Sampling and level shifting apparatus to operate in conjunction with a liquid crystal display for converting DC analog drive signals to AC signals

Apparatus for use with a liquid crystal display which provides alternating current driving signals thereto derived from direct current analog signals, said apparatus comprising:

• first means for sampling and storing said applied analog signals in response to first predetermined control signals applied thereto;
• second means coupled to said first means for transferring said stored analog signals in response to second predetermined control signals;
• third means coupled to said second means for level shifting said analog signals applied thereto into a first predetermined range associated with said liquid crystal display during a first field time;
• and
• fourth means coupled to said second means for level shifting said analog signals applied thereto into a second predetermined range associated with said liquid crystal display, said first and second ranges being symmetrically disposed about a predetermined reference level of said liquid crystal display, said level shifted signals in said second range being of opposite polarity from said level shifted signals of said first range.