Patent ID: 7859638
Filing Date: 2010-12-28
Classification: G02F

Abstract:
1. A method for driving a liquid crystal light modulating device comprising: preparing a liquid crystal light modulating device comprising: transparent electrodes which each have a horizontally alignment film and face each other to have a cell gap having a width of 10 μm or less therebetween; and a liquid crystal composition which is filled into the cell gap, wherein said liquid crystal composition comprises at least a chiral dopant, a dichroic dye, and a host liquid crystal, the content by percentage of the chiral dopant with respect to the total of the liquid crystal composition being defined by the following formula: in which C represents the content by percentage of the chiral dopant, n represents the average refractive index of the liquid crystal, and HTP represents the HTP value (unit: μm −1 ) of the chiral dopant, and wherein said liquid crystal composition has a positive dielectric constant anisotropy; and (a) applying a higher voltage than the threshold voltage of the liquid crystal composition into the liquid crystal light modulating device so as to be transparent and colorless, (b) applying a lower voltage than a threshold voltage of the liquid crystal composition into the liquid crystal light modulating device so as to be light-scattered white, or (c) applying no voltage into the liquid crystal light modulating device so as to be colored, thereby attaining display-switching.