Bistable liquid crystal devices with nanoparticle-coated polyimide alignment films
碩士 === 國立交通大學 === 影像與生醫光電研究所 === 101 === The bistable hybrid-aligned nematic liquid crystal device (HAN-LCD) was fabricated with silica nanoparticle-coated polyimide (PI) alignment films. The triboelectrically-charged silica nanoparticles and the existence of impurity ions in the LC can cause an int...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2012
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| Online Access: | http://ndltd.ncl.edu.tw/handle/26217510879959942492 |
| Summary: | 碩士 === 國立交通大學 === 影像與生醫光電研究所 === 101 === The bistable hybrid-aligned nematic liquid crystal device (HAN-LCD) was fabricated with silica nanoparticle-coated polyimide (PI) alignment films. The triboelectrically-charged silica nanoparticles and the existence of impurity ions in the LC can cause an internal electric field to stabilize the device in the homeotropic state (dark state) after turning off the driving voltage. For switching back to the HAN state (bright state) from the homeotropic state, a voltage pulse with proper polarity was applied for changing the ion distribution in the device. The capability of controlling bistability was achieved through modification of the ion density in the LC layer and the surface properties of the homogeneous PI alignment layer.
In addition, the electro-optical characteristics of the bistable HAN-LCD operated in the dynamic mode were studied and compared with the normal HAN-LCD. Our proposed device is not only being able to operate in bistable display mode, but also in dynamic display mode when appling an AC voltage.
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