Optical signal polarization controller for vehicle, has electric field application unit with two three-dimensional electrodes to modify birefringence and/or orientation of optical axis based on field applied to liquid crystal cell

摘要

The controller (20) has a liquid crystal cell with two parallel substrate plates with an electro-optical composite material of liquid crystal. An electrical field application unit applies an electrical field perpendicular to a part of content of the cell. The application unit has a pair of massive three-dimensional electrodes arranged in such a manner to modify birefringence and/or orientation of an optical axis, according to the electrical field.