|Author's Email Address
||This thesis had been viewed 5351 times. Download 169 times.|
|Type of Document
||Influence of Dynamic Drive Scheme parameters on the performance of reflective cholesteric liquid crystal displays|
|Date of Defense
||dynamic drive scheme
cholesteric liquid crystal
||The conventional driving method used in the cholesteric liquid crystal display has a major problem：The addressing time per line is about 50 ms which is too slow for high resolution display, therefore the DDS (dynamic drive scheme) method was developed to solve this problem. |
DDS has three phase voltages to drive cholesteric liquid crystal display, which are the preparation phase, selection phase, and evolution phase. Two important properties of the cholesteric liquid crystal used by DDS are as follows; the transition from homeotropic state to transient planar state is on the order of 1 ms. Another transition from homeotropic state to focal-conic state is on the order of 100 ms.
Preparation phase is used to transit LC to homeotropic state. Selection phase is used to control the state after the dynamic drive. Evolution phase is used to transit the state to planar or focal-conic. This thesis studies the dynamic drive scheme parameters on the performance of reflective cholesteric liquid crystal displays.
The presented measurement method can be used to obtain the operating parameters of dynamic drive scheme for use in cholesteric liquid crystal reflective displays. As the selected voltage for preparation phase increases, the range of operating voltage in evolution phase gets widened. The required Von and Voff in selection phase would change and the voltage range of evolution phase narrows if we shorten the driving time of selection phase. In evolution phase, the reduction in operating time can raise the selection range of driving voltage.
||Andy Y.G. Fuh - chair|
Wei Lee - co-chair
Kuang-Yao Lo - co-chair
Chi-Yen Huang - co-chair
Tsung-Hsien Lin - advisor
Indicate in-campus at 5 year and off-campus access at 5 year.|
|Date of Submission