Spontaneous Polarization Influence of V-shaped Switching Ferroelectric Liquid Crystals on Pulse Driving Using Active Switch
| Autor: | Eugene P. Pozhidaev, Hiroshi Moritake, Kohji Toda, F. V. Podgornov, Wolfgang Haase |
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| Rok vydání: | 2006 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) business.industry Pulse (signal processing) Transistor General Engineering General Physics and Astronomy Ferroelectricity Ferroelectric capacitor law.invention Light intensity Capacitor Optics Liquid crystal law Optoelectronics business Voltage |
| Zdroj: | Japanese Journal of Applied Physics. 45:7538-7542 |
| ISSN: | 1347-4065 0021-4922 |
| DOI: | 10.1143/jjap.45.7538 |
| Popis: | The influence of spontaneous polarization on the active driving of V-shaped switching ferroelectric liquid crystals is discussed. Two ferroelectric liquid crystals with a high spontaneous polarization (200 nC/cm2) and a low spontaneous polarization (7 nC/cm2) are used in this study. The field-effect transistor used as an active switch and a storage capacitor is set parallel to a liquid crystal cell. In a high-spontaneous-polarization material, cell voltage increases, while the transistor is in the on-state. After the application of external driving voltage, cell voltage decreases owing to the discharging of the storage capacitor due to the changes induced by spontaneous polarization. On the other hand, in a low-spontaneous-polarization material, the decrease in cell voltage after the application of external driving voltage is very small. The low-spontaneous-polarization material, compared with the high-spontaneous-polarization material, is advantageous for controlling light intensity by active driving. |
| Databáze: | OpenAIRE |
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