DRIVING DEVICE FOR LIQUID CRYSTAL OPTICAL DEVICE

摘要

PURPOSE:To obtain a good shutter characteristic even with liquid crystal optical elements having different cell thicknesses by changing the period when the electric field of the frequency higher than a cross frequency among the electric fields to be impressed to a liquid crystal is impressed according to the layer thickness of the liquid crystal sealed between a pair of the substrates. CONSTITUTION:The liquid crystal for 2-frequency driving having the dielectric anisotropy to be inverted in positive and negative polarities with the cross frequency where the dielectric anisotropy is '0' as a boundary is sealed between a pair of the opposed substrates and the period when the electric field fH of the frequency higher than the cross frequency among the electric fields to be impressed to the liquid crystal is impressed is changed according to the layer thickness of the liquid crystal sealed between a pair of the substrates. For example, a selection circuit 48 selects the clock signal from a timing clock signal generating circuit 45 by the command from an fH period setting part 49 and outputs the same as an fH impression signal to an ON/OFF signal generting circuit 46 and a common signal generating circuit 47. The setting part 49 operates a setting switch according to the thickness of the liquid crystal cell.