提昇膽固醇膽固醇液晶顯示器亮度之光學薄膜設計

Abstract

反射式液晶顯示器擁有許多優點，像是重量輕、低功率消耗以及可在陽光下閱讀，因而相當適合應用在電子書以及電子看板的市場上。但是反射式顯示器還是有許多問題需要解決，例如低亮度、低對比以及視角小，導致在應用性來講受限很多。微光學元件擁有設計彈性，低價位等優點，所以適合應用於提昇反射式顯示器的光學表現。已經有許多方法提出並有不錯的效果，但是它們都有各自的缺點，例如製作複雜度、價格、或是應用限制性。 在這篇論文中，提出了菱鏡陣列薄膜並驗證用於膽固醇液晶顯示器提昇對比以及亮度之效果。提出的光學薄膜可以簡單的貼在顯示器之表面上，藉由微結構將反射光的角度偏移炫光的角度以提昇對比。另外，薄膜的製程可以使用卷對卷技術，便於使用在大型看板上。藉由評估反射角度以及實驗驗證，提出的菱鏡陣列薄膜有潛力應用於膽固醇液晶電子看板上。 菱鏡設計是根據鏡面反射而設計的，我們驗證在電溼潤顯示器上菱鏡薄膜可以提昇一定的亮度。所以除了膽固醇顯示器外，它也有潛力可以應用在其他反射式顯示器上。

The reflective liquid crystal displays which have many remarkable advantages, such as light weight, low power consumption, and sunlight readable, have become very popular devices for mobile and billboard applications. Nevertheless, there are still several issues like low brightness, poor contrast, and small viewing angle. Microoptics which have the advantages of design flexibility and low cost are well developed and applied to increase the optical performance of the reflective type LCDs. In this thesis, the prism array film (PAF) was demonstrated for improving the contrast ratio and brightness of the cholesteric liquid crystal display. The optical film can be easily laminated on the top surface of the Ch-LCD to separate the reflected image from glare position, hence, improving the image quality. Moreover, the fabrication process can adapted to the roll to roll process for billboard application. The proposed optical film can be applied to other reflective LCDs based on specular reflection. The performance on Electrowetting display was improved using PAF. Therefore, PAF has potential to be applied to both E-book and E-banner application.