Time-dependent color simulation of active-matrix liquid crystal display adopting the field sequential driving method

Abstract

A time-dependent display color simulation method is proposed. For the time-dependent simulation, we applied our behavioral model of liquid crystals (LC). The model provides the transient response characteristics of the LC. The color simulation of a twisted nematic active matrix liquid crystal display (AMLCD) adopting a field sequential (FS) driving method is possible when combining the transient LC responses with periodically operating red-greenblue (RGB) light emitting diodes (LEDs). By modifying the gate start pulse of the conventional AMLCD, we created a virtual AMLCD driven by the FS method. The color performance of the panel was measured at five vertical positions, and the results showed that the RGB LEDs should be driven by a 70% duty parameter and a 50% shifting parameter to minimize line-to-line color characteristic deviations in the AMLCD panel. By using the proposed simulation method, it is possible to find the optimal FS driving condition for any display with arbitrary response characteristics to exhibit the best color performance.