Paper Info
Title
Effect of 2+2 dynamic drive scheme on electro-optical characteristics in cholesteric liquid crystal displays.
Abstract
We have developed and extended the basic idea of 2+2 dynamic driving scheme (DDS) for a VGA (640×480) panel and optimized it to show the ON–OFF switching characteristic. The temperature dependence of selection time of 2+2 DDS is similar with that of 3+2 DDS. The position dependence upon pre and post selection is serious and not suitable for driving the panel. We found that two steps of a propagation period provide the most stable homeotropic state and ON–OFF switching system. With this new driving scheme the potential gray scale for Ch-LCD in a 640×480 pixels matrix was examined. The gray scale can be obtained at a relatively higher voltage. We obtain 32 gray numbers and above 20 potential grays with 40V of Vpeak and 1.2ms/line of scan driving time in the VGA panel. Our 2+2 DDS may be useful for foldable display applications, such as for electronic paper.
Year
DOI
Venue
2006
10.1016/j.displa.2005.07.002
Displays
Keywords
Field
DocType
Dynamic driving scheme (DDS),Gray scale,Cholesteric liquid crystal display (Ch-LCD),Bistable LCD
Voltage,Optics,Cholesteric liquid crystal,Frequency synthesizer,Liquid-crystal display,Engineering,Direct digital synthesizer,Electronic paper,Video Graphics Array,Commutation
Journal
Volume
Issue
ISSN
27
1
0141-9382
Citations 
PageRank 
References 
0
0.34
0
Authors
2
Name
Order
Citations
PageRank
Woon-Seop Choi100.34
Hyun-Soo Shin200.68