Patent ID: 7106318

Claim:
A circuit for driving a liquid crystal display, said display comprising an array of elongated row and an array of elongated column electrodes arranged transverse to the row electrodes, wherein overlapping areas of the two arrays of electrodes define pixels of the display when viewed in a viewing direction, said apparatus comprising: a control device; and at least one energy storage device supplying electrical potentials and energy to the row and column electrodes according to periodic addressing cycles of the liquid crystal display, causing the display to display desired images, wherein the control device causes the at least one energy storage device to be charged in a first phase, and causes substantially all of the energy consumed by the row or column electrode(s) to be supplied by the at least one energy storage device in a later second phase, wherein the at least one energy storage device generates electrical potentials and energy for application to the row and column electrodes during the second phase, wherein timing of the generation is in a predetermined timing relationship to the addressing cycles; said circuit comprising two energy storage devices each having two terminals, wherein the control device causes the two energy storage devices to be connected in parallel to at least one of a plurality of power sources during the first phase to charge the energy storage devices, so that they are charged to substantially the same voltage across their terminals, wherein during the second phase the control device causes the two energy storage devices to supply a first electrical potential to the row electrodes, and a first one of the two energy storage devices to supply to the column electrodes a second electrical potential below the first electrical potential by an amount and a second one of the two energy storage devices to supply to the column electrodes a third electrical potential above the first electrical potential by substantially the amount.