization temperature on molecular weight, crystallinity, and electrical conductivity of polyaniline," Synthetic metals, vol. 96, pp. 55-61 (1998). J. Lu, S. Deshpande, E. Gulari, J. Kanicki, and W. Warren, "Ultraviolet light induced changes in polyimide liquid‐crystal alignment films," Journal of applied physics, vol. 80, pp. 5028 (1996). 林宸生, "TFT-LCD基板缺陷之自動化檢測," 逢甲大學資訊電機工程碩士在職專班碩士論文 (2008). 張柎溢, "彩色濾光片缺陷檢查之收束擴散光源系統研究," 勤益科技大學電子工程系碩士班碩士論文 (2008). 張瑞顯, "應用線性迴歸診斷法於液晶顯示器 Mura 缺陷 自動化檢測之設計與實現," 成功大學製造工程研究所碩士論文 (2005). 吳建瑋 and 王瑞杰, "應用六標準差手法於 TFT-LCD 之 ODF 製程改善研究," 逢甲大學工業工程與系統管理學系, 友達光電股份有限公司 (2006). 陳裕仁, "色序法與區域控制液晶面板之發光二極體背光燈驅動系統," 中正大學電機工程學系碩士論文 (2008). 楊文虎, "以近接曝光製作光學增亮膜研究," 台灣科技大學機械工程系碩士學位論文(2007). 黃朝義, "LCD 技術動向分析," PIDA Photonics Industry and Technology Development Association, vol. 32, pp. 47-54 (2001). 李鴻鈞, "液晶Monitor技術發展趨勢," 光連:光電產業與技術情報, pp. 16-22 (1997).||摘要:||
Polymer stabilized alignment (PSA) technique is a newly born item in the field of the wide-viewing angle (WA) technique. The followings are the brief fabrication processes: first, to mix the monomer into the liquid crystal; then to let the liquid crystal form a tilt angle by providing the electrical power in order to bond the monomer and the polyimide (PI); finally, through UV light exposure to let the monomer react into the polymer and to let the liquid crystal has its own standing position at the same time. Compared with the multi-domain vertical alignment (MVA) technique, in the field of the fabrication process, the color filter (CF) substrate could reduce the process step of the protrusion formation, which can reduce the cost efficiently; in the field of the optical performance, the faster response time (RT) could reduce the burn-in phenomena while dynamic playing, and the higher contrast ratio (CR) could make the black state much darker and the white state much brighter. The higher aperture ratio (AR) could let the backlight module become much brighter under the same applying voltage to achieve the goal of the energy conservation.
This study endeavored to compare the difference between the array com curing power supply mode and the CF com curing power supply mode and then discussed the optimum optical characteristic accompanying with AC or DC voltages and gate grounded or not. Except for the applying voltage, the UV light exposure time of UV1、the temperature of the platform and the UV light exposure time of UV2 were also the important factors which would affect the optical characteristic and also be included in this study’s scope.
From this study, we had found that the optical characteristic of the CF com curing with AC voltage was better than that of the array com curing with AC voltage. It could be due to that the voltage of the array com curing flowed through the storage capacitor (Cs), but the voltage of the CF com curing didn’t. Besides, the optical chracteristic of the CF com curing with AC voltage plus DC voltage was better than that only with AC voltage, which could be due to that the liqid crystal had suffered from the AC voltage disturbing in the beginning. There were nearly no diffirence about the gate grounded or not, and the contrast ratio (CR) resulted in the only difference, it could be due to that the voltage had flowed through the array elements or not so far. Subsequently, we change the UV light exposure time of UV1, the longer the exposure time, the more polymer formed from that the monomer reacted into the polymer reaction inside the liquid crystal. The more polymers the more standing position for the liquid crystal. Then, we change the temperature of the platform of UV1 which will affect the reaction rate of the monomer and the polyimide. The higher temperature, the faster reaction rate, but would result in pretilt angle in different direction. The lower temperature, the slower reaction rate, and will resulted in rotation displacement defect of the liquid crystal. When we change the exposure time of UV2, it will affect the residue of the monomer inside the liquid crystal, and too much residue will result in image sticking phenomena.
Eventually, from the above experiment data, we choosed the optimum condition and utilizied the Auto UV1 liquid crystal inspection (AULCI) and the staff’s inspection to double check, in order to ensure the quality of the products.
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