Patent ID: 8194020

Claim:
A liquid crystal display device, in which a multi-grayscale level state is produced in a liquid crystal layer by applying a different voltage thereto, comprising: a liquid crystal display panel having the liquid crystal layer between first and second electrodes; an electrode drive circuit, being supplied with multi-voltage power sources, and applying drive voltage pulses generated from the multi-voltage power sources to the first and the second electrodes; and a multi-voltage power generator circuit supplying the multi-voltage power sources to the electrode drive circuit, wherein the multi-voltage power generator circuit includes a first multi-voltage power unit generating first multi-voltage power sources with first stability and having a first consumption current, and a second multi-voltage power unit generating second multi-voltage power sources with second stability higher than the first stability, and having a second consumption current higher than the first consumption current, and the liquid crystal display device further comprising: a multi-voltage power switch circuit supplying the first or the second multi-voltage power sources from the first or the second multi-voltage power units to the electrode drive circuit; and a control circuit, in a first drive step, setting the first multi-voltage power unit to an active state and switching the multi-voltage power switch circuit to a supplying state of the first multi-voltage power sources, and, in a second drive step, setting the second multi-voltage power unit to the active state and switching the multi-voltage power switch circuit to a supplying state of the second multi-voltage power sources, wherein the first drive step includes a one-time binary drive phase for applying, to the first and the second electrodes, a first drive voltage pulse to set the liquid crystal layer to first and second grayscale levels, the second drive step includes a plurality of times of multilevel drive phases for applying, to the first and the second electrodes, a second drive voltage pulse to set the liquid crystal layer, having been set to the first grayscale level, to a plurality of third grayscale levels.