| 摘要 |
PURPOSE:To obtain a stereoscopic television set having uniform stereoscopic spectacles with excellent light transmissivity substantially and excellent response characteristics by combining a torsional nematic liquid crystal and a polarized plate to use them as an optical shutter. CONSTITUTION:In the optical shutter, polarized plates 21a, 21b are arranged relatively so that the polarized axes are orthogonal, transparent glass substrates 22a, 22b are arranged in parallel to the opposite face, flat transparent electrodes 23a, 23b are stuck by vapor-deposition or sputtering and the torsional nematic liquid crystal 24 is sealed between the electrodes 23a and 23b. In applying an AC voltage having a frequency lower than a frequency f9 between the transparent electrodes 23a and 23b, the liquid crystal molecule 24 is oriented while being twisted by 90 deg., the polarized plane of the incident light 20 is rotated by 90 deg., the light is transmitted through the plate 21b, and the optical shutter is in the opened state. In increasing the frequency of the applied AC voltage than the frequency f9, the liquid crystal molecule 24 changes the arrangement in the electric field direction, the light does not transmit the polarized plate 21b and the optical shutter is closed. |
