This study investigated the electro-optic characteristics of VAN ¡]vertical-alignment nematic¡^liquid crystal device in passive mode, and tried to present the advantage of high contrast ratio which belongs to VA mode. The experiment consisted of three parts: 1. Change different cell thickness¡]d = 12£gm¡B6£gm¡B4.9£gm¡^. 2. Chang LC with the different value of dielectric¡]£G£`= -3.7¡B-6.1¡^. 3. Chang LC with different refraction anisotropy¡]£Gn = 0.15¡B0.078¡^. We drive those samples with different number of duty in passive mode, and to measure the electro-optic characteristics, including VT curve, response time, and contrast ratio.
We knew that STN¡]Super Twist Nematic LCD¡^has the drawbacks of lower contrast ratio, higher operational voltage and slower response time within higher duty in passive mode. And the same problem comes with VAN in passive-drive mode, although it is said VAN has the high performance of contrast ratio. The contrast ratio is worse then STN when driving in higher duty. As a result of VAN is kind of ECB mode, its transparency has a big matter with light retardation. We find that in the same condition of driving duty, the value of cell gap or the £Gn become larger, the value of the sharpness and the contrast ratio become larger.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0125108-144906 |
| Date | 25 January 2008 |
| Creators | Lee, Hsi-kun |
| Contributors | Mei-ying Chang, Tsung-hsien Lin, Wen-jun Zheng, Wen-yao Huang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0125108-144906 |
| Rights | withheld, Copyright information available at source archive |
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