| 摘要 |
<p>A display device comprising a flat or slightly hollow cell in which a thin layer of liquid crystals with negative dielectric anisotropy is interposed in a sandwich-like fashion between two transparent supporting layers made of glass or plastics whose faces, on the side of the liquid crystals, are rendered electrically conducting and are covered by a layer of a polymer having special characteristics, with a highly fractured surface divided into islands. In the absence of an electrical field, the liquid crystals are aligned, in a uniformly homeotropic manner, at right angles to the surfaces of the supporting layers polymeric coating and the cell is in a highly transparent state which is almost entirely independent of the viewing angle. By applying, through the conducting layers, an electrical field which is constant or variable over time with suitable frequencies and intensities, in the liquid crystals a division into microdomains with different orientation directions is obtained which produces a highly opaque state in the cell for visible light.</p> |
