DRIVING DEVICE OF DIMMING SHEET, DRIVING METHOD OF DIMMING SHEET AND DRIVING PROGRAM OF DIMMING SHEET

摘要

To provide a driving device of a dimming sheet, a driving method of a dimming sheet and a driving program of a dimming sheet, by which transmittance of a dimming sheet can be controlled in a multi-gradation mode.SOLUTION: A driving device of a dimming sheet 20 having a dimming layer 21 comprising a liquid crystal composition interposed between a pair of transparent electrode layers 22, 23 is provided: the driving device includes a control part 30 for controlling an ON period of a switch included in a full-bridge circuit 40 where a DC current is input, so as to apply voltage pulses with alternately inverted polarities to the pair of transparent electrode layers 22, 23 from the full-bridge circuit 40. The control part 30 controls transmittance of the dimming layer 21 to multi-gradation levels by varying a pulse width, as well as charges in the dimming layer 21 to be discharged immediately after an application period of each voltage pulse elapses.SELECTED DRAWING: Figure 1