Abstract
In this paper we calculate the relative transmittance variation at grey level voltage with cell gap variation, and the different surface anchoring strengths at both interface. The threshold voltage of an IPS mode LCD with weak anchoring strength was investigated by linear stability analysis; it was strongly dependent on the variation of cell gap. We analyse the transmittance variation at grey level voltage from the threshold behaviour of an IPS mode LCD with symmetric and asymmetric weak anchoring surface conditions. The ratio of relative transmittance variation of cells with weak anchoring and strong anchoring surfaces at the grey level voltage, Δ T weak grey / Δ T str grey, depends linearly on V weak c / V str c.
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