高精確穿透式液晶光電元件空穴厚度的量測分析

Abstract

光電的產業在二十一世紀是最具前景的產業之一。 根據經濟部工業局2005年指出，未來五年台灣在光電平面顯示器產業的投資金額可達一兆新台幣，成為全球平面顯示器的重要供應國及研發重鎮。 本論文研究主旨在測量液晶光電元件的空穴厚度，液晶空穴厚度會影響液晶物質的反應時間、閥值電場的大小及相位延遲，此三種因素與平面顯示器的影像品質息息相關。我們使用兩種實驗方法來量測穿透式液晶光電元件空穴厚度︰(i)以多波長的光源(200 nm ~ 2600 nm)垂直入射，量測液晶元件(5.7 m 和9.0 m兩種空穴厚度)的反射率及穿透率，在可見光波長範圍(500 nm ~ 700 nm)以Fabry-Perot效應分析，空穴厚度的測量值與真值之相對誤差率約為2 % ~ 10 %；(ii)以單一波長(632.8 nm)雷射光，採取布魯斯特角入射液晶光電元件，並使用USB介面傳輸反射干涉條紋實驗數據，大大提高了空穴厚度的準確度(相對誤差率約為0.07 %)，這種方法極為適合推廣至高中光學實驗教學課程。Abstract

The photoelectric industry is one of the world-leading high-tech industries of the 21st century. According to the source from the industrial development bureau, Ministry of Economic Affairs in 2005, the amount of the investment in the photoelectric flat panel display industry in the next five years is estimated to be one trillion new Taiwan dollars, which not only builds Taiwan up to be one of the most important supply countries globally but also shapes Taiwan as an important research center. This thesis aims to analyze the cavity thickness of the transmission-type photoelectric liquid crystal component (PLCC), and how it will affect responding time, size of the threshold value at the electric field, and phase delay, which are the three major factors influencing the image quality of the display. Two methods are used to measure, examine, and improve cavity thickness of the transmission type PLCC. (i) The first is to measure the reflection rate and the transmission rate of the photoelectric liquid crystal component of which two cavity thickness were studied, namely, 5.7 m and 9.0 m, and a difference in the vertical incidence of the multi-wave light source ranging from 200 nm to 2600 nm was recorded. The values were then applies to the Fabry-Perot theory. After calculations were completed, the deviation rate between the truth value and the measurement value was shown to be from 2 % to 10 % ; (ii) The second method is to use a laser (632.8 nm) of discrete wavelength the fixed on the Brewster Angle of incidence and using an USB interface to transmit and reflect interference fringe. From the experimental data obtained the accuracy (relative deviation rate 0.07 %) of the cavity thickness is shown to improve. This method due to it’s low cost and high safety is also extremely suitable for promoting an optics experiment course in high school.