| 摘要 |
PURPOSE:To prevent a decrease in the contrast ratio of a liquid crystal by a temp. change of an electrooptic device provided with two sheets of polarizing plates on the outside of a cell by providing a means for changing the relative angle of the cell and the polarizing plates to said device. CONSTITUTION:The polarizing plate 12 provided with a fulcrum 11 is mounted atop the cell 10 for, for example, a liquid crystal shutter. The other end is fixed via a spiral bimetals 13 to a frame of the electrooptic device. The device is so constituted that the side mounted to the fulcrum 11 is rotated about 3 deg. according to a change in the temp. of the metal 13 from 45 deg.C to 60 deg.C to align the direction P of the axis of polarization of the plate 12 to one stable state of the liquid crystal molecules at 45 deg.C. The polarizing plate 15 is stuck to the rear face of the cell 10 in such a manner that the axis A of polarization intersects orthogonally with the direction P. The change in the quantity of leak light in an off state is decreased by deviating the plate 12 from the state of crossed nicols. The change in the contrast ratio is, therefore, decreased. |
