離子電荷效應對液晶盒光學特性之影響

Abstract

本論文以探討液晶盒內離子電荷效應對於其光學特性(穿透率及視角) 的變化，透過三種不同型態的配向膜所製作的液晶盒，分別執行三種不同 測試條件(低溫儲存、高溫高溼儲存及高溫儲存)，並於500小時後量測液 晶盒內的離子濃度及光學特性的變化，以期得到其中的相關性，並且藉此 了解此實驗何種的測試條件，對於液晶顯示器造成的品質問題衝擊較大。 至於為何選擇此三種條件，這是因為液晶顯示器普遍的使用地點，不 外乎就是包含這些環境條件，透過此結果，將可以針對其問題來尋求研究 及解決，以提供品質更好及更有保障的液晶顯示器。 其次，此實驗中採用了三種不同配向膜(含二種不同型態的組成，同時 也代表了三種不同預傾角的設計)，所以可探討分析何種型態或預傾角的配 向膜設計對於得到更好的光學特性是最好的設計。 關鍵字：殘影、配向膜、預傾角、離子電荷、離子濃度、液晶顯示器、電 壓保持率、視角、對比、穿透率、摩擦配向、液晶盒。

In this thesis,ion-charge effects on the variation of optical performance of liquid crystal cells was been studied and the optical performance means “transmission”and “view angle”.Three kinds of liquid crystal cells were made by different types polyimide,and then these cells were storage at three kinds of test conditions till after 500 hours,respectively.After that,measure the ion density and optical performance of these cells to get clear dependency. Therefore,at the same time,to know which factor could be the major impact for the quality issue of liquid crystal display. How to decide these test conditions? This is because that all of liquid crystal displays are almost used in these environmental conditions.According to the test result,the problem could be studied and solved to provide better quality liquid crystal displays and enough protection for user. On the other hand,three kinds of polyimides were used in this experiment(including two types polyimide that also represents three kinds of pretilt angles),therefore,it can be investigate which design is good for optical performance.

Keywords：Image Sticking、Polyimide、Pretilt Angle、Ion Charge、 Ion Density、Liquid Crystal Display、Voltage Holding Ratio、View Angle、Contrast、Transmission、Rubbing、Alignment、Liquid Crystal Cell.