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As this slide explains, square waves are used to generate the different signals for row and column outputs. The number of levels can be optimized for each multiplex rate. Vop is the peak-to-peak voltage of the signals and Vth is the threshold voltage (a physical parameter of the liquid crystal). Vop can now be calculated for a needed multiplex rate. With lower temperatures the viscosity of the liquid crystals increases, this means the Vop must be enlarged to achieve identical twist of the molecules.
PTM Published on: 2011-11-02
India