Patent ID: 7463228
Filing Date: 2008-12-09
Classification: G02F

Abstract:
1. A method for fast switching a dual frequency liquid crystal cell, comprising: providing a liquid crystal cell, wherein said cell has opposed substrates with dual frequency liquid crystal material disposed therebetween, each said substrate associated with at least one electrode that is connected to a power supply able to apply different voltage magnitudes at different frequencies and each said substrate having an alignment layer to impart a high pretilt angle to the liquid crystal material, wherein no application of voltage results in the material exhibiting an initial state; applying a transition driving pulse of a first magnitude to the material at a first range of frequencies to accelerate a transition into a first state from the initial state; applying a holding pulse of a second magnitude to the material at said first range of frequencies to maintain said first state, wherein said second magnitude is less than said first magnitude; applying a transition driving pulse of a third magnitude to the material at a second range of frequencies to accelerate a transition into a second state from said first state; and applying a holding pulse of a fourth magnitude to the material at said second range of frequencies to maintain said second state, wherein said fourth magnitude is less than said third magnitude.