Active 3d shutter-glasses offering an improved level of image-brightness

Active 3d shutter-glasses for the viewing of time-multiplexed stereoscopic 3d images comprising a first lens and a second lens, with each of said lenses including at least one optical-shutter having a first substrate and a second substrate with cholesteric liquid crystal material being bound in-between said first and second substrates;

• said at least one optical shutter further including a first electrode on an inner-surface of said first substrate and a second electrode on an inner-surface of said second substrate, wherein said first electrode is patterned to form a plurality of mutually parallel electrode-lines, with all odd-numbered electrode-lines being electrically connected together in parallel to form a first electrode-patterning, and with all even-numbered electrode-lines being electrically connected together in parallel to form a second electrode-patterning;
• wherein the active 3d shutter glasses are configured to receive a first externally generated voltage-signal with a magnitude exceeding a threshold-voltage for said cholesteric liquid crystal material applied between said first electrode and said second electrode in order to generate an electrical-field within said cholesteric liquid crystal material with an electrical-field vector being aligned substantially perpendicular to the inner surfaces of said substrates in order to switch said cholesteric liquid crystal material to a homeotropic texture corresponding to a first optical state possessing a high level of optical transmission;
• wherein the active 3d shutter glasses are further configured to receive a second externally generated voltage-signal being applied between said first electrode-patterning and said second electrode-patterning of said first electrode in order to generate an in-plane electrical-field within said cholesteric liquid crystal material with an electrical-field vector being aligned substantially parallel with the inner surfaces of said substrates in order to provide for a voltage-assisted relaxation switching step when said cholesteric liquid crystal material switch from said homeotropic texture to the focal-conic texture corresponding to a second optical state thereof, and with said second optical state possessing a relatively low level of optical transmission;
• and
• wherein each said optical-shutter is configured to be modulated between said first and second optical states in synchronization with images generated by an external display system in order to generate a time-multiplexed three dimensional (3d) image.