Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/10365
標題: Fabricated the Bi-stable Cholesteric Reflective Display and Analized the Optical Complementary Properties
雙穩態反射式膽固醇液晶顯示器之製作與色彩互補特性分析
作者: Tang, Wei-Jen
湯惟仁
關鍵字: Bi-stable cholesteric reflective display;雙穩態膽固醇液晶顯示器;Liquid crystal;液晶
出版社: 材料科學與工程學系所
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摘要: 
本論文主要利用彩色濾光片光阻塗佈的的來製作藍色吸收層,並探討所製作的雙穩態反射式膽固醇液晶顯示器其光電特性。

實驗主要分為三大部分,第一部份,使用相同的製程條件面板( cell gap = 5.0 +-0.2μm),改變不同的液晶比例來進行液晶特性的研究,並量測反射光譜等特性。實驗結果發現:我們可以利用在膽固醇液晶(cholesteric mixture)內分別添加10%、15%、20%、25%比例的向列型液晶(nematic mixture)用來調整顯示器整體的反射波長,當向列型液晶(nematic mixture)添加量增加時,會有效的使顯示器的反射波長由短波長變為長波長,當添加量增加到20%所得到的反射光譜波長正好為575nm為黃色光反射波長,適用與藍色吸收層進行搭配。

第二部分則為探討不同顯示器間隙條件(cell gap)時,面板相關光電特性的變化。在本實驗中利用面板框膠支撐粒子與面板內部支撐球的搭配進行製作三款面板,面板間隙(cell gap)測量值分別為 3.277μm、4.248μm、4.924μm,比較其特性差異,實驗結果發現︰當面板間隙(cell gap)下降時反射亮度會下降,但是對比反而會提升,而且整體的驅動電壓會因為面板間隙(cell gap)減小而下降,實驗數據顯示:當面板間隙(cell gap) 在3.277μm條件下可以得到最低的操作電壓(清除電壓為27V;載入電壓為19V),以及最大對比值13︰1。

第三部份則選擇利用反射波長為575nm液晶比例與面板間隙3.277μm的條件與藍色彩色濾光片光阻進行搭配,製作反射式膽固醇液晶顯示器並與穿透式TN型顯示器進行比較,結果發現:膽固醇液晶顯示器相對於目前廣泛使用TN型液晶顯示器,具有圓視角、色偏程度以及雙穩定狀態的優勢。

The optical and electrical properties of bi-stable cholesteric reflective display with color filter absorption layer were discussed in this thesis.

This experiment dived into three parts. The 1st part, the cell gap condition (cell gap = 5.0 +-0.2μm) were fixed and the different liquid crystal (LC) mixing ratios were varied. We observed that the reflect wavelengths were changed by adding different ratio of nematic LC into cholesteric LC. When increasing the nematic ratio, the reflective wavelength shifted from short wavelength to longer wavelength. The wavelength at 575nm as the yellow reflective light is suitable for blue absorbed layer at 20% of nematic mixture.

The 2nd part, we study the optical and electronic properties of LCD by varying the thickness of cell gap. The thicknesses of the cell gap were varied from 3.28μm, 4.25μm, to 4.92μm. When the thickness of cell gap increasing, the brightness of the reflectance was reduced and the contrast ration was increased. The results show the lowest operating voltage (Resetting voltage is 27V;Addressing voltage is 19V) and highest contrast ratio (13:1) at 3.28μm-thick cell gap.

The 3rd part, the process conditions were fixed at 575nm reflective wavelength of the color filter and 3.28μm-thick cell gap as the bi-stable cholesteric reflective display. By comparing with the standard TN mode display, the better view angle、less color variation properties were observed in chorestric LCD. the bi-stable cholesteric reflective display is suitable for the public display and sign board of train station or air port these public place.
URI: http://hdl.handle.net/11455/10365
其他識別: U0005-3008200600022600
Appears in Collections:材料科學與工程學系

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