| 摘要 |
<p>PURPOSE:To recover the display function even when the liquid crystal electrooptic device is exposed to low temperature, then the temperature rises by constituting the liquid crystal electrooptic device by using ferroelectric liquid crystal having a crystal layer which does not decrease in smectic layer interval in a crystal phase. CONSTITUTION:The ferroelectric liquid crystal material 6 is charged hermetically between two electrode substrates 1 and 2 which are arranged at an interval of 2-10mum in parallel to each other. A liquid crystal cell is heated into an anisotropic liquid phase, then cooled on the whole gradually at a speed of 0.1-1.0 deg.C per minute into a chiral smectic C phase. Consequently, liquid crystal molecules are oriented as shown in a figure (b) and the layer direction of the smectic phase 20 crosses the liquid crystal molecules 10 almost at right angles. In such a state, an electric field is applied from the top side of the paper surface to the reverse side and then the liquid molecules tilt to the left at a tilt angle theta as shown in a figure (a). When, the electric field is applied from the reverse surface of the paper surface, the liquid crystal molecules are reoriented as shown in a figure (c). Thus, liquid crystal cells are sandwiched between a 102-directional polarizing plate and an orthogonal polarizing plate, so that a figure (b) shows a drak display and figures (a) and (c) show bright displays.</p> |
