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標題: | 液晶槽之力學行為分析與快速設計準則 Mechanical Analysis and Instant Design Criteria for Liquid Crystal Cell with Photospacers |
作者: | Ling-Yi Ding 丁領億 |
指導教授: | 張培仁 |
共同指導教授: | 施文彬 |
關鍵字: | 平面液晶顯示器,液晶槽,間隙子,Gap Mura,Gravity Mura,Winkler模型, Flat liquid crystal display,liquid crystal cell,gap Mura,gravity Mura,photospacer,Winkler model, |
出版年 : | 2011 |
學位: | 博士 |
摘要: | 隨著平面液晶顯示器尺寸之成長,液晶槽結構內部的應力所衍生的缺陷也日益顯著。Mura就是典型液晶顯示器之缺陷,其原因在於玻璃基板的過度變形,使得光穿透之路徑產生明顯的偏差,並於螢幕上造成亮度與顏色不均勻之現象。而Mura之種類則依照缺陷之形狀與成因等所命名,例如:點狀、蛋型與漏光Mura等。
目前分析Mura之方法多採用有限元素法來還原液晶槽內部所發生之光學或力學行為等,但是對於設計液晶槽與避免Mura之發生,仍必須依據大量的模擬與實驗數據並透過田口法來制定最佳的設計範圍,此設計方式耗時且缺乏直觀之力學依據。本研究提出液晶槽之解析力學模型來分析其內部結構的力學行為,以避免Mura的產生。此解析力學模型乃延伸於典型之Winkler模型,結構由一個雙邊固定之樑結構與數個線性彈性體所組成,透過此力學模組便可以有效地預測液晶槽內部結構之變形與受力狀態,並提供設計者快速且準確的液晶槽設計規範。 本研究中,間隙子受外力之塌陷所產生之Gap Mura與液晶材料受重力之影響所導致的Gravity Mura為主要分析的目標。本文將詳細敘述如何建立兩大問題的液晶槽力學模型,並透過無因次化分析與輔助力學模型來解得液晶槽模型的解析解,此解析模型更經過有限元素模擬的修正來補償無法考慮的變數並提高解析解的精準度,最後提出兩大問題的液晶槽設計規範以避免Gap與Gravity Mura的產生。此研究之貢獻在於建立複雜的液晶槽理論模型與克服多尺度結構模擬之困難,並提供快速且準確的液晶槽設計規範,以有效地節省平面液晶顯示器於設計與製程上時間與成本。另外,此力學模型更可應用於內嵌式的觸控液晶顯示器的設計,以預估外力對顯示器造成的影響,以提高觸控式液晶顯示器的可靠度。 Gap and gravity Mura due to the improper deformation of color filter glass are the familiar defects in large-sized liquid crystal displays. This investigation presents two different types of analytical models for liquid crystal cell under applied loading and gravity force to prevent the occurrence of gap and gravity Mura. These analytical models are established from the Winkler model which is composed of a beam and an elastic foundation since the relationship of force-deflection in Winkler model is linear. Therefore, these analytical models can be utilized to describe the correlation between the mechanical behaviors of color filter glass and photospacers in liquid crystal cells. The analytical solutions of liquid crystal cell models have been derived under the specific assumptions and the alternative models for linearization. All the analytical solutions have to be modified through the finite element analysis to improve their accuracy of analytical models. Furthermore, the analytical model for gap Mura analysis can also be extended to the design of in-cell touch panel since the local loading due to touch and probe testing are both considered in the analytical model. Consequently, these analytical models for liquid crystal cell can be used to provide instant design criteria for the structures of liquid crystal cell and to enhance the reliability of liquid crystal displays without considerable simulation and experimental data. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/37995 |
全文授權: | 有償授權 |
顯示於系所單位: | 應用力學研究所 |
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