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Semiconductor Physics, Quantum Electronics & Optoelectronics. 2010. V. 13, N 2. P. 173-176.
Elimination of the data-dependent defects by doubling
the frequency of driving signals for cholesteric LCDs
V. Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine
45, prospect Nauky, 03028 Kyiv, Ukraine
Phone: +38 (044) 525-97-86; e-mail: andriy.rybalochka@gmail.com
Abstract. Using the standard waveform composition method for 2+2 dynamic drive
schemes results in the dependence of image contrast on image data-content. In this paper,
an implementation of this standard method with doubling the frequency of driving
signals is proposed. It allows to equalize the effective selection time for all display’s
pixels independently of preceding and following non-selected pixel voltage waveforms.
Thus, data-pattern-dependent defects at the passive-matrix addressing of cholesteric
liquid crystal displays are fully eliminated.
Keywords: bistable display, cholesteric liquid crystal, dynamic drive scheme.
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