LIQUID CRYSTAL DIMMING DEVICE AND LIQUID CRYSTAL DIMMING METHOD
FIG5 is a diagram illustrating the relationship between a voltage applied to the liquid crystal panel related to a second operation example of the embodiment and a transmittance of the liquid crystal panel  FIG6 is a diagram illustrating the relationship between a voltage applied for each drive frequency to a reverse mode liquid crystal panel according to the embodiment and a transmittance of the liquid crystal panel
FIG5 is a diagram illustrating the relationship between the voltage applied to the liquid crystal panel serving as a load and the transmittance of the liquid crystal panel, in the control section 20. If the same figure is explained assuming that the applied voltage is controlled in the units of 1 [V], the frequency of a rectangular wave at a voltage of 0 (zero) [V] to 30 [V] applied to the liquid crystal panel is set to 60 [Hz], and the frequency of a rectangular wave at a voltage of 31 [V] to 50 [V] is set to 30 [Hz].  FIG6 illustrates the relationship between the voltage applied to the liquid crystal panel for each drive frequency and the transmittance of the liquid crystal panel, which is the basis of the control contents when the liquid crystal panel in the reverse mode is driven and controlled using the control section 20 in this embodiment.
diagram
10
window glass
20
control section
40
about
['1. A liquid crystal optical modulation device that performs light control drive of a liquid crystal panel, the device comprising: an optical modulation control section that switches and sets a frequency of a drive voltage in the form of a rectangular wave applied to the liquid crystal panel in accordance with a range of the drive voltage.']