Dual-frequency, dielectric anisotropy liquid crystal display

A liquid crystal apparatus, comprising:

• a first substrate and a second substrate in opposing relation and forming a predetermined space between one another;
• at least one first electrode formed on an inner surface of said first substrate;
• at least one second electrode formed on an inner surface of said second substrate to oppose said first electrode;
• a layer of liquid crystal composition having a molecular axis and interposed between said first electrode and said second electrode, said composition including a nematic liquid crystal material capable of use in a two-frequency addressing scheme for selectively inducing a dielectric scattering phenomenon is said composition, wherein a positive dielectric anisotropy is exhibited by said composition in response to an electric field at a frequency lower than a crossover frequency at which the dielectric anisotropy becomes nil, and a negative dielectric anisotropy is exhibited by said composition in response to an electric field at a frequency higher than said crossover frequency;
• a seal member associated with said substrates for sealing said layer of liquid crystal composition in said predetermined space;
• and
• means for selectively applying one of a high-frequency electric field and a low-frequency electric field to said layer of liquid crystal composition through said first and said second electrodes, and for applying to said first and said second electrodes a signal having a frequency lower than said crossover frequency to align the molecular axis of said liquid crystal composition with a line perpendicular to said first and said second substrates, and a signal having a frequency of at least 185 KHz to align said molecular axis with a line parallel to said first and said second substrates.