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Optical Engineering • Open Access

On-time modulation for liquid crystal displays with insufficient charging time
Author(s): Seung-Woo Lee

Paper Abstract

I propose on-time modulation (OTM) to compensate for insufficient time to charge column lines in liquid crystal displays (LCDs). OTM modulates turn-on times of row signals as a function of column signal delay. Most LCD panels for monitors and laptop computer displays adopt a two-line inversion. OTM extends turn-on times of even row signals and reduces pulse widths of the next odd rows. Experimental results showed that turn-on times of even row signals should be unequally extended in accordance with a distance of the row from a column driver. Because OTM successfully solves the charging time problem, it contributes to the success of 120-Hz driving, which has been widely investigated to solve motion blur in LCDs, but has a very severe charging problem.

Paper Details

Date Published: 1 March 2008
PDF: 3 pages
Opt. Eng. 47(3) 030503 doi: 10.1117/1.2890161
Published in: Optical Engineering Volume 47, Issue 3
Show Author Affiliations
Seung-Woo Lee, Kyunghee Univ. (South Korea)

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