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研究生:林裕軒
論文名稱:多功能且具成本效益之液晶顯示單元光學參數量測系統的發展
論文名稱(外文):Development of Multiple-functional, Cost-effective Liquid-crystal Cell Optical Parameter Measurement Systems
指導教授:張國維
學位類別:碩士
校院名稱:國立臺灣師範大學
系所名稱:機電科技研究所
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2007
畢業學年度:94
語文別:中文
論文頁數:53
中文關鍵詞:液晶單元間隙相位延遲預傾角扭轉角液晶顯示器
外文關鍵詞:Cell gappretilt angletwist anglephase retardationliquid crystal display
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近年來,政府極力推動「兩兆雙星」計畫,使得光電平面顯示器儼然成為我國重點發展產業科技項目之一;例如,2005年台灣顯示器產業在全球該類產品的市場佔有率已達31%。該項科技產值在台灣光電產業中,佔有63%之比例(約新台幣7,141億),位居第一名,且預計逐年擴增,其中液晶顯示器佔有絕大多數的比例(約新台幣7,013億)。因此,為了有效提升液晶平面顯示器產量與品質管制之需求,進行液晶顯示單元之光學參數量測系統技術之研究與發展是刻不容緩的。
我們的目標係發展一套多功能且具成本效益之液晶顯示單元光學參數量測系統,來降低該類儀器的成本,以期能減少對國外廠家的依賴,進而提高國內顯示器產業的競爭力。在本論文中,我們首先進行過去作法之系統架構的學理分析與性能評估,然後提出一個簡單的系統結構且相當經濟的方法,來達成多功能的量測系統。此系統是以起偏器-液晶單元-補償器-檢偏器架構為基礎,透過晶體旋轉法量測液晶單元之預傾角(pretilt angle),再使用極化量測法來量測其間隙(cell gap)與扭動角(twist angle)等,攸關液晶顯示品質的重要光學參數。除此之外,此系統還可測量電壓-穿透率曲線(voltage-transmittance (V-T) curve)等光電特性。針對此系統,我們提出學理、模擬、實驗與系統製作的方法,並且說明整體的可行性分析。實驗的結果顯示此方法所量測的結果是相當令人滿意的(例如,液晶單元間隙的誤差百分比為1.45%)。
For years, the government has promoted the “Two Trillion and Twin Star Industries Development” plan. As a result, the flat panel displays (FPDs) had become one of the most important industrial applications. For example, the FPDs in Taiwan occupied 63% (about $NT 7,141 hundred million dollars) of the optoelectronics industry in Taiwan and 31% in the market of the FPDs in the world in 2005. Therefore, to promote effectively the output and quality of the FPDs, it is very urgent to research and develop the LC cell optical parameter measurement systems.
The objective of this paper is to develop a multiple-function and cost-effective measurement system to lower the dependency of foreign instrument makers and to reduce the manufacturing cost for the industry. In the paper, we first study the past approaches and analyze their measurement performance. Then, a simple and cost-effective method will be proposed to achieve the multiple functions. This system on the basis of the PSCA configuration uses the crystal rotation method to measure the pretilt angle of the sample under test, and the polarimetry to measure the cell gap and twist angle of it. These optical parameters highly influence the display quality. That is, in addition to the measurement of the three important optical parameters, this system can also measure the voltage-transmittance (V-T) curve. For this system, we will do the theoretical study, simulation, experiment, system implementation to show its feasibility. From the experiment results, it is shown that the measured results were quite satisfactory. For example, the error percentage was 1.45 %.
目錄
謝誌 ………………………………………………………………… II
中文摘要 …………………………………………………………… III
英文摘要 …………………………………………………………… IV
目錄 ………………………………………………………………… V
圖目錄 ……………………………………………………………… VII
表目錄 ……………………………………………………………… VIII
第一章 緒論………………………………………………………… 1
1.1 研究背景及目的 …………………………………………… 1
1.2 論文架構 …………………………………………………… 4
第二章 理論基礎…………………………………………………… 5
2.1 液晶顯示基本原理與光電特性 …………………………… 5
2.1.1 液晶單元像是光旋轉子 ……………………………… 6
2.1.2 TFT-LCD的液晶單元工作原理像是光閥……………… 7
2.2 液晶單元的光學參數………………………………………… 8
2.2.1 預傾角 ………………………………………………… 8
2.2.2 液晶單元間隙(或相位延遲)…………………………… 9
2.2.3 扭轉角 ………………………………………………… 9
2.3 Stokes極化參數……………………………………………… 10
2.4 極化量測法與其系統架構說明……………………………… 12
第三章 液晶單元光學參數量測方法研究………………………… 17
3.1 晶體旋轉法(量測預傾角) …………………………………… 17
3.2 Stokes參數法(量測扭動角,量測液晶間隙) ………………… 20
第四章 系統整合…………………………………………………… 22
第五章 實驗量測…………………………………………………… 26
5.1 系統校正……………………………………………………… 26
5.2 電壓-穿透率的實驗 ………………………………………… 30
5.3 預傾角的實驗………………………………………………… 31
5.4 液晶單元的間隙與扭轉角實驗……………………………… 33
5.5 系統效能評估………………………………………………… 35
第六章 討論與未來工作…………………………………………… 37
參考文獻 …………………………………………………………… 39
附錄一:E7液晶特性………………………………………………… A-1
附錄二:液晶空盒的規格…………………………………………… A-2
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