Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2998
標題: 利用彩色濾光片供電方式改善聚合物穩定配向技術中影像瑕疵之研究
Study on the Improvement of Mura in Polymer Stabilized Alignment by CF Common Electrode Curing
作者: 蔡哲軒
Tsai, Che-Hsuan
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
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摘要: 
聚合物穩定配向技術在廣視角技術中算是一個較新的名詞,其作法為先將聚合物單體摻雜於液晶內,之後透過供電使液晶產生一預傾角,讓聚合物單體與聚亞醯胺鏈結,最後再照射紫外光讓聚合物單體反應成聚合物,讓液晶有站立的方向性及位置。與多域垂直配向技術相互比較,在製程上,彩色濾光片上可減少一道突起物製程,有助於成本降低;在光學上,反應時間加快可以使動態播放時不易有殘影現象,對比度變高可以讓暗態更暗、亮態更亮,開口率變高可以讓背光模組在不增加電壓的狀態下使亮度更亮,達到節省能源的效果。
本研究主要針對兩種不同供電模式,陣列供應電壓和彩色濾光片供應電壓兩者相互比較,並搭配交、直流電壓以及閘極接地與否等條件,探討其光電特性。除電壓之外,一次曝光機之紫外光照射時間、平台溫度以及二次曝光機照射時間等因素也是影響光學特性之重要因素,因此也在本研究的範圍當中。
研究發現彩色濾光片供應交流電壓其光學特性優於陣列供應交流電壓,其原因為陣列供應電壓會經過儲存電容,彩色濾光片供應則無之故;而彩色濾光片供應交流電壓加直流電壓之光學特性又較彩色濾光片供應交流電壓佳,其原因為液晶有先受交流電壓擾動之故;至於閘極接地與否,其特性差異不大,唯一較有差別者為對比度,目前推測原因可能與電壓有無經過陣列元件有關。緊接著針對一次曝光機之紫外光照射時間長短作一變化,照射時間愈長,液晶內部的聚合物單體反應成聚合物會愈多,聚合物愈多,液晶站立的位置也會愈多。在針對一次曝光機平台溫度高低作變化則會影響到聚合物單體與聚亞醯胺的反應速率,溫度愈高,反應速率愈快,但會有不同方向之預傾角;溫度愈低,反應速率愈慢,會有液晶旋轉位移瑕疵產生。變化二次曝光機照射時間長短會影響到液晶內部的聚合物單體殘存量,殘存量太高則會有影像殘留現象產生。
最後從以上實驗數據中,得到最佳製程參數,並利用一次曝光液晶檢查機與人員觀看兩種檢測模式相互確認,以確保產品品質。

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.
URI: http://hdl.handle.net/11455/2998
其他識別: U0005-2608201212023800
Appears in Collections:光電工程研究所

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