| 摘要 |
The molecular alignment in display regions 33 of a dichroic gust- host liquid crystal display cell 25-34 differs from that in other regions such that in the unsuited state regions 33 absorb light linearly polarised in a direction a as transmitted by an adjacent polariser 24 of constrast with other areas of the cell. The liquid crystal (nematic, but may contain optically active material) has positive dielectric anisotropy so that a field E between associated electrodes 29, 30 destroys the contrast; permanent display areas may have no electrodes, and further display regions may be such as to require activation to produce contrast. In both embodiments, areas of the cell plate 25 adjacent the polariser corresponding to regions 33 produce parallel homogeneous alignment extending parallel to direction a. In all other areas plates 25 and 26 both produce parallel homogeneous alignment extending at 90 DEG to direction a (regions 33 have a twist structure, as shown), or both produce homotropic alignment. <IMAGE> |
